224.0.0.0/8 is a multicast network, it�s mainly (and the only known to
me) use is OSPF, which works with UDP-packets to 224.0.0.5 and .6

hth,
&rw

Michael Meskes wrote:
> 
> Could anyone please tell me what's so special on this subnet that ipmasq
> allows icmp and udp output to it? It's the only hard coded subnet I found in
> this package.
> 
> Michael

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