Messages in this thread |  | | Date | Mon, 8 Apr 1996 19:24:43 +0000 (GMT) | From | Tigran Aivazian <> | Subject | tcpdump -i lo |
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Hello guys,
I cannot remember who asked this so I have no other choice but to answer to everyone in hope that the "right" person reads this too. Somebody asked recently how to dump network traffic from loopback device. On my Linux box there are two versions of tcpdump :
Version 3.0 Usage: tcpdump [-dDeflnOpqtvx] [-c count] [-i interface] [-r filename] [-w filename | -W filename] [expr]
and:
Version 3.0.2 Usage: tcpdump [-deflnOpqtvx] [-c count] [-i interface] [-r filename] [-w filename] [expr]
Looking at README file for 3.0 one discovers that it contains all the features of standard 3.0.2 and 3.0.3 (patches) of tcpdump. And 3.0 allows to dump lo: tcpdump -i lo Whereas 3.0.2 refuses saying "snoop: unknown physical layer". So, those who wish to dump loopback traffice should go to ftp.funet.fi and get a file tcpdump-richard-1.7.tar.gz.
Regards, Tigran.
PS. If you want to dump sl? traffic make sure you looked at print-sl.c file and #define CSLIP in there because configure script seems to miss that one.
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