[FW-1] DNS and Check Point Firewall-1 on Nokia device

[straightLiners IT Security Team <security@FW1-NOSPAMSTRAIGHTLINERS.DE>]

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Hello !

I encounter the problem, that DNS resolution doesn't work out properly.

When a clients asks the internal DNS to resolve a host's name it takes
seriously long resulting in a time-out. The internal DNS forwards the request
to a specific external DNS server but obviously gets no answer. Instead its
digging recursively a series of unknown DNS server.
After about half a minute everything's fine and the host will resolve within
 a few ms.

When digging the external DNS directly everything's within normal response
times.

I did a test setup at home using the same configuration files and
 everything's working out just fine.

The firewall is a hardware device from Nokia running Check Point Firewall-1.

Does anyone know that problem? Which ACLs work out fine and are secure,
 still? Any other ideas?

- --

straightLiners IT Consulting & Services
IT Security Department
Sebastian Schneider
Metzer Str. 12
13595 Berlin
Germany

Phone: +49-30-3510-6168
Fax: +49-30-3510-6169

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