I was recently reviewing firewall logs and they are filled with this event, which appears to be occurring over 10 times a second.
There was a previous thread created on this - viewtopic.php?t=48098. However, I already checked for scripts and netwatch and that did not help.
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may/13 22:49:08 firewall,info drop_invalid input: in:(unknown 1) out:(unknown 0), proto ICMP (type 3, code 1), 192.168.100.1->192.168.100.1, len 225
Any ideas on what could be causing this?