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ASA 5510 acting as a DNS proxy

Posted on 2009-04-01
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Last Modified: 2012-06-21
We used to havea firewall that acted as a DNS proxy. We replaced it with a Cisco ASA 5510 that does not have this set up. Now, our webserver is having issues sending meail from teh DMZ because it has no DNS server to use.

Is there a way to set up a DNS proxy on the ASA 5510?
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Question by:amydnaz
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Expert Comment

by:Alan
ID: 24046323
Hi,

This may be missing the point, but why not point the webserver at a DNS server?

You could give it OpenDNS (for example):

208.67.222.222
208.67.220.220

Hope that helps,

Alan.
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by:amydnaz
ID: 24052094
That didn't work. I'm stumped as to why we can't seem to get the webserver to recognize DNS.
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Alan earned 1500 total points
ID: 24054418
Hi,

I am working on the assumption at this point that the DNS settings in the Webserver are pointing at OpenDNS.

Is the webserver connecting to anything outside at all?

What if you attempt a direct connection to, say, www.cnn.com at:

157.166.224.25

Can you connect from a web browser (if there is one on the webserver), or via telnet:

telnet 157.166.224.25 80

If so, what do you get using, say something like, NSLOOKUP on the webserver?  What is showing as the default resolver, and what is its IP address?

Thanks,

Alan.
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