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Re: [FW-1] DNS Question



> > 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
Let me further clarify:
Yes Zone transfers take place ontcp port 53, however ordinary DNS queries
that are large also take place via TCP 53.

-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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