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The File Transfer Protocol (FTP) profile enables you to transfer
files between a client and server, using FTP connections over TCP. The FTP application layer
gateway (ALG) supports the FTP protocol’s active and passive modes, where data connections are
initiated either from an FTP server (active mode) or from a client (passive mode).

You can configure the FTP profile settings, as needed, to ensure compatibility between IPv4 and
IPv6 clients and servers, to enable the FTP data channel to inherit the TCP profile used by the
FTP control channel, and to use a port other than the default port (20).
Additionally, when used with Application Security Manager™ (ASM™), this profile enables the BIG-IP^® system to inspect FTP traffic
for security vulnerabilities by using an FTP security profile.

The carrier-grade NAT (CGNAT) module must be enabled with the appropriate settings before you can create large-scale NAT (LSN) pools.

LSN pools are used by the CGNAT module to allow efficient configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. In the Configuration area, for the Persistence Mode
   setting, select Address or Address
   Port.

5. For the Member List setting, type an address and a
   prefix length in the Address/Prefix Length field, and
   click Add.

   If your pool uses deterministic mode, ensure that any address ranges you enter
   as a member do not overlap another member’s prefix address ranges. For example,
   the address and prefix 10.10.10.0/24 overlaps
   10.10.10.0/23.

6. Click Finished.

You can configure a file transfer protocol (FTP) profile on the BIG-IP^® system that transfers files, either in an active or passive mode, and
logs related messages.

1. On the Main tab, click .

   The FTP screen opens and displays a list of available FTP ALG
   profiles.

2. Click Create.

3. Type a name for the profile.

4. From the Parent Profile list, select a parent
   profile.

5. Select the Custom check box.

6. Select the Translate Extended check box to ensure
   compatibility between IPv4 and IPv6 clients and servers when using the FTP
   protocol. The default is selected.

7. Select the Inherit Parent Profile check box to enable
   the FTP data channel to inherit the TCP profile used by the control channel. The
   check box is clear by default.

   Note: If disabled,
   the data channel uses FastL4 (BigProto) only.

8. In the Data Port field, type a number for an alternate
   port. The default value for the FTP data port is 20.
   

9. Click Finished.

An FTP profile is configured on the BIG-IP^® system that transfers files, either in an active or passive mode, and
logs related messages.

You create iRules^® to automate traffic forwarding for XML
content-based routing. When a match occurs, an iRule event is triggered, and the iRule
directs the individual request to an LSN pool, a node, or virtual server.

1. On the Main tab, click .

   The iRule List screen opens.

2. Click Create.

3. In the Name field, type a 1 to 31 character name, such
   as cgn_https_redirect_iRule.

4. In the Definition field, type the syntax for the iRule
   using Tool Command Language (Tcl) syntax.

   For complete and detailed information about iRules syntax, see the F5 Networks
   DevCentral web site (http://devcentral.f5.com).

5. Click Finished.

You now have an iRule to use with a CGNAT virtual server.

Virtual servers are matched based on source (client) addresses. Define a virtual
server in order to reference an FTP profile and LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. In the Destination Address field, type the IP address in
   CIDR format.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 10.0.0.1 or
   10.0.0.0/24, and an IPv6 address/prefix is
   ffe1::0020/64 or
   2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4
   address without specifying a prefix, the BIG-IP^® system
   automatically uses a /32 prefix.

   Note: The IP
   address you type must be available and not in the loopback
   network.

6. In the Service Port field, type
   21 or select FTP from the
   list.

7. From the Protocol list, select
   TCP.

8. From the Protocol Profile (Client) list, select a
   predefined or user-defined TCP profile.

9. From the Protocol Profile (Server) list, select a
   predefined or user-defined TCP profile.

10. From the FTP Profile list, select an FTP ALG profile for
    the virtual server to use.

11. For the LSN Pool setting, select the pool that this
    server will draw on for addresses.

12. Locate the Resources area of the screen; for the Related
    iRules setting, from the Available list,
    select the name of the iRule that you want to assign and move the name to the
    Enabled list.

