I've installed CHR on linode successfully, even documented it here.
However, I will like to create 1 additional interface (for private network), but CHR does not seem to detect it.
Linode is KVM and I'm configured for Full-virtualization (paravirtializations does not work at least up till 6.40)
I've read some post stating it works, but no direction on what was done to achieve this.

Well ... On VMware ESXi , I just shutdown the CHR , add an additional Ethernet interface (make sure the new Ethernet interface is the same type as the other existing interfaces , the power up the CHR. That's normally all there is to it.

Unless --- However , If you are trying to add a 5th Ethernet, then things can start to get strange.

Something to consider is this:
A chr with only 1 (or 2) Ethernet interfaces. Then use tagged vlans (802.11 trunks).
This could enable you to have many many many Ethernet network interfaces while only using a few outside Ethernet interfaces.

I hope this helps

North Idaho Tom Jones