ASA 5510 acting as a DNS proxy

Posted on 2009-04-01
Medium Priority
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?
Question by:amydnaz
  • 2
LVL 22

Expert Comment

ID: 24046323

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

You could give it OpenDNS (for example):

Hope that helps,


Author Comment

ID: 24052094
That didn't work. I'm stumped as to why we can't seem to get the webserver to recognize DNS.
LVL 22

Accepted Solution

Alan earned 1500 total points
ID: 24054418

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:

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

telnet 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?



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