http://www.intac.com/~cdp/cptd-faq/section2.html#ports
Question 2.18. DNS ports
Date: Wed Jun 16 21:57:36 EDT 1999
The following table shows what TCP/UDP ports bind before 8.x DNS uses to
send and receive queries:
Prot Src Dst Use
udp 53 53 Queries between servers (eg, recursive queries)
Replies to above
tcp 53 53 Queries with long replies between servers, zone
transfers Replies to above
udp >1023 53 Client queries (sendmail, nslookup, etc ...)
udp 53 >1023 Replies to above
tcp >1023 53 Client queries with long replies
tcp 53 >1023 Replies to above
Note: >1023 is for non-priv ports on Un*x clients. On other client
types, the limit may be more or less.
...there must be some way to restrict the client to a fixed set of ports...
oh well.
eric
From: "Todd" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: CF-Community <[EMAIL PROTECTED]>
Subject: Re: DNS Client request port (TCP filtering on NIC)
Date: Thu, 28 Aug 2003 18:08:26 -0400
53
----- Original Message -----
From: "Eric Dawson" <[EMAIL PROTECTED]>
To: "CF-Community" <[EMAIL PROTECTED]>
Sent: Thursday, August 28, 2003 12:45 PM
Subject: DNS Client request port (TCP filtering on NIC)
> I have started to filter TCP/UDP ports on my server NIC, but can no
longer
> browse the Internet from the server. What port do I need to open up to
> receive DNS information?
>
> Or am I barking up the wrong tree? any advice or links is appreciated.
>
> Eric
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