Hi Ron,
> Assuming that the tunnel endpoint updates its estimate of the PMTU, and the
> resulting GMTU is lower than 1280, the tunnel endpoint
> has another decision to make. When it receives a packet with size > GMTU, it
> can either:
>
> - discard the packet and send an ICMP PTB, or
> - Fragment the delivery header
There is a third option:
- Fragment the delivery header and also send an ICMP PTB (subject to
rate limiting)
In other words, the packet gets through and the original source gets a PTB
message indicating that future packets should include a fragment header.
That is what I was saying in 'draft-templin-6man-linkadapt', which you might
want to look at.
In this way, even if the PTB message is lost 1280byte packets will still be
delivered successfully as per any IPv6 link. When PTBs get through, however,
you get a useful optimization.
Thanks - Fred
[email protected]
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