01-09-2013 06:59 AM
In PanOS, how are the zones established for inbound rules? I have a bi-directional NAT created for a device located in a DMZ. I also have a security policy allowing traffic to the NAT address from the untrusted zone (Internet). When traffic comes in, it is marked as source zone => untrusted, destination zone => trusted and denied because there is no policy for untrusted to trusted. Shouldn't the destination zone be my DMZ? See attached file for the log.
01-09-2013 08:14 AM
Hi jeff,
For NAT rules, zone matching is based on ingress interface and egress interface after PBF policy or route table lookup.
Zone matching for Security rules is a post nat process; so a second lookup will occur after applying destination NAT rule (if there was a Nat policy match).
on the other side, for ip matching, in security policy, you always have to keep pre-NAT IP address.
When using Static SNAT bi-directional, an implied DNAT rule will be derived from your SNAT one (szone [any],sip [any] - dzone [same],dip [snated ip]).
You can see it with # show running nat-policy.
In you case, I think something is wrong with routing (maybe a wrong mask), your source IP from DMZ zone seems to be routed back in trust zone...
furthermore, don't forget to keep your pre-NAT IP address in your security policy to allow the traffic..
Hope this will help you.
Regards
-Nicolas
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