On Thu, 9 Jan 2014, Templin, Fred L wrote:
I don't doubt that your experience is valid for the environment you are working in. What I am saying is that there may be many environments where setting IPv4 link MTUs to 1520+ is a viable alternative and then the hosts can see a full 1500+ MTU w/o ICMPs. SEAL detects when such favorable conditions exist and uses limited fragmentation/reassembly only when they don't. Or, if fragmentation/reassembly is deemed unacceptable for the environment, then clamp the MSS.
6RD relays can be made cheap because they are stateless. 6RD implementation in hosts can be bade cheap, because it's easy. SEAL isn't stateless (obviously, since it can do re-assembly), thus increasing cost and complexity both in host and relay.
So while it might have a technical fit, it isn't really an operational or monetary fit right this minute. 6RD is widely implemented today, by the time any other mechanism is implemented, the use-case for IPv6 tunneled in IPv4 might be much less interesting, hopefully more are moving towards IPv4 over native IPv6 for new implementations.
-- Mikael Abrahamsson email: [email protected]
