How to check if my linux PC was installed with firewall ?

From: Zi Zhou (zhouzi@yahoo.com)
Date: 05/29/02 

From: zhouzi@yahoo.com (Zi Zhou)
Date: 29 May 2002 11:19:34 -0700

Hi,

I am a dummy about linux firewall. Currently I have encoutered a
problem that make me suspect that my linux redhat7.1 PC was installed
with firewall and blocked my SNMP traffic from an windows 2000 PC's HP
openview NNM, but I don't know how to check if my linux PC has
firewall enabled and how to disable it, can someone help me with this?
I have be trying to solve this SNMP port unreachable problem for more
than a week, and firewall is the only clue I current have, would like
to try it out as soon as possible.

thanks

Zi

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