From: Jim March <1.jim.march@gmail.com>
> jim@jim-lappy:~$ sudo tcpdump -s 0 -w file.pca host 10.0.1.4
> tcpdump: WARNING: eth0: no IPv4 address assigned
> tcpdump: listening on eth0, link-type EN10MB (Ethernet)
> 
> This comes closer, but...it's still listening on eth0.
> How do I point it to wlan0?

The Fine Manual for tcpdump suggests the -i option.  tcpdump goes to the
lowest-numbered interface by default, which is sensible, but is not always
what you want.

-- 
Matt G / Dances With Crows
The Crow202 Blog:  http://crow202.org/wordpress/
There is no Darkness in Eternity/But only Light too dim for us to see

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