How to setup a Xen domU with multiple subnets on one interface?

StackOverflow https://stackoverflow.com/questions/3525926

  •  29-09-2019
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Question

I have a host (host1.example.com) with the following IPs:

IP: 10.0.0.6
Subnet: 255.255.255.192
Gateway: 10.0.0.1
Broadcast: 10.0.0.63

IP: 10.0.1.9
Subnet: 255.255.255.248
Broadcast: 10.0.1.15

How to setup host1.example.com to host dom0 on both subnets?

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Solution

You can create multiple network interfaces and attach them to different bridges in Domain-U's profile:

vif=['mac=xx:xx:xx:xx:xx:xx,bridge=eth0', 'mac=xx:xx:xx:xx:xx:xx,bridge=eth1']

If you want one network card of DomU have two IPs, that's not a problem related to Xen:

You can create another configuration for ethx (let's use eth0): eth0:0. eth0 uses device eth0, and eth0:0 uses device eth0:0. Then you can give eth0 and eth0:0 different IP addresses, broadcast subnet, DNS, etc. Then you can change Linux route table by ip command: http://fclose.com/p/linux-command/8-ip/#lbBB

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