Alert from kernel

From: Prakash Purushotham (ppuru@yahoo.com)
Date: 08/17/01 

Message-ID: <20010817103855.44114.qmail@web11505.mail.yahoo.com>
Date: Fri, 17 Aug 2001 03:38:55 -0700 (PDT)
From: Prakash Purushotham <ppuru@yahoo.com>
Subject: Alert from kernel
To: focus-linux@securityfocus.com

All

I found the following messages in the system logs

Aug 17 10:39:05 xxxxxx kernel: IP_MASQ:reverse ICMP: failed
checksum from 203.126.27.196!
Aug 17 10:39:14 xxxxxx kernel: IP_MASQ:reverse ICMP: failed
checksum from 203.126.27.196!
Aug 17 10:39:23 xxxxxx kernel: IP_MASQ:reverse ICMP: failed
checksum from 203.120.44.8!

Any clues what these could mean?

RHL 7.0, 2.2.17-14, ipchains

ICMP
echo out, echo reply allowed
destination unreachable, parameter problem, source quench, time
exceeded are allowed both ways.

ingress and egress filtered using rp_filter and ipchains rules.

Prakash

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