Date: Mon, 1 Jun 2009 18:36:12 +0200 (CEST) From: Juergen Lock <nox@jelal.kn-bremen.de> To: kalinoj1@iem.pw.edu.pl Cc: freebsd-emulation@freebsd.org Subject: Re: Qemu: Assigning two tap devices to one virtual machine Message-ID: <200906011636.n51GaCbJ007208@triton.kn-bremen.de> In-Reply-To: <20090523223024.GA93488@volt.iem.pw.edu.pl>
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In article <20090523223024.GA93488@volt.iem.pw.edu.pl> you write: >Hello all, > >I'm running qemu 0.10.5 on CURRENT machine and experienced an >interesting problem. > >I try to run a single qemu machine with two network interfaces (tap's) >connected to the same bridge - I need this for playing with m0n0wall for >example. > >The qemu launch looks similiar to this: > >qemu -net nic -net tap -net nic -net tap -cdrom cdrom.iso -curses > >What happens is that when qemu starts up - my machine locks (sometimes I >manage to kill qemu and recover it, sometimes not). I see that it's a >problem with network bridge - looks like the infitine loop of arp >requests that get replicated infinitely (it also kills/floods my real network >that is connected through the bridge to the tap devices). > >My question is - have any of You tried to use multiple tap devices within >one qemu machine? Can you replicate this problem in your environments? > >One note: there is no problem if I run two qemus and each of them has a >tap device connected to bridge0. They coexist and I have no network >issues in both guests. I can post qemu-if{up,down} scripts if needed. Ok just in case this hasn't been resolved yet... Try something like qemu -net nic -net tap -net nic,vlan=1,macaddr=52:54:00:12:34:57 -net tap,vlan=1 -cdrom cdrom.iso -curses and if you want you can also add `,model=e1000' to the -net nic parameters, that one (em(4) on FreeBSD) should perform a little better than the default ne2kpci (ed(4) on FreeBSD.) Explanation: vlan= is used to associate -net nic with -net tap/user/pcap connections (default is vlan=0), and macaddr= you need because qemu uses one single default macaddress (52:54:00:12:34:56 atm) for all -net nic and you can't have two nics with identical macs on the same network. Good luck, :) Juergen
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