How to set the tcp option timestamp while building a tcp SYN packet using python?

Question

I need to send a tcp SYN packet with timestamp value in tcp option. Since tcp opts should be prepacked in 32-bit representation, can anyone brief me how to set the value in 32 bit packet representaion with a example.

Thanks in advance

Community · Accepted Answer · 2021-10-07 06:15:07Z

1

You should be able to do that pretty easily with Scapy. When defining your TCP layer, just use

TCP(flags='S', options=[('Timestamp', (TSval, 0))])

where TSval is your timestamp value. If you want to convert the resultant packet to its binary representation, call str() on it.

In future packets, you can replace the 0 with the appropriate TS echo reply per RFC 1323.

edited Oct 7, 2021 at 6:15

CommunityBot

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answered Feb 22, 2011 at 19:27

nmichaels

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