OK here's the situation. We have are SMTP email server and are primary DNS
server behind a PIX 520 firewall running Ver. 5.2(3). So far everything is
running smoothly considering. We have one problem though, when we do a
reverse lookup we can't get a reply. We are doing NAT with the PIX. We
have some outside email servers that are failing on there reverse lookups to
us when someone send mail to a user outside.
My question is this, What does it take on the PIX firewall to allow reverse
DNS lookups to pass in and out of the firewall?
Any help would be appreciated. I am by no means a security admin, and this
has gone straight over my head.
Thanks
Karl Homburg, MSCE
Brenco, Inc.
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