Mal Hacker wrote:
> TCP checksums are evaluated by attaching a pseudo
> header in the start of the TCP segment which u are
> going to be sent. Actually that pseudo header is like
> this...
>
> struct pseudohdr
> {
> struct in_addr source_address; // 32 bit netid/hostid
> struct in_addr dest_address; // 32 bit netid/hostid
> unsigned char place_holder;
> unsigned char protocol;
> unsigned short length;
> struct tcphdr tcp;
> } phdr;
>
>
> where the protocol is IPPROTO_TCP , place holder is
> zero and length is htons(sizeof(struct tcphdr));
length is the length of the header and data, not just the header.
--
Glynn Clements <glynn.clements@virgin.net>
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