[dns-operations] Shameless plug for our Zonecheck software (Was: af.mil DNS issue

Joseph S D Yao jsdy at center.osis.gov
Tue Jul 4 00:56:55 UTC 2006

On Sat, Jul 01, 2006 at 10:55:20PM -0400, Joe Abley wrote:
> Cool. I hadn't actually heard of anybody blocking 53/tcp on purpose,  
> with full knowledge of the implications before. I have some questions!

Yes.  It's done very often because most people don't understand that DNS
queries are carried on both TCP port 53 and UDP port 53.  This is a FAQ
in some firewall FAQ lists.

Joe Yao
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