RE: [Xen-devel] VIF Interfaces not transparent to all ethernet protocols?

["James Harper" <JamesH@xxxxxxxxxxxxxxxx>]

I had some really annoying things happen with the tlan driver where a
change in link status (eg cable unplugged then re-plugged in) would
cause the card to drop out of promiscuous mode.

ifconfig eth3 promisc

or
ifconfig eth3 -promisc
ifconfig eth3 promisc

would set things right again.

Nobody on lkml seemed interested in my patch to fix it.

James

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Armin Kemper
> Sent: Tuesday, 9 November 2004 07:29
> To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] VIF Interfaces not transparent to all ethernet
> protocols?
> 
> Hi,
> 
> I'm new to XEN and trying to migrate from UserMode Linux, because its
much
> faster!!!
> 
> After having some trouble messing around with devfs (I'm using
gentoo...)
> the VMs are booting fine.
> 
> 
> My current UML Setup looks like this:
> 
> Main Machine:
> linux-2.4.22-gentoo   (using SKAS patch)
> 2 ethernet interfaces
> eth0 connected to LAN
> eth1 connected to DSL-Modem
> 
> The UML-VM has 2 virtual Interfaces
> eth0 and eth1
> apperaing as tap0 and tap1 on the main machine
> 
> the vm is connected to the lan via proxy-arp/routing (uml-stadard),
> the tap1 Interface ist bridged to eth1 on the main machine.
> 
> The UML-VM is running the rp-pppoe driver on eth1 (tap1)
> 
> 
> 
> 
> My XEN 2.0 setup:
> what I tried to do is creating 2 bridges (one for each physical
interface)
> on the host, bridging the first VIF to the LAN and the second to the
DSL-
> Modem.
> 
> when I start the rp-pppoe inside the vm, I can see the PPPoE packets
> appearing
> on the eth1 Interface (using tcpdump -nei eth1 inside the vm), but
they
> never
> arrive at the corresponding vif on the main machine (using tcpdump
-nei
> vif1.1).
> 
> The other way, sending PPPoE packets, to the vif1.1 from the main
machine
> works.
> I can see them inside the VM, but the other direction seems to be
blocked.
> 
> If I set an IP-address on the eth1 interface inside the vm, I can see
> IP/ARP
> packets to, but no PPPoE.
> 
> After searching the XEN Mailing lists and XEN Changlogs, I found that
> there has
> been a change in one of 1.x releases making changes to the handling of
> ethernet
> packets, but I can't find any similar code in the current release.
> This was in ChangeSet@xxxxxx
> 
> Sowhere in the XEN-docs I read that vif Interfaces are transparent,
but in
> this
> case they aren't.
> 
> 
> So my Question is:
> I this a bug? Otherwise I cannot find anything in the docs about this.
> If this is the right behaviour, where can I change it?
> I havent't found any filtering code neither in the backend nor the
> frontend
> driver.
> 
> 
> Best regards,
> 
> Armin Kemper
> 
> 
> 
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