Please help with the configuration of Debian 8 and Xen and networking with only one network card and multiple external IP addresses.

Hi!

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.

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 thought that maybe FireHOL could make my life easier, but I am still 
stuck with a working solution.

Can someone help me or give me a hint in the right direction please?

Thanks,
Christian.
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