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03.28.2008 at 05:35PM PDT, ID: 23278859
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IP/TCP/UDP Packet generation code
Tags: C#
I'm using sharpPcap for capturing packets, but I also need some C# code examples for generating packets from scratch. I'm especially interested in inserting data into the header options field so I can track packets on the listener side without having to parse the packet payload data. Links or short examples are appreciated.

Thanks
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Question Stats
Zone: Programming
Question Asked By: gromul
Solution Provided By: CyrexCore2k
Participating Experts: 1
Solution Grade: A
Views: 32
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03.28.2008 at 11:50PM PDT, ID: 21235750

Rank: Master

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03.28.2008 at 11:50PM PDT, ID: 21235750

Rank: Master

Well if you don't know anything about it you'll have to start by learning some stuff about working with bytes and bits. It'll come in handy for setting flags, and computing checksums.

http://www.codeproject.com/KB/cs/leftrightshift.aspx

I'd also recommend reading up on the RFCs

http://www.faqs.org/rfcs/rfc791.html
http://www.faqs.org/rfcs/rfc793.html
http://www.faqs.org/rfcs/rfc768.html

Lastly I'd recommend you download WireShark. It uses one of the PCap libraries itself but more importantly it will give you a breakdown of the IP, TCP and UDP headers which, if you capture your computers response and save the transmission you should be able to test your code by making sure it mimics what the standard libraries of your operating system are doing.

http://www.wireshark.org/
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628