DNS Configuration on Cisco Routers
To use DNS, a DNS Server must be configured. In a network, a router can be configured as DNS Server. In this lesson, we will talk about how to configure a Cisco Router to serve as a DNS Server n a network.
For our DNS Server Configuration Example, we will use the below topology:
1. Enable DNS Server
2. Enable Domian Lookup
3. Public Name Server Configuration
4. Host / IP Address Mappings
5. Router Interface IP Configuration
6. Hosts IP Configuration
7. Configuration Verification
Now, let’s configure our Cisco Router as a DNS Server with the above steps.
Enable DNS Server
To enable DNS Server, we will use “ip dns server” command. With this command, our router is becoming a DNS Server.
RouterA # configure terminal RouterA (config)# ip dns server
Enable Domain Lookup
To enable Domain Lookup we will use “ip domain-lookup” command.
RouterA (config)# ip domain-lookup
Public Name Servers Configuration
On the router, we will configure Public Name Servers. With this configuration, our DNS Server router will ask to the configured Public DNS Servers for every DNS Requests and replied back. Here, you can use any Public DNS Server addresses.
RouterA (config)# ip name-server 220.127.116.11 RouterA (config)# ip name-server 18.104.22.168
Host / IP Address Mappings
In this step, we will give the hostnames and their ip addresses to the DNS Server manually. With these information, DNS Server can answer to the requests coming by hostnames with IP addresses.