Mark,
> Your right about 1280. However, following that logic, the IPv4 Internet
> should have an MTU of no greater than 576 bytes, because blackholes are
> possible with MTU's larger than that. Yet the common MTU on the IPv4
> Internet is 1500.
That's true today. But my experience while travelling and staying in
random hotels towards the end of the dial-up era was that I often
had to clamp the IPv4 MTU at (say) 512 to make things actually work.
I've had experience with 6to4 of abject PMTUD failures with remote servers
trying to do 1480. So I think that Remy is correct as far as a fail safe
solution *today* goes. Since 6RD is very much a transitional technique
before an ISP is ready to run native, I don't see this as a significant
inefficiency.
Brian
Regards
Brian Carpenter
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