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Wireshark-dev: Re: [Wireshark-dev] text2pcap help needed

From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Mon, 8 Jan 2007 23:11:27 -0800

On Jan 8, 2007, at 10:30 PM, jaiswal.vikash@xxxxxxxxx wrote:

Could anyone please explain how the above values produced such display ( version : 4 , header length : 24 , etc. ) in the wireshark gui.

Step 1: order a copy of

	TCP/IP Illustrated, Volume 1

and read chapters 1, 2, and 3.

Step 2: armed with what you've learned from that book about the format of Ethernet headers and IP headers, look at the first 14 bytes of data in the packet (you'll now know how that produces the display you see for the Ethernet data in the Wireshark GUI) and then look at the next 24 bytes of data after that (you'll now know how that produces the display you see for the IP data in the Wireshark GUI).