Dns сервер для роутера huawei

If you want to use meaningful and easy-to-memorize domain names to access other devices, configure DNS. DNS entries record the mappings between domain names and IP addresses. In Figure 1-545, the DNS client and client program are on the same device.

• If you seldom use domain names to visit other devices or no DNS server is available, configure static DNS on the DNS client. To configure static DNS, you must know the mappings between domain names and IP addresses. If a mapping changes, you must manually modify the DNS entry on the DNS client.
• If you want to use domain names to visit many devices and DNS servers are available, configure dynamic DNS on the DNS client. Dynamic DNS requires DNS servers.

Figure 1-545 Networking diagram for typical domain name resolution

Before configuring DNS, complete the following tasks:

• Configuring a route between the DNS client and server, so that the DNS client and server can communicate

• Configuring DNS servers

Context

Procedure

1. After confirming the dynamic DNS entries to be deleted from the cache, run the reset dns dynamic-host [ vpn-instance vpn-name ] [ hostname ] command in the user view.

Context

In routine maintenance, you can run the following commands in all views to check the running status of DNS.

Procedure

• Run the display ip host [ vpn-instance vpn-name ] command to check information about the static domain name resolution table.
• Run the display dns server(IPv4) [ vpn-instance vpn-name ] command to check DNS server configurations.
• Run the display dns domain(IPv4) [ vpn-instance vpn-name ] command to check domain name suffixes.
• Run the display dns dynamic-host [ vpn-instance vpn-name ] command to check information about dynamic DNS entries in the cache.

Networking Requirements

As shown in Figure 1-546, Device A frequently uses the domain name «host.com» to visit the host. To improve the efficiency of domain name resolution, you can establish a static mapping between the domain name «host.com» and IP address 10.100.1.2 in the static domain name resolution table of Device A.

Configuration Roadmap

The configuration roadmap is as follows:

• Establish a static mapping between the domain name «host.com» and IP address 10.100.1.2 on Device A.

Data Preparation

To complete the configuration, you need the following data:

• IP addresses of Device A and the host

• Domain name of the host

Procedure

1. Configure a static mapping between the domain name «host.com» and IP address 10.100.1.2.

   <HUAWEI> system-view

   [~HUAWEI]sysname DeviceA

   [*HUAWEI]commit

   [~DeviceA] ip host host.com 10.100.1.2

   [*DeviceA] commit

2. Verify the configuration.

   # Run the ping host.com command on Device A. The host can be pinged. The destination IP address for the ping operation is 10.100.1.2.

   <DeviceA> ping host.com

     ping host.com (10.100.1.2):56 data bytes, press CTRL_C to break
        Reply from 10.100.1.2: bytes=56 Sequence=1 ttl=128 time=1 ms
        Reply from 10.100.1.2: bytes=56 Sequence=2 ttl=128 time=4 ms
        Reply from 10.100.1.2: bytes=56 Sequence=3 ttl=128 time=3 ms
        Reply from 10.100.1.2: bytes=56 Sequence=4 ttl=128 time=2 ms
        Reply from 10.100.1.2: bytes=56 Sequence=5 ttl=128 time=3 ms
   
       --- host.com ping statistics ---
        5 packet(s) transmitted
        5 packet(s) received
        0.00% packet loss
        round-trip min/avg/max = 1/2/4 ms

   # Run the display ip host command on Device A to check static DNS entry information, including mappings between domain names and IP addresses.

   <DeviceA> display ip host

   Host                 Age        Flags  Address
   host.com             0          static 10.100.1.2  

Configuration Files

• Device A configuration file

  #
   sysname DeviceA
  #
   ip host host.com 10.100.1.2
  #
  return

Networking Requirements

As shown in Figure 1-547, Device A serves as the DNS client. With the help of the DNS server, Device A can use the domain name «huawei.com» to access the host with IP address 10.2.1.3/16.

Configuration Roadmap

The configuration roadmap is as follows:

1. Enable dynamic DNS.

2. Configure the IP address of the DNS server.

3. Configure a domain name suffix.

Data Preparation

To complete the configuration, you need the following data:

• Domain names of Device B and Device C

• IP address of the DNS server

• Domain name suffixes

Procedure

1. Configure Device A.

   # Configure dynamic DNS entries.

   <HUAWEI> system-view

   [~HUAWEI]sysname DeviceA

   [*HUAWEI]commit

   # Enable dynamic DNS.

   [~DeviceA] dns resolve

   # Configure the IP address of the DNS server.

   [*DeviceA] dns server 10.3.1.2

   # Configure a domain name suffix «net».

   [*DeviceA] dns domain net

   # Configure a domain name suffix «com».

   [*DeviceA] dns domain com

   [*DeviceA] commit

   [~DeviceA] quit

   To implement domain name resolution, you must configure a route between Device A and the DNS server for them to communicate. For details about how to configure a route, see NEMid-End Router Configuration Guide — IP Routing.

2. Verify the configuration.

   # Run the ping huawei command on Device A. The host with domain name «huawei.com» can be pinged. The destination IP address for the ping operation is 10.2.1.3.

   <DeviceA> ping huawei.com

     PING huawei.com (10.2.1.3): 56  data bytes, press CTRL_C to break

       Reply from 10.2.1.3: bytes=56 Sequence=1 ttl=126 time=6 ms

       Reply from 10.2.1.3: bytes=56 Sequence=2 ttl=126 time=4 ms

       Reply from 10.2.1.3: bytes=56 Sequence=3 ttl=126 time=4 ms

       Reply from 10.2.1.3: bytes=56 Sequence=4 ttl=126 time=4 ms

       Reply from 10.2.1.3: bytes=56 Sequence=5 ttl=126 time=4 ms
   

     --- huawei.com ping statistics ---

       5 packet(s) transmitted

       5 packet(s) received

       0.00% packet loss

       round-trip min/avg/max = 4/4/6 ms
   

   # Run the display dns dynamic-host command on Device A. Dynamic DNS entry information stored in the cache is displayed.

   <DeviceA> display dns dynamic-host

   No  Domain Name           IpAddress            TTL       Alias

   1   huawei.com            10.2.1.3             3579  

   TTL indicates how long a DNS entry can exist, in seconds.

Configuration Files

• Configuration file of Device A

  #

   sysname DeviceA

  #

   dns resolve

   dns server 10.3.1.2

   dns domain net

   dns domain com

  #

  interface GigabitEthernet0/1/0

   undo shutdown

   ip address 1.1.1.2 255.255.0.0

  #

  rip 1

   network 1.0.0.0

  #

  return

• Configuration file of Device B

  #

   sysname DeviceB

  #

  interface GigabitEthernet0/1/0

   undo shutdown

   ip address 2.1.1.1 255.255.0.0

  #

  interface GigabitEthernet0/1/1

   undo shutdown

   ip address 1.1.1.1 255.255.0.0

  #

  interface LoopBack0

   ip address 4.1.1.1 255.255.255.255

  #

  rip 1

   network 2.0.0.0

  network 1.0.0.0

   network 4.0.0.0

  #

  return

• Configuration file of Device C

  #

   sysname DeviceC

  #

  interface GigabitEthernet0/1/0

   undo shutdown

   ip address 2.1.1.2 255.255.0.0

  #

  interface GigabitEthernet0/1/1

   undo shutdown

   ip address 3.1.1.1 255.255.0.0

  #

  interface LoopBack0

   ip address 4.1.1.2 255.255.255.255

  #

  rip 1

   network 2.0.0.0

   network 3.0.0.0

  network 4.0.0.0

  #

  return