some question

[张 亮]

hi,i have a question about tcp/ip stack,could you help me?
when we send a tcp packet with tcp_maxopt(tcp_maxopt = min(my mss,mss offerd by opposite socket) +length of TCP options,as ecos does in function tcp_mss() of the file tcp_input.c) to IP,and IP insert some IP options into packet,so maybe length of whole IP packet > ifp->mtu,so Ip must fragment this tcp packet,and TCP failed to avoid fragmenting in host itsself.
as we know,TCP always avoid to fragment as possible,maybe the condition above does not occur often,but it is possible.
right?
or wrong,please tell me,Thank you very much!

BRS/johnsonest






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