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understanding tcpdump
hi folks
am new to openbsd, but using it on our business server. I have been using systat, pfctl, tcpdump and other tools to monitor server logs as well as the apache logs. Question following the following command "sudo tcpdump -ttt -r /var/log/pflog port 22 |less" if found one entry which puzzled me "mar 31 14:33:44.484756 xxx.xxx.xxx.xxx:22 >xxx.xxx.xxx.xxx:80 R 0:0(0) ack 1 win 0(pf)" i read this as ip xxx.xxx.xxx.xxx:22 connected to our webserver xxx.xxx.xxx.xxx:80 port 80 what made me curious was the :22 of the connecting machine. Does this mean that the user or robot as xxx.xxx.xxx.xxx:22 simply was outgoing from their machine on port 22 to my server at port 80??????????? we were curious because we block all p22 traffic from anywhere except our internal network????? what does R 0:0(0) ack 1 win 0(pf) mean ????? yes have read man page for tcpdump (don't mind be pointed to more neewbie docs that would help w/this) any help appreciated |
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