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Network Security Firewalls
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DNS UDP Issue on CISCO router?

from [Varnam, Gary] Network Security [Permanent Link]
Subject: DNS UDP Issue on CISCO router?
Date: Mon, 22 Nov 2004 17:45:56 -0000 


Hi,

We have two internet pipes with two ip different ranges. Some addresses
from PIPE2 are NATed by our ISP1 to a range of addresses valid on PIPE1.

Scenario: ISP2 NATs all traffic 2.2.2.2 to 1.1.1.1,
 DNS UDP to 2.2.2.2 it fails,
 DNS UDP to 1.1.1.1 works,
 DNS TCP to 2.2.2.2 works,
 DNS TCP to 1.1.1.1 works,

Our firewall logs and accepts all 4 connections has valid and are valid
DNS queries.

I have been told it might an IOS issue on ISP2 but cannot find anything
on the CISCO web-site.

Has any body seen this issue or know of issue of relating nating UDP
traffic with Cisco routers?

Regards


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