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RE: Can't Resolve from behind firewall
From: "John Canty" <John.Canty () Vibro-Meter com>
Date: Wed, 20 Nov 2002 12:36:50 -0500

Rule number 1 about cisco devices.

DO NOT USE GUI's provided by them (or anyone else for that matter) to
configure their devices. The CLI mode will be harder, yes, once you
realize how things are done you'll wish you started out that way.


-----Original Message-----
From: YashPal Singh [mailto:ysingh () quark co in] 
Sent: Saturday, October 19, 2002 1:30 AM
To: Ahmed.Shazly; security-basics () securityfocus com
Subject: RE: Can't Resolve from behind firewall

I think you have not allowed DNS incoming traffic. To debug your problem
allow incoming udp packets from any to your ipaddress. I guess this is
only problem bcoz DNS reply from ur ISP get blocked by your Firewall.
Moreover to check that this problem is just bcoz of firewall....put
all rule at the top and then check if you are able to get DNS replies.


-----Original Message-----
From: Ahmed.Shazly [mailto:ahmed.shazly () hotpop com]
Sent: Thursday, October 17, 2002 5:45 AM
To: security-basics () securityfocus com
Subject: Can't Resolve from behind firewall

Hi everyone,
  I Just got a PIX 501 for my company and since they have strict
policies i
do have to strict usage to port 80, now with the PDM i try permiting
outgoing traffic from the my local net on port 80 to any outside port
permit outgoing traffic on port 53 for the DNS to any port since we use
DNS server of our ISP. the only thing that happens is that i still can't
resolve websites and they only work if i use their IP addresses. i do
PAT and i'm not sure wheather it has anything to do with whats going on


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