Viewing websites through a cisco 857w

[ictss]

Hi, I seem to be having a problem with displaying web pages over our 857w router. The ADSL seems to be connecting OK and we can get a web page displayed on a PC if we type the ip address of the site into the address bar. so if I type www.google.com we get an DNS error message displayed on the browser, but if we type 64.233.183.99 the page displays perfectly.

We have been using a vigor 2600+ router which connect perfectly every time. Different dns server ip's have been used but we still get the same results.

What are we missing, I have attached the running config so any help would be greatly welcomed.

[Kevin Dorrell]

You need to specify the DNS server under the DHCP pool rather than in the ip name-server command. I think the ip name-server command is for use by the router itself, and is not passed out to the DHCP clients.

What you need is:

ip dhcp pool sdm-pool1

dns-server 63.251.92.193 64.74.96.242

Kevin Dorrell

Luxembourg

[globalnettech]

Hello,

in general, you do not need to put the IP address of a DNS server into the configuration of your router. Try and take the following entries out of your configuration:

ip name-server 63.251.92.193

ip name-server 64.74.96.242

Also, change the access list 101, and take out these 4 lines:

access-list 101 permit udp host 64.74.96.242 eq domain any

access-list 101 permit udp host 63.251.92.193 eq domain any

access-list 101 permit udp host 194.74.65.68 eq domain any

access-list 101 permit udp host 194.74.65.68 eq domain host 217.x.x.x

access-list 101 permit udp host 194.72.9.38 eq domain host 217.x.x.x

and replace those with:

access-list 101 permit udp any any eq domain

Regards,

GNT

[johnnylingo]

If you do end up removing the DNS servers from the router itself, also make sure to add "no ip domain-lookup". Otherwise, the router will still continue to attempt DNS lookups (trying to locate a DNS server via broadcast), and it will get very annoying.

But the problem here is that there are no DNS servers listed in the DHCP scope.

[johnnylingo]

As mentioned, you need to specify the DNS servers in the DHCP pool. So change your config to this:

ip dhcp pool sdm-pool1

dns-server 63.251.92.193 64.74.96.242

!

Another option is run a DNS server on the router itself. In this case, the config would be:

ip dns server

!

ip dhcp pool sdm-pool1

dns-server 10.10.10.1

!

This method is especially useful if you have multiple ISPs.

[ictss]

Thnks Guys as soon as I enabled the DNS in DHCP and ran the ip dns server command everything worked perfectly.