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Simple DNS split example


I'm using a Cisco 1841 over DSL for internet access and a personal web server. I have searched for a simple DNS split configuration onet the Internet, but none of the examples I have found had worked on my router.

Does anyone have a simple example of DNS split to share with me? I'm newbie on Cisco routers.




Everyone's tags (2)

Hello, Marcio.It's not

Hello, Marcio.

It's not recommended to make your Cisco a dns, server, but it's possible:


ip name-server
ip domain-lookup
ip host <my_WEBserver_URI>
ip dns server


And make your router a preferred DNS on your computer/laptop.

PS: ASA has DNS doctoring feature, but it's not your case (to have ASA) :)

Cisco Employee

Hi Marcio,There is currently

Hi Marcio,

There is currently an Ask the Expert session running at this page which is focused exactly on DNS and DHCP and issues like yours. You may want to repost this thread there.

In any case, what IOS version is running on your 1841 router? In addition, can you post the split DNS configuration you have tried to implement? Please be aware of the fact that split DNS has been added around version 12.4(9)T so if you happen to run an older IOS, it perhaps does not support the split DNS yet.

Best regards,


New Member

Hello Peter!I'm not using the

Hello Peter!

I'm not using the Split DNS on my router yet! Let me explain what's happening.

I have a web server running on my private network on the machine and I can access it using the mentioned address. This server have a FDQN and I can reach it from outside my network (Internet) without any issue.

I would like to use the FDQN to access it from machines inside my private network, but I cannot due to some security feature on cisco router. I have read some articles stating we need to have a "Split DNS" to allow machines inside the private network can access the web server on the address using the FDQN, as machines outside the private network do.

I tryed to find a simple "Split DNS" to try here, but I didn't found any that could be used. All I have found are very complex examples. I'm using the following firmaware on the router:

HomeNet#sh version
Cisco IOS Software, 1841 Software (C1841-IPBASEK9-M), Version 12.4(24)T3, RELEASE SOFTWARE (fc2)
Technical Support:
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 23-Mar-10 05:11 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T5, RELEASE SOFTWARE (fc1)

HomeNet uptime is 23 hours, 37 minutes
System returned to ROM by power-on
System image file is "flash:c1841-ipbasek9-mz.124-24.T3.bin"

I'm not using Cisco Router as a DHCP server, since I have a Linux machine running ISC-DHCP-SERVER on my network. I have attached some pictures to ilustrate the issue, one accessing using FDQN and other using server IP address.


Best Regards!


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