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From: Arnd Bergmann <arnd@arndb.de>
Subject: Re: [Qemu-devel] Re: Network bridging without adding bridge with
	brctl, possible?
Date: Sun, 20 Feb 2011 22:33:37 +0100
References: <alpine.LFD.2.02.1102192024040.22181@bbs.intern>
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To: Gerhard Wiesinger <lists@wiesinger.com>
Cc: Jan Kiszka <jan.kiszka@web.de>, qemu-devel@nongnu.org

On Sunday 20 February 2011, Gerhard Wiesinger wrote:
> >> qemu-system-x86_64 ... some params ... -net
> >> nic,model=e1000,macaddr=1a:46:0b:ca:bc:7c -net tap,fd=3 3<>/dev/tap10
> >>
> >> Seems to me quite logically because macvtap0 (and not macvlan0) is
> >> associated with /dev/tap10 but with another mac address set in KVM.
> >>
> >> Any furher ideas?
> >
> > As you already noticed: you mixed up the MAC addresses. KVM's must be
> > the same as used for its frontend macvtap. The macvlan is only for the
> > host and has a separate one.
> 
> I think I did everyting right in the last 1st try but it still didn't 
> work:
> 1.) macvtap0: MAC: 1a:46:0b:ca:bc:7b
> 2.) macvlan0: MAC: 1a:46:0b:ca:bc:7c, 192.168.0.23
> 3.) KVM: MAC: 1a:46:0b:ca:bc:7b, assigned IP from DHCP: 1a:46:0b:ca:bc:7b
> (looks like an IP address conflict inside guest and outside?)
> 
> That should be as you explained, right?
> 

The qemu command above has the 7c mac address, which does not match.
Do you see the interface in the guest using "ip link show" ?

	Arnd