Re: Fragment Header

[Radhakrishnan.S]

That said; how should the case where we have the fragment header and both the Fragment Offset and the M flag is 0 be treated? => The one and only fragment.  :-) Doesnt make sense unless u want to test the reassembling capability of the receiver of the fragments. The presence of a fragment header is used in NAT-PT IPv4->IPv6 to indicate that the packet is fragmentable. (case where DF bit is NOT set in IPv4 header). Why do we need the M flag in the “fragment header” at all for IPv6? Having the fragment header itself would tell it’s a fragment and would distinguish between the first fragment and a non-fragment. => M flag is used to distinguish last frag from others!!!! Its used for identifying the last frag when computing the length during reassembly. Vishwas Manral wrote: Hi folks,   I have a doubt regarding the fragment header. Why do we need the M flag in the “fragment header” at all for IPv6? Having the fragment header itself would tell it’s a fragment and would distinguish between the first fragment and a non-fragment.   In IPv4 we did not have a fragment header, so the M flag was logical to have for distinguishing the first and a non fragment.   That said; how should the case where we have the fragment header and both the Fragment Offset and the M flag is 0 be treated?   Thanks, Vishwas     -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------

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