Apr 18, 2012 at 11:54 AM
Edited Apr 18, 2012 at 12:20 PM
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How can we add the Ethernet trailer (with padding and seq. no) to the packet in pcapdotnet? am using UDP Layer...
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Coordinator
Apr 18, 2012 at 8:19 PM
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Hi manik2k3,
Why do you need to add the trailer?
Usually, the padding will be added automatically when you send the packet.
What sequence number?
Boaz.
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Apr 19, 2012 at 5:29 AM
Edited Apr 19, 2012 at 5:44 AM
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Hi brickner,
Thanks for your prompt reply.. i want to send the trailer with padding + Sequence no.
0000 03 00 00 00 00 02 02 00 00 02 28 20 08 00 45 00 ........ ..( ..E.
0010 00 2b 01 12 00 00 01 11 a4 f9 0a 02 28 0d e0 e0 .+...... ....(...
0020 00 c8 c3 69 c3 69 00 17 00 00 00 06 00 03 4f 4b ...i.i.. ......OK
0030 20 20 20 52 52 50 43 17 76 00 00 0a
RRPC. v...
In the above example 00 00 is the padding and 0a is the sequence no.
basically i like to create a frame like the following.. pls help me.
| 7 octets |
1 octet |
6 octets |
6 octets |
2 octets |
45 octets |
Preamble
10101010
---
10101010 |
Start Frame
Delimiter
10101011 |
Destination
Address |
Source
Address |
Type
0x0800
IP V4 |
IP
Structure |
UDP
Structure |
Payload
1 à 17 octets |
Padding
0 à 16 octets |
| 1 octet |
4 octets |
12 octets |
SN
000
--
255 |
Frame
Check
Seq |
Inter Frame Gap |
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Coordinator
Apr 19, 2012 at 10:16 PM
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If you can provide a link to a pcap file that would be very helpful.
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I have implemented it by reducing the UDP and IP Layer's length. Thanks
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