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Re: [FW-1] DNS Question



What is incorrect ! AFAIK 53/TCP is used for zone transfers please
correct me if i am wrong. ???Dear Don please refer to RFC 1035


Sadir Don wrote:

53-TCP is used for zone transfer should be secured 53-UDP can be open to
all. TIP.

This is not correct. Please read my post below.

-Don


After all the IPSO upgrades and service pack upgrades for our
Nokia/Checkpoint 4.1 SP5a solution, we started seeing some random
results with our DNS servers.  Sometimes, it would fail on the first
lookup - but after that it would be ok... my question is simple... for
the last several years we've had the simple 2 rules for our DNS Servers:

1.    Any (Source)    DNSServers(Destination)    DNS-53(Port)
2.     DNSServers (Source)    Any (Source)    DNS-53 (port)

The question is simple...are we missing something obvious???  Our DNS
servers are Windows 2000.


When you say DNS-53, do you mean UDP or TCP? You need to allow both in
order for DNS to function properly. Most DNS requests use UDP port 53,
however larger requests use TCP port 53. It may be these larger requests
that are failing.

-Don


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