David Conrad wrote: > > On Jun 17, 2010, at 12:18 PM, Martin Rex wrote: > > Maybe because it would be a big waste of network bandwidth and close > > to a Denial of Service (DoS) attack if every client would try every > > IPv4 and IPv6 address in parallel that it can get hold of for a hostname. > > In a world of broadband, gigabit ethernet interfaces, high speed > wireless, etc., I have some skepticism that attempting both v4 and v6 > connections in parallel is a "big waste", I don't know what the broadbands for the average home users look like where you are, but here they're typically <= 640kBit/s upstream. > > much less anywhere near "close to a Denial of Service (DoS) attack". If you look at hostnames such as hp.com which have 13 IPv4 listed in the DNS, it would probably have a significant effect on their infrastructure if suddenly every client would attempt 13 parallel TCP-connects and kill 12 of them pre-natal or during infancy. One would be needlessly and senselessly flooding the listen queues of many servers. Effectively, there is little that distinguishes such clients from SYN flood attackers. -Martin _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf