North American Network Operators Group|
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Re: Martian list of IP's to block???
On Fri, Oct 01, 1999 at 08:49:23AM -0700, firstname.lastname@example.org wrote: > > deny ip 18.104.22.168 22.214.171.124 any log > > I'm not convinced that blocking native multicast is a good idea. This is blocking packets sourced with a multicast ip, not destined for multicast. ex: when i source multicast traffic the src ip is the ip of the machine sending the traffic, and the dst is the ip of the multicast group. so traffic would go from (for example) puck.nether.net (126.96.36.199) to the multicast group for Places all over the World (188.8.131.52). This acl would prevent someone from sending a ping to your router, and faking the src ip to be something like all-routers.mcast.net, and having you start ping flooding all the multicast routers, or multicast hosts out on the internet. (Think semi smurf-attack like). - jared -- Jared Mauch | pgp key available via finger from email@example.com clue++; | http://puck.nether.net/~jared/ My statements are only mine. END OF LINE |