Re: [Xen-users] Please help with the configuration of Debian 8 and Xen and networking with only one network card and multiple external IP addresses.

[SZABO Zsolt <szazs@xxxxxxxxx>]

On Tue, 23 Feb 2016, Christian-Josef Schrattenthaler wrote:

> I have a rootserver with only one network card and 4 official (external IPs). 
> The server runs under Debian 8. I installed the Xen of the distribution. I 
> added the 4 IPs to the network card (like it is described in the official 
> Debian documentation). And if I do a checkup and a test, everything seems to 
> work fine.
Hi,
that's great for the beginning... :-)

> The idea now is to create a couple of virtual servers under Xen which uses 
> internal IP addresses (e.g. 10.0.0.1 - 10.0.0.5). All of the servers should 
> be able to connect to the internet (would be cool, if I could decide which 
> server uses which external IP address to appeare on the Internet), but only a 
> couple of them should accept incoming request. Depending on the external IP 
> and the used port I need to forward the request to an internal IP address of 
> on of my virtual servers.
> I tried to find the solution myself, but I got stucked. After reading a lot 
> of manuals I don't know what would be the right way. I am completely confused 
> about all of the possible options. I found nowhere a documentation or an 
> Howto for this situation.
I guess that it is a routing or iptable problem...
Not quite clear how do you want to use the offcial (not local) IP-s...

I would configure the domU's with these IP addresses and then set up
corresponding iptable rules.

For the local IP-s, you could try to use ipalias (eth0:0, etc.) configured
in each domU-s, perhaps..  if it is really necessary (e.g. the domU-s 
are part of a LAN containing other hosts, too).
Regards,
--
sz.zs

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