North American Network Operators Group|
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Re: Rate limiting UDP,Multicast,ICMP
* [email protected] (Jared Mauch) [Tue 13 Nov 2001, 18:11 CET]: > As far as multicast goes, I'm not aware of anyone running > native multicast that would limit the traffic. Those still using > DVMRP may have multicast rate-limits in place as to not have a massive > bandwidth sucking sound coming from their general direction. I'm sure that the operators of the networks that were massively hindered when some worms started scanning random hosts in 224/4 (that's what you get if you don't understand IP and just use a random number generator to get something resembling an IP address) were rate-limiting packets to multicast addresses pretty quickly. All those new sessions (one UDP packet to a multicast address) created state in lots of routers throughout their networks. Dropping TCP to 224/4 of course also helps in this particular case. Apart from not wanting to point fingers, the names of some of these network operators escape me at the moment too, even though I believe they were posted here at the time. Regards, -- Niels.