snoop my packets

Hi, I use the snoop command to analyze my packets on a machine, but I can't see anything except the headers (no content).

I logged to the machine, but I just see there is communication between the 2 machines, and no log, no passwd.

I should at least see the 'Authentification header' in the packets, but no.

here's my command:

snoop -i myfile -v -p1,100 | grep'Authentification'

Thank you for your help.

[473 byte] By [widjayy] at [2007-11-26 7:26:19]