Author: Filip Sneppe (Cronos)" <filip.sneppe@cronos.be>
Status: Submitted for kernel inclusion at 2.4.21-pre4 time

special hack for icmp-type 'any': Up to kernel <=2.4.20 the problem was: 
	'-p icmp ' matches all icmp packets
	'-p icmp -m icmp' matches _only_ ICMP type 0 :(

This is now fixed by initializing the field in userspace to icmp type 0xFF

See: https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=37
