[techtalk] Odd firewall outputs

[Kath]

I have a Debian 2.2 firewall doing ipmasquerade running the kernel that came with it (2.2.18 IIRC).  

This machine also serves as a web, email and DNS server.

I woke up this morning and saw the following on the monitor:

IP_MASQ:reverse ICMP: failed checksum from 24.112.23.202
IP_MASQ:reverse ICMP: failed checksum from 24.112.23.202
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