Les Biffle wrote:
> > pkt.ipbit.ip_sum=in_cksum((unsigned short*)(void*)&pkt,20);
> > pkt.tcpbit.th_sum=tcpsum(&pkt.ipbit);
>
> You need to do the TCP checksum first. It changes the payload (the TCP
> checksum). The IP checksum includes all data, so must be done after the
> payload changes are done.
i think this is incorrect. the IP checksum only includes the IP header and
any IP options. therefore order should not matter.
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