Re: [Xen-users] Dom0 IP Detection in Routed Mode

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Aaron Cossey wrote:

> With the server I'm running in routed mode, when I bring up an IP 
> inside a DomU with:
>  ip addr add x.x.x.x/32 dev eth0 peer x.x.x.x/32 broadcast x.x.x.x
> The IP comes up on the DomU, then I have to manually add routing for 
> it on the Dom0 with a command like:
>  ip route add x.x.x.x dev vif8.0 scope link src x.x.x.x
Yes, that is correct when you abuse IP addressing like that - and 
it's nothing to do with Xen.
Normally, you would have both devices in the same subnet - and for a 
point to point link the smallest valid subnet is /30. So you'd have 
(eg) 192.168.1.13/30 on one end, and 192.168.1.14/30 on the other 
end, and each device will then automatically add a route of type 
"connected" for that subnet.
Doing /32 addressing like that, and adding specific routes, is one of 
those tricks used for working around other issues (such as lack of 
addresses).
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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