adding google dns to dhcp

you can try to put google dns in  your router or firewall and at client end just put gateway's ip in dns field.

Hope problem will be solved

You really haven't given us much to go on, or even what your desired setup would be. In a small workgroup? Adding google DNS to clients via DHCP is fine. Is your complaint that you can't use another DNS provider, such as OpenDNS? Or are you using active directory? Which requires clients use an AD DNS server. In which case Shaun *may* be right that forwarders is an option. But some people (me) have a natural distrust of Google, so if you WANT to use root hunts, you should say so... so we know where to focus our advice. In short, you haven't told us enough to reliably help.

Basically you need to tell us what is broken and why you want to change it...

hoping you have AD and DNS servers in place...

Rather than Google DNS, use OpenDNS instead.  Google DNS does not always return truthful results.  In particular, the Spamhaus blocking list (which is checked via DNS) always indicates "not blocked" when using Google DNS.

Falsus in uno, falsus in omnibus.  If Google DNS returns incorrect data for a site as important as Spamhaus, it is probably doing so for other sites as well.

Demonstration of this problem below, first using OpenDNS, then using Google.  The test FQDN "2.0.0.127.sbl-xbl.spamhaus.org" should always return 127.0.0.2 / 127.0.0.4, blocked.  Google DNS does not.

root@www:# nslookup 2.0.0.127.sbl-xbl.spamhaus.org
Server:         208.67.220.220
Address:        208.67.220.220#53

Non-authoritative answer:
Name:   2.0.0.127.sbl-xbl.spamhaus.org
Address: 127.0.0.2
Name:   2.0.0.127.sbl-xbl.spamhaus.org
Address: 127.0.0.4

root@www:# nslookup 2.0.0.127.sbl-xbl.spamhaus.org 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8#53

** server can't find 2.0.0.127.sbl-xbl.spamhaus.org: NXDOMAIN

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Out of curiosity, would you want to resolve to a none route-able IP?

Nvm.
I see it is Spamhaus return codes. Only an issue if DNSBL is used.
Spamhaus recommends using your own DNS. I would not go so far as to say Google DNS is not trustworthy only because it does not support DNSBL.
I do however prefer OpenDNS because I can do some content/malicious filter on it

Closing Inactive question