Comments on: The art of network debugging with tcpdump http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/ Experience is the name everyone gives to their mistakes. Mon, 08 Mar 2010 01:50:09 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Azadeh http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-215 Azadeh Tue, 01 Dec 2009 08:22:13 +0000 http://www.msamir.net/?p=378#comment-215 I have a tcpdump file. I want to truncate some amount of payload of this file. I know that -s parameter is for limit the size.But this command is not working for me.It does not reduce the size.(new.tcpdump should smaller than outside.tcpdump). tcpdump -r outside.tcpdump -s 234 -w new.tcpdump what is the solution? I have a tcpdump file. I want to truncate some amount of payload of this file. I know that -s parameter is for limit the size.But this command is not working for me.It does not reduce the size.(new.tcpdump should smaller than outside.tcpdump).
tcpdump -r outside.tcpdump -s 234 -w new.tcpdump
what is the solution?

]]> By: deepak http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-88 deepak Sun, 14 Jun 2009 10:25:16 +0000 http://www.msamir.net/?p=378#comment-88 @Abhay you need to be root to use tcpdump. sudo tcpdump (-i eth0) @Abhay
you need to be root to use tcpdump.
sudo tcpdump (-i eth0)

]]> By: shivam http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-84 shivam Tue, 09 Jun 2009 06:57:27 +0000 http://www.msamir.net/?p=378#comment-84 can you tell me what is the function of ICMP types in command line of tcpdump also tell me distinguishly that what is the work of all flags,primitives in tcpdump. can you tell me what is the function of ICMP types in command line of tcpdump

also tell me distinguishly that what is the work of all flags,primitives in tcpdump.

]]> By: msamir http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-32 msamir Mon, 30 Mar 2009 09:40:28 +0000 http://www.msamir.net/?p=378#comment-32 Abhaya Kumar command working fine with me. Maybe you don't have Permission to create any files in that folder you are in try create it before you run the command if you can not then it's file Permission error "touch tcpdumpfile" debian:/tmp# tcpdump -nnxX -i eth0 -w tcpdumpfile -C 3 tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes ^C537 packets captured 537 packets received by filter 0 packets dropped by kernel Abhaya Kumar command working fine with me.
Maybe you don’t have Permission to create any files in that folder you are in try create it before you run the command if you can not then it’s file Permission error
“touch tcpdumpfile”

debian:/tmp# tcpdump -nnxX -i eth0 -w tcpdumpfile -C 3
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
^C537 packets captured
537 packets received by filter
0 packets dropped by kernel

]]> By: Abhaya Kumar http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-31 Abhaya Kumar Mon, 30 Mar 2009 00:05:49 +0000 http://www.msamir.net/?p=378#comment-31 response to [root@mytux ~]# tcpdump -nnxX -i eth0 -w tcpdumpfile -C 3 is: tcpdump: tcpdumpfile: Permission denied Why? response to
[root@mytux ~]# tcpdump -nnxX -i eth0 -w tcpdumpfile -C 3
is:

tcpdump: tcpdumpfile: Permission denied

Why?

]]> By: Ritu G http://www.msamir.net/the-art-of-network-debugging-with-tcpdump/comment-page-1/#comment-19 Ritu G Tue, 17 Mar 2009 20:02:44 +0000 http://www.msamir.net/?p=378#comment-19 thanks! thanks!

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