Re: Modifying farwarded packets
- From: "Farooque Khan" <farooque.khan[AT]gmail[DOT]com>
- Date: Thu, 21 Jun 2007 18:53:39 +0530
--
Farooque Khan
Project Manager
Infospectrum India Pvt. Ltd.
farooque@xxxxxxxxxxxxxxxxx
Phone: +91 712 229 3711
www.info-spectrum.com
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"Ronny" <ronny@xxxxxxxxxxx> wrote in message
news:OOQX2j9sHHA.4796@xxxxxxxxxxxxxxxxxxxxxxx
I have a few theoretical questions-
1. Can someone advise what is the total length of ip packet as indicated
in
the ip header? It doesn't match the total length as indicated in Ethereal
address (in the first column of the packet display).
It's usually IP Hdr size + Protocol header size (TCP/UDP etc) + protocol
payload size
Ethereal also shows the total bytes on wire which usually also include
ethernet header size etc.
2. I use WinPcap library to fetch Ethereal dump of TCP packets collected
from some 2 hosts communication. For each packet in the callback which my
program fetch, it has to send the packet to a new host by after modifying
both (source and destination) addresses and check sums in the ip and tcp
layers.
My question- is there anything more that should be modified like the
ethernet layer addresses or something else?
Depends on how you are sending the packets.
Regards
Ronny
.
- References:
- Modifying farwarded packets
- From: Ronny
- Modifying farwarded packets
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