> BEHAVE's issue is to decide whether dropping them is
> an acceptable recommendation for v4->v6 translators.
So there are really several cases
1) No fragmentation:
1a) Checksum correct, => No issue, just translate.
1b) Zero checksum, no fragmentation => Should compute the checksum,
then translate
1c) Invalid checksum => Should drop.
2) Fragmentation:
2a) Enough resource to reassemble the packet:
reassemble;
2a1) checksum present & correct => translate
2a2) zero checksum => Should compute the checksum, then
translate
2a3) invalid checksum => drop
2b) Not enough resource to translate the packet:
MAY drop the packet.
The main problem in case 2b is, what to do with the next packets. If the relay
cannot perform reassembly, it will not know whether subsequent segments follow
an initial segment with checksum, or without. There may be ways to pipeline
segments, but that does not seem realistic.
-- Christian Huitema
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