[samir7399]

we are using a Cisco 1720 router.

The primary Ethernet0 address is 203.197.x.1 and all those servers which use this range use 203.197.x.1 as a gateway can surf the internet.

Now we have added one more network to the Ethernet0 port 59.160.x.1 with the same subnet mask as that of the first IP. The servers based on this network can ping IP addresses on the internet but the name resolution is limited to IP addresses within the ISP's domain. That means they cannot resolve for yahoo.com but they can resolve isp.com

Do we have to configure something more on the router for the name resolution to happen for all sites?

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Do you have an internal DNS server? if not, can you ping your ISPp DNS?

[chicagotech]

Do you have an internal DNS server? if not, can you ping your ISPp DNS?

[samir7399]

We do not have a internal DNS server. However i am able to ping the ISP's DNS server.

When I do a nslookup it is available and resolves all dns names within the ISP's domain for e.g ...mail.isp.com or isp.com or isp.net.
The moment I request yahoo.com or anything for tht matter it says ...Query refused.

[hudihoo]

try to tracert to see if it is your router or theirs that is causing problems

[samir7399]

Well now it seems the problem is different. From the router I can ping all websites.

But when I assign one of the IP's from the second range for e.g 59.160.x.2 and use 59.160.x.1 as the default gateway (which is the secondary IP for E0 on the router) I get the DNS problem which I mentioned.

[hudihoo]

you need to configure a dns server. you should contact your ISP for this problem. there are a few other things i can do if i was at the computer that stuff takes many trial and error attempts and is hard to explain. if you know someone who knows stuff about networks. alot of school and like vocational schools or community colleges will do this for free or lowcast as an example to help the students learn. you should look into that. they can be trusted because if a student messes up the teachers are all cisco certified.