    This setting applies to virtual servers that reference a profile for a data
    channel protocol, such as FTP or RTSP.

13. Click Finished.

The custom CGNAT virtual server appears in the CGNAT Virtual Servers list.

You can create an application layer gateway (ALG) logging profile, and associate it
with one or more FTP ALG profiles, to allow you to configure logging options for various
events that apply to high-speed logging (HSL) destinations. A logging profile decreases
the need to maintain a number of customized profiles where the events are very
similar.

1. On the Main tab, click .

   The ALG logging profiles screen opens.

2. Click Create.

   The New ALG Logging Profile screen opens.

3. In the Name field, type a unique name for the logging
   profile.

4. From the Parent Profile list, select a profile from
   which the new profile inherits properties.

5. For the Log Settings area, select the Custom check box.
   

6. For the Log Settings area, select Enabled for the
   following settings, as necessary.

   Setting	Description
   Start Control Channel	Generates event log entries at the start of a control channel connection for an ALG client.
   End Control Channel	Generates event log entries at the end of a control channel connection for an ALG client.
   Start Data Channel	Generates event log entries at the start of a data channel connection for an ALG client.
   End Data Channel	Generates event log entries at the end of a data channel connection for an ALG client.
   Inbound Transaction	Generates event log entries of ALG messages triggered by an inbound connection to the BIG-IP® system.

7. Click Finished.

You can associate an FTP ALG profile with a log publisher and logging profile that
the BIG-IP^® system uses to send log messages to a specified
destination.

1. On the Main tab, click .

   The FTP screen opens and displays a list of available FTP ALG
   profiles.

2. Click the name of an FTP profile.

3. From the Logging Profile list, select the logging
   profile the BIG-IP system uses to configure logging options for various ALG
   events.

   Note: If you
   configure a Logging Profile, you must also configure a Log Publisher.

4. Click Finished.

The Session Initiation Protocol (SIP) profile establishes connections
over TCP, UDP, and SCTP through a CGNAT. It creates the connections by establishing flows for
multimedia traffic, and by translating IP addresses included in SIP messages into external IP
addresses. As a result, these can be reached by means of a public network. Once a call is
established, the SIP ALG creates flows for multimedia traffic (as determined by the advertised
address and port combinations on either side of a call), and tears down the flow when the call
ends.

In this example, an LSN pool is configured with a translation IP address and prefix length of
10.33.1.0/24. The virtual server is configured with a register and invite
port that use a wildcard destination address and a specific port:
0.0.0.0:560. The SIP RTP data port is configured to use port
886 and the RTCP data port is configured to use port
887. The configured translation mode uses the values of the respective
port range.

The carrier-grade NAT (CGNAT) module must be enabled with the appropriate settings before you can create large-scale NAT (LSN) pools.

LSN pools are used by the CGNAT module to allow efficient configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. In the Configuration area, for the Persistence Mode
   setting, select Address or Address
   Port.

5. For the Member List setting, type an address and a
   prefix length in the Address/Prefix Length field, and
   click Add.

   If your pool uses deterministic mode, ensure that any address ranges you enter
   as a member do not overlap another member’s prefix address ranges. For example,
   the address and prefix 10.10.10.0/24 overlaps
   10.10.10.0/23.

6. Click Finished.

You can configure a session initiation protocol (SIP) profile on the BIG-IP^® system that manages peer-to-peer connections through a CGNAT.

1. On the Main tab, click .

   The SIP screen opens and displays a list of available SIP ALG
   profiles.

2. Click Create.

3. Type a name for the profile.

4. From the Parent Profile list, select a parent
   profile.

5. Select the Custom check box.

6. In the Maximum Size (Bytes) field, type a number to
   specify the maximum size, in bytes, for a SIP message. The default is
   65535 bytes.

