Xen "mixed networking" Debian Dom0 howto?

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http://serverfault.com – I have a Debian Squeeze Dom0 with two DomU's already configured using the xen network bridge scripts (with public ip's) works fine. I now want to setup "eth1" on both DomU's in routed mode with private ip ranges (no external access required on this interface). How do I set this up on the Dom0 without affecting the existing bridge setup? (HowTos)