Re: [Xen-users] Networking problems

[Didier Trosset <didier_trosset@xxxxxxxxxxx>]

Michel Drescher wrote:
> Dear Xen wranglers,
>
> I have the following problem:
> ---- 8< ----
> However, and this is the downside, the VM brings up only the loopback
> device. The VM exports the virtual eth0 as RTL8139, but trying to bring up
> eth0 manually results in the following error:
>
> ---------- SNIP ---------- SNIP ---------- SNIP ---------- SNIP ----------
> mdrescher@baseline-vm:~$ sudo ifup eth0
> Password:
> eth0: ERROR while getting interface flags: No such device
> SIOCSIFADDR: No such device
> eth0: ERROR while getting interface flags: No such device
> SIOCSIFNETMASK: No such device
> eth0: ERROR while getting interface flags: No such device
> Failed to bring up eth0.
> ---------- SNIP ---------- SNIP ---------- SNIP ---------- SNIP ----------
>
> Unfortunately, as I don't have network and my vncViewer does'nt capture
> screens, I have to describe the dmesg output of domU:
>
> According to the dmesg output, the RTL8139too Fast Ethernet driver v0.9.28
> is loaded, which detects an "enhanced" 8139C+ chip (?) so it will use the
> 8139cp driver for improved performance (well, well...)
> Later, the driver says "unknown chip version, assuming RTL-8139"
>
> Can you help me out getting the following issues resolved?
> a) Getting networking up (obviously) using the real Tigon3 driver or
> something emulating
> b) When booting domU from the mini.iso, networking went just fine, but why?
You have to specify the mac address in the vif=... line of the domU config 
file. As you don't, the mac address is asigned a new random mac on each 
boot. This is the reason why the network works correctly during the install, 
but fails after the reboot: the system doesn't know about this *new* network 
device.
You should be able to know the mac you have been assigned during the install 
by looking in the file /etc/udev/rules.d/z25_persistent-net.rules
I've already been hit by this feature ;)

HTH
Didier

> b) When trying to export the disk image as "ioemu:sda" the domU Ubuntu 7.04
> mini.iso wasn't able to find the disk, probably because lacking an
> appropriate kernel module?
>
> Thanks, and any help is much appreciated!
>
> Attached TEXT files:
> - dom0-eth0-txt: Excerpt from dom0 dmesg output related to eth0
> - test.hvm: My HVM VM config file I'm using.
>
>
> Cheers,
> Michel
>
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
--
Didier Trosset-Moreau
Agilent Technologies
Geneva, Switzerland

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