* Templin, Fred L > 6RD could use SEAL the same as any tunneling technology. SEAL makes > sure that packets up to 1500 get through no matter what, and lets > bigger packets through (as long as they fit the first-hop MTU) with > the expectation that hosts sending the bigger packets know what they > are doing. It works as follows: > > - tunnel ingress pings the egress with a 1500 byte ping > - if the ping succeeds, the path MTU is big enough to > accommodate 1500s w/o fragmentation > - if the ping fails, use fragmentation/reassembly to > accommodate 1500 and smaller > - end result - IPv6 hosts always see an MTU of at least 1500
In order for the BR to support reassembly it must maintain state. That's going to have a very negative impact on its scaling properties... Tore