Firewalls: DNS port 53

Firewalls
(August 1995)

Indexed By Thread: [Previous] [Next]

Subject:	DNS port 53
From:	"Frank K. Senter" <fsenter @ mail . more . net>
Date:	Thu, 24 Aug 1995 11:14:06 -0500 (CDT)
To:	firewalls @ greatcircle . com

While rewriting my packet filter rules for more strictness, I discovered 
that my internal DNS server sends requests to the firewall DNS with both 
source and destination ports set to UDP 53.  Isn't that a little unusual?
If I allow packets with destination=UDP 53, can I get into trouble?

Frank Senter
Senior Information Specialist
Missouri Highway and Transportation Department
P.O. Box 270
Jefferson City MO 65102

Follow-Ups:

Re: DNS port 53
From: "Daniel O'Callaghan" <danny @ miricle . its . unimelb . edu . au>

Indexed By Date	Previous:	E-mail list. From: MikeF79 @ aol . com
Indexed By Date	Next:	Re: Did I hear an Echo? From: Karyn Pichnarczyk <karyn @ cisco . com>
Indexed By Thread	Previous:	E-mail list. From: MikeF79 @ aol . com
Indexed By Thread	Next:	Re: DNS port 53 From: "Daniel O'Callaghan" <danny @ miricle . its . unimelb . edu . au>