On 08/04/2006 14:56, fbsd_user wrote: > I tried > tcpdump -i rl0 src host 218.166.163.180 -w /usr/tcpdump.data > tcpdump -i rl0 host 218.166.163.180 -w /usr/tcpdump.data > tcpdump -i rl0 src ip 218.166.163.180 -w /usr/tcpdump.data > > but got syntax error msg with no hint of what was wrong > > If I remove the -w stuff it works. Meaning it prints to the screen. > But I want to write to file > > Can you help me out here on the syntax error?
Have a look at 'tcpdump -h' (or man, of course). Expression (i.e. 'src host 218.166.163.180') is the last argument. This should work: tcpdump -i rl0 -w /usr/tcpdump.data src host 218.166.163.180 > One other thing. When does tcpdump get access to the packet? > > My firewall has a block log rule for that ip address. > Does tcpdump see the packet before ipfilter ipnat does? Yes. I'm not familiar with kernel code, but I can perfectly see all packets with tcpdump. HTH, Karol -- Karol Kwiatkowski <freebsd at orchid dot homeunix dot org> OpenPGP: http://www.orchid.homeunix.org/carlos/gpg/0x06E09309.asc
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