7. Clear the Terminate on BYE check box.

   Important: You must
   clear the Terminate on BYE check box for a TCP or UDP
   connection when the BIG-IP system functions as a SIP proxy, configuring the
   inbound SNAT and consolidating multiple calls into one server-side
   connection. You should select the Terminate on BYE
   check box to improve performance only for a UDP connection if each client
   call comes from a unique IP address and no inbound SNATs are
   configured.

8. Select the Dialog Aware check box to gather SIP dialog
   information, and automatically forward SIP messages belonging to the known SIP
   dialog. The default is cleared.

9. Select the Security check box to enable the use of
   enhanced HSL security checking. The default is cleared.

10. With the Dialog Aware check box selected, in the
    Community field, type a string to indicate whether
    the SIP virtual server-profile pair belongs to the same SIP proxy functional
    group.

11. Configure the Insert Via Header settings.

    1. From the Insert Via Header list, select
       Enabled to insert a Via header in the
       forwarded SIP request. The default is
       Disabled.

    2. With the Insert Via Header setting enabled, in
       the User Via field type a value that the system
       inserts as the top Via header in a SIP REQUEST
       message.

12. Select the Secure Via Header check box to insert a
    secure Via header in the forwarded SIP request. The default is cleared.

13. Select the Insert Record-Route Header check box to
    insert a Record-Route SIP header, which indicates the next hop for the following
    SIP request messages. The default is cleared.

14. Configure the Application Level Gateway settings.

    1. From the Application Level Gateway list, select
       Enabled to provide options for defining ALG
       settings. The default is Disabled.

    2. From the RTP Proxy Style list, select
       Symmetric.

    3. In the Dialog Establishment Timeout field, type
       an interval, in seconds, during which the system attempts to establish a
       peer-to-peer SIP relationship between two user agents, which facilitates
       sequencing of messages and proper routing of requests between two user
       agents. The default is 10.

    4. In the Registration Timeout field, type a time,
       in seconds, that elapses before the SIP registration process expires.
       The default is 3600.

       Note: When configuring a SIP profile for use with Port Block Allocation (PBA), the
       Registration Timeout value must be less
       than the PBA Block Lifetime value.

    5. In the SIP Session Timeout field, type an idle
       time, in seconds, after which the SIP session times out. The default is
       300.

    6. In the Maximum Media Sessions field, type a
       maximum number of allowable sessions. The default is
       6.

    7. In the Maximum Sessions Per Registration field,
       type a maximum number of allowable sessions per registration. The
       default is 50.

    8. In the Maximum Registrations field, type a
       maximum number of allowable registrations. The default is
       100.

15. Select the SIP Firewall check box to indicate that SIP
    firewall capability is enabled. The default is cleared.

16. Click Finished.

A SIP profile is configured on the BIG-IP^® system that manages peer-to-peer connections through a CGNAT.

Virtual servers are matched based on source (client) addresses. Here are the steps
to define a virtual server that references a SIP profile and LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. For a network, in the Destination Address field, type an
   IPv4 or IPv6 address in CIDR format to allow all traffic to be translated.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 0.0.0.0/0, and an
   IPv6 address/prefix is ::/0.

6. In the Service Port field, type
   5060.

7. From the Configuration list, select
   Advanced.

8. From the Protocol list, select one of the
   following:

   • UDP

   • TCP

   • *All Protocols

9. From the Protocol Profile (Client) list, select a
   predefined or user-defined profile.

10. From the Protocol Profile (Server) list, select a
    predefined or user-defined profile.

11. From the SIP Profile list, select a SIP ALG profile for
    the virtual server to use.

12. For the LSN Pool setting, select the LSN pool that this
    server uses for addresses.

13. From the Source Port list, select
    Change.

14. Click Finished.

The custom CGNAT virtual server appears in the CGNAT Virtual Servers list.

The CGNAT module must be enabled through the screen before you can create LSN pools.

Large Scale NAT (LSN) pools are used by the CGNAT module to allow efficient
configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. From Persistence Mode, select to persist on
   Address Port.

