["Ronnie Sahlberg" <ronnie_sahlberg@xxxxxxxxxxxxxx>]

>
> This presents 2 capture streams on separate interfaces.
> I have a PC laptop with 2 LAN interfaces (one on motherboard and one
PCCard/PCMCIA).
> I use 2 iterations of tethereal, one collecting on eth0 and one collecting
on eth1.
> When collection is complete I use mergecap to create a single capture
file.
> Works a treat: RedHat 7.3, Ethereal 0.9.9
>

Since you use linux you should be able to tell it to capture from the
network device : all

this will capture from all devices simultaneously and there will not be any
need to run
multiple instanes of tethereal nor to use mergecap