Re: [Xen-users] One nic multiple ip's

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

nomid wrote:
> xend is bridge enabled
> dom0 /etc/network/interfaces:
>
> auto lo
> iface lo inet loopback
>
> auto eth0
> iface eth0 inet static
> address 193.34.X.88
> netmask 255.255.255.128
> gateway 193.34.X.1
> -----------------------------------------
> domU /etc/network/interfaces:
>
> auto lo
> iface lo inet loopback
>
> auto eth0
> iface eth0 inet static
> address 93.209.x.104
> netmask 255.255.255.128
> gateway 193.34.X.1
>
> I try these, its right, or missing something?
No - that's not right.

Apologies, but I missed that you had 193.34.X.88 and 93.209.x.104 - 
two entirely different subnets. 193.34.X.1  is not a valid gateway 
for 93.209.x.104, so that machine would have no connectivity.
BTW - this isn't specific to XEN, it's a general networking/IP 
addressing issue.
I'm still trying to figure out exactly what you are being provided 
with in terms of IP addresses. Is 193.34.X.88 the only address you 
have in the 193.34.X.0/25 subnet ? Did your ISP give you a gateway 
address to use in the 93.209.x.104/25 subnet ?
My **guess** is that 193.34.X.88 is your "outside" address, and that 
your ISP routes the 93.209.x.0/25 addresses to it. If that is case, 
you need a router between 193.34.X.88 and 93.209.x.0/25. My 
preference is to use a separate DomU for a two port firewall (see the 
thread titled "Question about using Xen in a periphery 
firewall/router" from last week). Alternatively you'll want to run 
your Som0 in routed mode with 193.34.X.88 as your outside address, 
and something in 93.209.x.0/25 for your inside address.
--
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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