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[Xen-users] second NIC MAC address for domU

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] second NIC MAC address for domU
From: "Jonathan M. McCune" <jonmccune@xxxxxxx>
Date: Thu, 11 Feb 2010 20:32:07 -0500
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Hello,

I have a server with two NICs running Xen 3.2 from Debian Lenny (eth0 and eth1). I'm wondering what the best method is to effectively dedicate eth1 to a particular domU. I have an existing DHCP entry for the MAC address of eth1, so assigning a different MAC to the virtual NIC in my domU and bridging that to eth1 within dom0 is an issue for me. I tried assigning the identical MAC address to my domU in the vif line in its config file. tcpdump in dom0 suggests that the DHCP requests are making it out onto the network, but the DHCP replies don't seem to be getting through to the domU.

I've also observed that it's possible to dedicate a PCI device to a particular domU with pciback, but the necessary module is not part of the stock kernel and I don't want the maintenance overhead of having to keep rebuilding a particular module, etc.

Should I be doing this with a routing-based configuration? Performance would be nice but this server is not heavily loaded, so I'm not too worried about performance.

Thanks for any suggestions,
-Jon


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