* Stuart Henderson ([email protected]) wrote: > On 2009/12/11 14:14, Joakim Aronius wrote: > > Could someone please hit me with a clue stick if I am wrong here... > > If there is tunnel reducing the MTU then the tunnel endpoint should > > send an ICMPv6 packet too big to the sender. > > You can't rely on "should".
Ok, granted, I was a bit sloppy with words there, the RFC says must for the ICMP message. But reading up a bit on how the source host shall handle the situation it turns out that you can do pretty much as you like... RFC 2460: > In order to send a packet larger than a path's MTU, a node may use > the IPv6 Fragment header to fragment the packet at the source and > have it reassembled at the destination(s). However, the use of such > fragmentation is discouraged in any application that is able to > adjust its packets to fit the measured path MTU (i.e., down to 1280 > octets). Cheers, /Joakim