   This is the address mode the CGNAT module uses to track and store connection
   data.

5. From the Log Publisher list, select the log publisher
   the BIG-IP system uses to send log messages to a specified destination.

   Important: If you
   configure a log publisher to use multiple logging destinations, then, by
   default, all logging destinations must be available in order to log to each
   destination. Unless all logging destinations are available, no logging can
   occur. If you want to log to the available logging destinations when one or
   more destinations become unavailable, you must set the
   logpublisher.atomic db variable to false.

6. Click Finished.

Your empty LSN pool is now ready.

Virtual servers are matched based on source (client) addresses. Here are the steps
to define a virtual server that references a SIP profile and LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. In the Source field, type
   0.0.0.0/0.

6. For a host, in the Destination Address field, type an
   IPv4 or IPv6 address in CIDR format to allow all traffic to be translated.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 0.0.0.0/0, and an
   IPv6 address/prefix is ::/0.

7. In the Service Port field, type the port number
   5060 for the service.

8. From the Configuration list, select
   Advanced.

9. From the Protocol list, select one of the
   following:

   • UDP

   • TCP

   • *All Protocols

10. From the Protocol Profile (Client) list, select a
    predefined or user-defined profile.

11. From the Protocol Profile (Server) list, select a
    predefined or user-defined profile.

12. From the SIP Profile list, select the same SIP ALG
    profile for this virtual server to use as the other virtual server.

13. For the LSN Pool setting, select the empty pool that
    this server will use for addresses.

14. Click Finished.

The custom CGNAT virtual server appears in the CGNAT Virtual Servers list.

You can create an ALG logging profile, and associate it with one or more SIP ALG profiles, to allow you to configure logging
options for various events that apply to high-speed logging (HSL) destinations. A logging profile decreases the need to maintain a number of
customized profiles where the events are very similar.

1. On the Main tab, click .

   The ALG logging profiles screen opens.

2. Click Create.

   The New ALG Logging Profile screen opens.

3. In the Name field, type a unique name for the logging
   profile.

4. From the Parent Profile list, select a profile from
   which the new profile inherits properties.

5. For the Log Settings area, select the Custom check box.
   

6. For the Log Settings area, select Enabled for the
   following settings, as necessary.

   Setting	Description
   Start Control Channel	Generates event log entries at the start of a control channel connection for an ALG client.
   End Control Channel	Generates event log entries at the end of a control channel connection for an ALG client.
   Start Data Channel	Generates event log entries at the start of a data channel connection for an ALG client.
   End Data Channel	Generates event log entries at the end of a data channel connection for an ALG client.
   Inbound Transaction	Generates event log entries of ALG messages triggered by an inbound connection to the BIG-IP® system.

7. Click Finished.

You can associate an SIP ALG profile with a log publisher and logging profile that
the BIG-IP^® system uses to send log messages to a specified
destination.

1. On the Main tab, click .

   The SIP screen opens and displays a list of available SIP ALG
   profiles.

2. Click the name of an SIP profile.

3. From the Logging Profile list, select the logging
   profile the BIG-IP system uses to configure logging options for various ALG
   events.

   Note: If you
   configure a Logging Profile, you must also configure a Log Publisher.

4. Click Finished.

The Real Time Streaming Protocol (RTSP) profile enables you to stream multimedia
content between a client and server, using RTSP connections over TCP. The RTSP application layer
group (ALG) supports the RTSP protocol’s control channel to an RTSP server, through which the
client requests a file for the server to stream (and controls the streaming of that file with
commands like play or pause). The client can request streaming over UDP and provide two listening
ports for the server response. The RTSP server responds with a Real-Time Transport Protocol (RTP)
data channel port, to stream the requested file, and a Real-Time Control Protocol (RTCP) control
channel port, which provides a stream description and status.

Note: You can specify RTP and RTCP port numbers in the RTSP profile, which only apply
when a client connects to a Windows Media server. If you configure RTP and RTCP port numbers,
both values must be nonzero.

You can configure the RTSP profile settings, as needed.

In this example, an LSN pool is configured with a translation IP address and prefix length of
10.33.1.0/24. The virtual server is configured with an RTSP control port
using a wildcard address and a specific port: 0.0.0.0:554. The configured
translation mode uses the values of the respective port range.

The carrier-grade NAT (CGNAT) module must be enabled with the appropriate settings before you can create large-scale NAT (LSN) pools.

LSN pools are used by the CGNAT module to allow efficient configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. In the Configuration area, for the Persistence Mode
   setting, select Address or Address
   Port.

5. For the Member List setting, type an address and a
   prefix length in the Address/Prefix Length field, and
   click Add.

   If your pool uses deterministic mode, ensure that any address ranges you enter
   as a member do not overlap another member’s prefix address ranges. For example,
   the address and prefix 10.10.10.0/24 overlaps
   10.10.10.0/23.

6. Click Finished.

You can configure a real time streaming protocol (RTSP) profile on the BIG-IP^® system that streams multimedia content between a client and
server.

1. On the Main tab, click .

   The RTSP screen opens and displays a list of available RTSP ALG
   profiles.

2. Click Create.

3. Type a name for the profile.

4. From the Parent Profile list, select a parent
   profile.

5. Select the Custom check box.

6. In the RTP Port field, type the port number that a
   Microsoft Media Services server uses. The default is
   0.

   Note: You can specify
   Real-Time Transport Protocol (RTP) and Real-Time Control Protocol (RTCP)
   port numbers in the RTSP profile, which only apply when a client connects to
   a Windows
   Media^® server. If you configure RTP and RTCP port numbers, both
   values must be nonzero.

7. In the RTCP Port field, type the port number that a
   Microsoft Media Services server uses. The default is
   0.

   Note: You can specify
   Real-Time Transport Protocol (RTP) and Real-Time Control Protocol (RTCP)
   port numbers in the RTSP profile, which only apply when a client connects to
   a Windows
   Media^® server. If you configure RTP and RTCP port numbers, both
   values must be nonzero.

8. Click Finished.

An RTSP profile is configured on the BIG-IP^® system that
streams multimedia content between a client and server.

You create iRules^® to automate traffic forwarding for XML
content-based routing. When a match occurs, an iRule event is triggered, and the iRule
directs the individual request to an LSN pool, a node, or virtual server.

1. On the Main tab, click .

   The iRule List screen opens.

2. Click Create.

3. In the Name field, type a 1 to 31 character name, such
   as cgn_https_redirect_iRule.

4. In the Definition field, type the syntax for the iRule
   using Tool Command Language (Tcl) syntax.

   For complete and detailed information about iRules syntax, see the F5 Networks
   DevCentral web site (http://devcentral.f5.com).

5. Click Finished.

You now have an iRule to use with a CGNAT virtual server.

Virtual servers are matched based on source (client) addresses. Here are the steps
to define a virtual server that references an RTSP profile and LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. In the Destination Address field, type the IP address in
   CIDR format.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 10.0.0.1 or
   10.0.0.0/24, and an IPv6 address/prefix is
   ffe1::0020/64 or
   2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4
   address without specifying a prefix, the BIG-IP^® system
   automatically uses a /32 prefix.

   Note: The IP
   address you type must be available and not in the loopback
   network.

6. In the Service Port field, type
   554 for the service.

7. From the Protocol list, select
   TCP.

8. From the Protocol Profile (Client) list, select a
   predefined or user-defined TCP profile.

9. From the Protocol Profile (Server) list, select a
   predefined or user-defined TCP profile.

10. From the RTSP Profile list, select an RISP ALG profile
    for the virtual server to use.

11. For the LSN Pool setting, select the pool that this
    server will draw on for addresses.

12. Locate the Resources area of the screen; for the Related
    iRules setting, from the Available list,
    select the name of the iRule that you want to assign and move the name to the
    Enabled list.

    This setting applies to virtual servers that reference a profile for a data
    channel protocol, such as FTP or RTSP.

13. Click Finished.

The custom CGNAT virtual server appears in the CGNAT Virtual Servers list.

You can create an ALG logging profile, and associate it with one or more RTSP ALG profiles,
to allow you to configure logging options for various events that apply to high-speed logging (HSL) destinations. A logging profile decreases the need to maintain a number of customized profiles where the events are very similar.

1. On the Main tab, click .

   The ALG logging profiles screen opens.

2. Click Create.

   The New ALG Logging Profile screen opens.

3. In the Name field, type a unique name for the logging
   profile.

4. From the Parent Profile list, select a profile from
   which the new profile inherits properties.

5. For the Log Settings area, select the Custom check box.
   

6. For the Log Settings area, select Enabled for the
   following settings, as necessary.

   Setting	Description
   Start Control Channel	Generates event log entries at the start of a control channel connection for an ALG client.
   End Control Channel	Generates event log entries at the end of a control channel connection for an ALG client.
   Start Data Channel	Generates event log entries at the start of a data channel connection for an ALG client.
   End Data Channel	Generates event log entries at the end of a data channel connection for an ALG client.
   Inbound Transaction	Generates event log entries of ALG messages triggered by an inbound connection to the BIG-IP® system.

7. Click Finished.

You can associate an RTSP ALG profile with a log publisher and logging profile that
the BIG-IP^® system uses to send log messages to a specified
destination.

1. On the Main tab, click .

   The RTSP screen opens and displays a list of available RTSP ALG
   profiles.

2. Click the name of an RTSP profile.

3. From the Logging Profile list, select the logging
   profile the BIG-IP system uses to configure logging options for various ALG
   events.

   Note: If you
   configure a Logging Profile, you must also configure a Log Publisher.

4. Click Finished.

The point-to-point tunneling protocol (PPTP) profile enables you to configure the
BIG-IP^® system to support a secure virtual private network (VPN)
tunnel. A PPTP application layer gateway (ALG) forwards PPTP client (also known as PPTP Access
Concentrator [PAC]) control and data connections through the BIG-IP system to PPTP servers
(also known as PPTP Network Servers [PNSs]), while providing source address translation that
allows multiple clients to share a single translation address.

The PPTP profile defines a Transmission Control Protocol (TCP) control connection and a data
channel through a PPTP Generic Routing Encapsulation (GRE) tunnel, which manages the PPTP tunnels
through CGNAT for NAT44 and DS-Lite, as well as all translation modes, including Network Address
Port Translation (NAPT), Deterministic, and Port Block Allocation (PBA) modes.

This topic includes examples of the elements that comprise a typical log
entry.

"Mar 1 18:46:11:PPTP CALL-REQUEST id;0 from;10.10.10.1 to;20.20.20.1 nat;30.30.30.1 ext-id;32456"
"Mar 1 18:46:11:PPTP CALL-START id;0 from;10.10.10.1 to;20.20.20.1 nat;30.30.30.1 ext-id;32456"
"Mar 1 18:46:11:PPTP CALL-END id;0 reason;0 from;10.10.10.1 to;20.20.20.1 nat;30.30.30.1 ext-id;32456"      

The carrier-grade NAT (CGNAT) module must be enabled with the appropriate settings before you can create large-scale NAT (LSN) pools.

LSN pools are used by the CGNAT module to allow efficient configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. In the Configuration area, for the Persistence Mode
   setting, select Address or Address
   Port.

5. For the Member List setting, type an address and a
   prefix length in the Address/Prefix Length field, and
   click Add.

   If your pool uses deterministic mode, ensure that any address ranges you enter
   as a member do not overlap another member’s prefix address ranges. For example,
   the address and prefix 10.10.10.0/24 overlaps
   10.10.10.0/23.

6. Click Finished.

You can configure a point-to-point tunneling protocol (PPTP) profile on the BIG-IP^® system to support a secure virtual private network (VPN)
tunnel that forwards PPTP control and data connections, and logs related
messages.

