From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb 18 17:36:32 2008
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Mon, 18 Feb 2008 17:37:22 +0100
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Cc: Tofig Suleymanov <tofig@freebsd.az>, hackers@freebsd.org
Subject: Re: if_start() and sending packets problem
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Hi,

>
> Doing tcpdump on the interface and pinging does not show any packets
> flowing. Please note that tcpdump shows the arp who-has request right
> after I assign the ip address.
>

If think you have to use the BPF macros before you get anything in tcpdump.

BTW: Have you looked at any other USB network drivers ?

--HPS