problems using gif tunnels

[gumbo at bsdmail.org]

I am running two nodes with freebsd 7.2 release on both.  
node 1 has three gifs with tunnels configured on all. The first gif has a tunnel to node 2. 
Node two has one gif with a tunnel to node 1 configured.  If I start a multicast ping from 
node 2 to the inner address of node 1 gif0, everything is fine.  If I then bring down gif2 on
node 1, the ping receives no more responses.  The down gif should have no effect on the
ping.  Has anyone seen this problem ?  What's going on ?  Is this a known bug ?

Thanks,
Rick