1. On the Main tab, click .

   The PPTP screen opens and displays a list of available PPTP ALG
   profiles.

2. Click Create.

3. Type a name for the profile.

4. From the Parent Profile list, select a parent
   profile.

5. Select the Custom check box.

6. From the Publisher Name list, select a log publisher for
   high-speed logging of messages.

   If None is selected, the BIG-IP system uses the
   default syslog.

   Important: If you configure a log publisher to use multiple logging
   destinations, then, by default, all logging destinations must be available
   in order to log to each destination. Unless all logging destinations are
   available, no logging can occur. If you want to log to the available logging
   destinations when one or more destinations become unavailable, you must set
   the logpublisher.atomic db variable to false.

7. Optional:
   From the Include Destination IP list, select whether to
   include the PPTP server’s IP address in log messages.

   Option	Description
   Enabled	Includes the PPTP server’s IP address in log messages for call establishment or call disconnect.
   Disabled	Default. Includes 0.0.0.0 as the PPTP server’s IP address in log messages for call establishment or call disconnect.

8. Click Finished.

The PPTP profile displays in the ALG Profiles list on the PPTP screen.

Perform this task when you want to explicitly add a route for a destination client
that is not on the directly-connected network. Depending on the settings you choose,
the BIG-IP system can forward packets to a specified network device, or the system
can drop packets altogether.

1. On the Main tab, click .

2. Click Add.

   The New Route screen opens.

3. In the Name field, type a unique user name.

   This name can be any combination of alphanumeric characters, including an IP
   address.

4. Optional:
   In the Description field, type a
   description for this route entry.

5. In the Destination field, type the destination IP
   address for the route.

6. In the Netmask field, type the network mask for the
   destination IP address.

7. From the Resource list, specify the method through which
   the system forwards packets:

   Option	Description
   Use Gateway	Select this option when you want the next hop in the route to be a network IP address. This choice works well when the destination is a pool member on the same internal network as this gateway address.
   Use Pool	Select this option when you want the next hop in the route to be a pool of routers instead of a single next-hop router. If you select this option, verify that you have created a pool on the BIG-IP system, with the routers as pool members.
   Use VLAN/Tunnel	Select this option when you want the next hop in the route to be a VLAN or tunnel. This option works well when the destination address you specify in the routing entry is a network address. Selecting a VLAN/tunnel name as the resource implies that the specified network is directly connected to the BIG-IP system. In this case, the BIG-IP system can find the destination host simply by sending an ARP request to the hosts in the specified VLAN, thereby obtaining the destination host’s MAC address.
   Reject	Select this option when you want the BIG-IP system to reject packets sent to the specified destination.

8. In the MTU field, specify in bytes a maximum
   transmission unit (MTU) for this route.

9. Click Finished.

A static route is defined to manage GRE traffic to a client.

Be sure to disable translate-address and
translate-port before creating a PPTP virtual server.

Virtual servers are matched based on source (client) addresses. You define a
virtual server that references the CGNAT profile and the LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. For a network, in the Destination Address field, type an
   IPv4 or IPv6 address in CIDR format to allow all traffic to be translated.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 0.0.0.0/0, and an
   IPv6 address/prefix is ::/0.

6. In the Service Port field, type
   1723 or select PPTP from the
   list.

7. From the PPTP Profile list, select a PPTP ALG profile
   for the virtual server to use.

8. From the VLAN and Tunnel Traffic list, select
   Enabled on. Then, for the VLANs and
   Tunnels setting, move the VLAN or VLANs on which you want to
   allow the virtual servers to share traffic from the
   Available list to the Selected
   list.

9. For the LSN Pool setting, select the pool that this
   server will draw on for translation addresses.

10. Click Finished.

The custom CGNAT virtual server appears in the CGNAT Virtual Servers
list.

You can configure a Trivial File Transfer Protocol (TFTP) on the BIG-IP^® system to read and write files from or to a remote server.

