On Wed, 1 Sep 2010, Simon Leinen wrote:
Note that the same rate-limit will also cause stars in IPv6 traceroutes through popular routers if the default setting is used. ... Anybody knows which defaults are used by other devices/vendors?
I've noticed 6to4 relay rate-limiter blackholes before (e.g. in Your.org relay in AMS, got quickly fixed once I reported it). FWIW, Linux default is 1000pps and BSD has 100pps which is too low for a popular relay. In our relays we've used 1000-3000pps. The majority of ICMPv6's is caused by windows boxes testing the relay's liveness. Depending on the MTU configuration of the relay's tunnel interface (there isn't a BCP on this I think), you will also get more issues if you run the relay at MTU=1280 rather than (say) 1480. But using 1480 may result in an IPv4 blackhole if you source packets from an anycast address and your destination is e.g. behind PPPoE, so... -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings