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Date: Sat, 05 Dec 2009 21:53:36 +0100
From: Fredrik Lindberg <fli@shapeshifter.se>
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To: Tobias Grosser <grosser@fim.uni-passau.de>
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Cc: freebsd-emulation@freebsd.org
Subject: Re: Bridged networking does not work on em0 / 8.0
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Tobias Grosser wrote:
> Hi,
> 
> I am trying to use VirtualBox since a while, however bridged networking
> never worked, even it is supposed to do so.
> 
> My Host is: FreeBSD 8.0 / RELENG, 32bit, em0 ethernet
> 
> I use a Knoppix LiveCD as a guest OS (also tried with debian and
> Windows)
> 
> When I try to get an IP using DHCP the request is sent out to my router
> and is returned to my freebsd host.
> 
> tcpdump on em0 on the FreeBSD host:
> 
> 11:30:35.614121 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> Request from 08:00:27:25:17:97 (oui Unknown), length 300
> 11:30:35.614131 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> Request from 08:00:27:25:17:97 (oui Unknown), length 300
> 11:30:36.621477 IP fritz.box.bootps > 255.255.255.255.bootpc:
> BOOTP/DHCP, Reply, length 548
> 
> However it never appears back at my linux guest
> 
> tcpdump on eth0 on the linux guest:
> 
> 11:30:34.008830 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> Request from 08:00:27:25:17:97 (oui Unknown), length 300
> 11:30:43.004510 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> Request from 08:00:27:25:17:97 (oui Unknown), length 300
> 11:30:58.015919 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> Request from 08:00:27:25:17:97 (oui Unknown), length 300
> 
> There seems also to be some kind of packet duplication, as the packet
> sent at 11:30:34 appears twice in the tcpdump of the FreeBSD host.
> 
> Any ideas how to debug this?
> 

What is the output of ngctl list while the guest is running?

Fredrik