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paket header query?

can it be possible to modify packet header? can i add some own header field to packet header and let it be sent by kernel?
my system is redhat linux 9 kernel 2.4.24?

sunnycoder

Hi b123coder,

You can use raw sockets and form header in any way you like ... However note that if you form the header which does not correspond to the standards (RFC for that protocol ... see ietf.org) then recepient willnot be able to understand it and will reject it ..

http://mixter.void.ru/rawip.html

good luck
Sunnycoder

sunnycoder

Hi n_uthra25,

btw, if you just wish to mangle the packet a bit without descending into the kernel, then check libipq
http://www.cs.princeton.edu/~nakao/libipq.htm

Sunnycoder

owensleftfoot

http://sourceforge.net/projects/pacgen/ is a program which allows you to send customised packets.

b123coder

ASKER

i want to know also:-
while reading computer networks book i came across a statement that all machines are required to receive at least 576 bytes?
what is that mean? then what is the ethernet handling 1500 bytes payload then? it means that those machines cannot transfer 1500 payloads?
Is there any room for implementing own header field in options of IP header?

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sunnycoder

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sunnycoder

>What you read was specific to a protocols and universally applicable to all protocols

I meant

What you read was specific to a protocol and NOT universally applicable to all protocols