[Vserver] Network local to vserver host and guests?

I started researching how to do this or if it is even possible but want
to make sure I'm not using the wrong terms in my searches.

I build and use vservers where the guests need to cooperate with each
other. That is, a system with with guests running Postfix, PostgreSQL,
  or Apache ( multiple guests as they are mod_perl driven ) and they all
need to communicate with each other. So I want to build a Virtual LAN (
different from my take on a VLAN ) with virtual NICs.

    Basically the traffic never hits the physical LAN/WAN.

That make sense? IS it possible? If so what what should I be looking
for in my research?

TIA,
Rod

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