On 21.12.2011 18:54, Marc Petit-Huguenin wrote:
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Hi Roland,
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One comment below.
And Section 5.7 states:
If the message is not fragmented, then both the
first and last fragment bits are set to 1 and the offset is 0
resulting in a fragment value of 0xC0000000. Note that this means
that the first fragment bit is always 1, so isn't actually that
useful.
- the last sentence is a somewhat weird statement
For reference, here's the email exchange for this text (search for "A.20"):
http://www.ietf.org/mail-archive/web/p2psip/current/msg05801.html
Thanks for the pointer, but its doesn't make it more reasonable.
IMHO it just provides a hint that something is broken: if it is
always set to 1, it doesn't provide any useful information, so
you could simply leave it out. Not sure how it was actually meant
to be used, but if it was indicating "first fragment" then it is
set for the first fragment and for non-fragmented packets together
with the last fragment bit. For all intermediate fragments it
probably had to be set to zero, so then it would have changed.
I think that my proposed definition is less confusing to
implementers and protocol debugging people.
Regards,
Roland
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