For example, say ping command, packet length = 84 bytes, IP header length =
20 bytes, ICMP header length = 8bytes and my BT header length = 5 bytes
so I made the new packet of length 20+5+20+(84-20) = 109 bytes and called
the function set_verdict, with data_len = 109, and this 109 bytes long
Now at the recieving machine I should get the 109 bytes long packet, but in
fact IP_QUEUE is giving the packet of 84 bytes only, that are in fact first
84 bytes of the 109 bytes long packet.
Note - I have not touched the checksum fields.
So, my questions are :
1) When I am sending 109 bytes, why I am getting only 84 bytes?
2) I tried changing the payload (ie, packet length field) to 109, in that
case the packet never reaches the destination, why?
3) Is this problem due to checksum?
4) Is there any way using netfilter, I can get the packet from ethernet
directly, that will suit my actual design? or any other easy way?
5) How can I verify that the sending machine is actually sending 109 bytes(I
mean not reducing it to 84)?
Please send me your suggestions to find out the solution for this problem
Shiva Raman Pandey
Research Associate, Computer Science -R&D
Sasken Communication Technologies Limited
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