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 From:  Timothy Jans <info at hyperdrive dot be>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] IGMP is filling up my Firewall Logs
 Date:  Mon, 13 Sep 2004 00:25:41 +0200
Ok, I think I discovered a bug and solved my problem :)

This is what I get with no explicit rule :

23:46:19.930192 WAN  	81.83.76.1  	224.0.0.1  	IGMP
23:46:19.929921 WAN 	81.83.92.1 	224.0.0.1 	IGMP
23:46:19.929646 WAN 	81.83.32.1 	224.0.0.1 	IGMP
23:46:19.929361 WAN 	81.82.222.1 	224.0.0.1 	IGMP
23:46:19.929041 WAN 	81.165.144.1 	224.0.0.1 	IGMP
23:46:19.928769 WAN 	81.165.156.1 	224.0.0.1 	IGMP
23:46:19.928496 WAN 	10.74.0.1 	224.0.0.1 	IGMP
23:46:19.928239 WAN 	172.22.208.1 	224.0.0.1 	IGMP

This is what I get with an explicit non-logging rule for IGMP :

23:50:29.966303 WAN  	10.74.0.1  	224.0.0.1  	IGMP
23:50:29.966047 WAN 	172.22.208.1 	224.0.0.1 	IGMP

You can clearly see that the 81.x.x.x are not logged anymore.
The others are probably logged because they are private IP ranges.

When I now uncheck "block private networks" (Interfaces -> WAN) the firewall won't log any IGMP
packet :)