Le 4 août 09 à 16:30, Lars Eggert a écrit :
Hi,
On 2009-8-4, at 16:27, Rémi Després wrote:
You seem to have missed that the proposal includes a relaxation of
the constraint that zero-checksum UDP datagrams MAY be accepted by
hosts ion the future, just to avoid unnecessary black holes in case
of v4 to v6 translations.
isn't it a non-starter for a translation based *transition*
mechanism to depend on host changes?
I don't think so, because it's never too late do do some good without
doing any harm.
IMHO, translators SHOULD forward zero-checksum datagrams RATHER THAN
dropping them. No harm expected.
Avoiding to drop them by computing payload checksums is another
possible behavior, at least for single fragment datagrams. But it
implies to compute payload checksums, which may be considered too
expensive and opening a door to DOS attacks.
IMHO also, hosts, at their next patch release, SHOULD silently accept
zero-checksum IPv6 datagrams RATHER THAN silently dropping them. No
harm expected.
By doing this, connectivity during the transition period will
eventually be improved, possibly before translators are largely
deployed.
Some people say this transition period is bound to be long. Who knows?
Regards,
RD
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