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Private networking

Lets think, that you have only one external IP -- $EXTIP.

And you want to have several vservers runned without think about port overlapping.

The one solution is:

So, what you doing:

1. Set up dummy0 iface on host

# /etc/network/interfaces on debian box, 
# configure on other distros with your preferred way
auto dummy0
iface dummy0 inet static
    address 192.168.1.250
    netmask 255.255.255.0

2. Set up your vserver:

# Contents of /etc/vservers/<vserver>/interface/0/
dev: dummy0
ip: 192.168.1.1
name: 1
prefix: 24

I suggest you to use value of name equal to last digit of ip -- for easy separation

3. Now, configure firewall on server:

iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -d ! 192.168.1.0/24 -j SNAT\
--to-source $EXTIP

And for each service that runned on vhosts local address $VHOST and port $INTPORT you select one external port $EXTPORT and map it by running

iptables -t nat -A PREROUTING -s ! 192.168.1.0/24 -m tcp -p tcp\
--dport $EXTPORT -j DNAT --to-destination $VHOST:$INTPORT

Thats all!

Try ping pool.ntp.org from your vserver -- it should ping fine.

Try to connect to your $EXTIP:$EXTPORT (from other server) -- you will successfully connect to service at your vserver.