1. On the Main tab, click .

   The TFTP screen opens and displays a list of available TFTP ALG
   profiles.

2. On the Main tab, click .

   The TFTP screen opens and displays a list of available TFTP ALG
   profiles.

3. Click Create.

   The New TFTP Profile screen opens.

4. In the Name field, type a unique name for the TFTP
   profile.

5. From the Parent Profile list, select a profile from
   which the new profile inherits properties.

6. For the Settings area, select the Custom check box.
   

7. In the Settings area, for the Idle Timeout list, type a
   number to specify the number of seconds after a connection is eligible for
   deletion; when the connection has no traffic. The default value is 30
   seconds.

8. For the Log Settings area, select the Custom check box.
   

9. From the Logging Profile list, select the logging
   profile the BIG-IP system uses to configure logging options for various ALG
   events.

   Note: If you
   configure a Logging Profile, you must also configure a Log Publisher.

10. Click Finished.

The carrier-grade NAT (CGNAT) module must be enabled with the appropriate settings before you can create large-scale NAT (LSN) pools.

LSN pools are used by the CGNAT module to allow efficient configuration of translation prefixes and parameters.

1. On the Main tab, click .

   The LSN Pool List screen opens.

2. Click Create.

3. In the Name field, type a unique name.

4. In the Configuration area, for the Persistence Mode
   setting, select Address or Address
   Port.

5. For the Member List setting, type an address and a
   prefix length in the Address/Prefix Length field, and
   click Add.

   If your pool uses deterministic mode, ensure that any address ranges you enter
   as a member do not overlap another member’s prefix address ranges. For example,
   the address and prefix 10.10.10.0/24 overlaps
   10.10.10.0/23.

6. Click Finished.

Virtual servers are matched based on source (client) addresses. Create and define a
virtual server that references an TFTP profile and LSN pool.

1. On the Main tab, click .

   The Virtual Server List screen opens.

2. Click the Create button.

   The New Virtual Server screen opens.

3. In the Name field, type a unique name for the virtual
   server.

4. From the Type list, retain the default setting
   Standard.

5. In the Destination Address field, type the IP address in
   CIDR format.

   The supported format is address/prefix, where the prefix length is in bits.
   For example, an IPv4 address/prefix is 10.0.0.1 or
   10.0.0.0/24, and an IPv6 address/prefix is
   ffe1::0020/64 or
   2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4
   address without specifying a prefix, the BIG-IP^® system
   automatically uses a /32 prefix.

6. In the Service Port field, type
   69 or select TFTP from the
   list.

7. From the Configuration list, select
   Advanced.

8. From the Protocol list, select
   UDP.

9. From the TFTP Profile list, select an TFTP ALG profile
   for the virtual server to use.

10. For the LSN Pool setting, select the pool that this
    server will draw on for addresses.

11. Click Finished.

You can create an application layer gateway (ALG) logging profile, and associate it
with one or more Trivial File Transfer Protocol (TFTP) ALG profiles, to allow you to
configure logging options for various events. A logging profile decreases the need to
maintain a number of customized profiles where the events are very similar.

1. On the Main tab, click .

   The ALG logging profiles screen opens.

2. Click Create.

   The New ALG Logging Profile screen opens.

3. In the Name field, type a unique name for the TFTP
   profile.

4. From the Parent Profile list, select a profile from
   which the new profile inherits properties.

5. For the Log Settings area, select the Custom check box.
   

6. For the Log Settings area, select Enabled for the
   following settings, as necessary.

   Setting	Description
   Start Control Channel	Generates event log entries at the start of a control channel connection for an ALG client.
   End Control Channel	Generates event log entries at the end of a control channel connection for an ALG client.
   Start Data Channel	Generates event log entries at the start of a data channel connection for an ALG client.
   End Data Channel	Generates event log entries at the end of a data channel connection for an ALG client.
   Inbound Transaction	Generates event log entries of ALG messages triggered by an inbound connection to the BIG-IP® system.

7. Click Finished.