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From: "fbsd_user" <fbsd_user@a1poweruser.com>
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Subject: help with tcpdump cmd syntax
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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?


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?