Hi,

Server DNS address (which is same as Server IP) is 192.168.10.10 and I want to configure clients to use open DNS 8.8.8.8 (to get connect to internet)

In a lab setup, I have a dedicated /static IP address that was obtained from ISP.
ISP provided subnet mask and default gateway addresses.

On a CISCO router I have configured the serial interface /WAN port to reflect the ISPs settings. 
Server is connected to Router's switch port and has its NIC IP address 192.168.10.10 

Any

DNS server - set forwarders to google (8.8.8.8, 8.8.4.4), enable recursion

Point internal clients to dns server (192.168.10.10) 

Dns server will answer local requests for which it is authoritative or has in cache, other requests it queries Google then answers client

Thanks for reply.

Please have a look on attached screenshot.

Currently I am using local server IP 192.168.10.10 as DNS, should I keep using this? OR use alternate DNS?

Here is screenshot of the Server and a client's NIC.

You're welcome. As long as the DNS server can reach 8.8.8.8, you can remove 192.168.1.1

So you should attempt to ping 8.8.8.8 from the DNS server. If it resolves then remove 192.168.1.1

Client and server configuration looks correct

Thanks for reply. 

Little bit confused, 

As long as the DNS server can reach 8.8.8.8, you can remove 192.168.1.1

But 192.168.10.1 is the default gate way are we mixing DNS with default gateway?

As per the screenshot and advised by "Noah Sparks" , you can remove 192.168.1.1 from DNS forwarders. Any internet traffic for DNS resolution will use google DNS servers for naming resolution.

Hi N A Malik,

As Noah has mentioned, So you should attempt to ping 8.8.8.8 from the DNS server. If it resolves then remove 192.168.1.1

If the DNS server could ping 8.8.8.8, it means that the DNS server could send forward packets to the public server. As the dns servers default gateway has been configured to be 192.168.10.1 in NIC, it is not necessary to add the forwarder in DNS.

Best regards,

Anne he

Hello and thanks for reply all.

Please have a look on the screenshot, I can ping 8.8.8.8 and has removed the GW address from Forwarders.