dom0 with guests on two different subnets

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http://serverfault.com – I have a Xen dom0 running CentOS. It has an assigned IP address from a /29 block. There are guests with addresses also from the same /29 block. The dom0 is using bridged networking. Everything is happy there. Now, I recently got assigned more IP addresses (a /28) to add more guests. This group of addresses is on a completely different range. However it still shares the same VLAN from the switch and is fed into the same interface on the dom0. I cannot feasibly change that. How can I assign addresses from the /28 block to guests and get traffic flowing? I would also like to try and save IP add (HowTos)