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9.1

Trying to determined real source IP behind NAT on Checkpoint R65 Platform

Asked by SeeMeShakinMyHead in Checkpoint Firewall, Linux Networking, Consumer Firewalls

Tags: checkpoint firewall NAT, R65

I have 2 checkpoint R65 running in HA mode.  Normally, our firewall logs 20MB of logs in about 4-5 hours.  Lately, something has been performing ICMP requests at such a large number, that it writes a new log every 60-70 seconds.  This also triggers the non-TCP session quota (currently set at 50%) and starts blocking legitimate traffic as well.  When I look at the logs, something is natting behind the firewall performing these ICMP requests against various IP's and subnets (some don't even exist anymore).  The source IP is hidden behind the NAT, so I can't see what is the real source IP to then get to the root cause.  When I do a tcpdump -i eth4 | grep ICMP, I see the traffic, but I still only see the NAT'ed IP of the FW.  How can I find the real source IP?  By the way, I also have hundreds of networks and hosts defined on the firewall, so looking through them is like finding a needle in a haystack.  I would like to see if there is a way I can look at the NAT table at a given point.  Please advice.  If you need any questions asked to assist further, I will respond very quickly.  Thanks in advance for everyone's help.
[+][-]08/11/09 08:25 AM, ID: 25070135Accepted Solution

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About this solution

Zones: Checkpoint Firewall, Linux Networking, Consumer Firewalls
Tags: checkpoint firewall NAT, R65
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Solution Provided By: deimark
Participating Experts: 2
Solution Grade: A
 
[+][-]08/11/09 08:31 AM, ID: 25070197Author Comment

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[+][-]08/11/09 08:31 PM, ID: 25075552Expert Comment

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[+][-]08/12/09 04:18 AM, ID: 25077488Author Comment

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[+][-]08/12/09 06:04 AM, ID: 25078264Expert Comment

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[+][-]08/12/09 04:23 PM, ID: 25084111Author Comment

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