Virtual interfaces on Ultrix

Virtual interfaces on Ultrix

Post by Gunnar Helliese » Wed, 06 Dec 1995 04:00:00


Anyone tried using the code on to build
support for virtual interfaces into the kernel of DEC Ultrix 4.x?

Experiences, hints, patches, things to do/avoid??


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1. one physical interface, 3 virtual interfaces, and inetd

I have an embedded box with a single ethernet interface that I will
configure as some number of virtual interfaces:

eth0:0 -
eth0:1 -
eth0:2 -

A request will come in on a particular interface and port, say and will invoke a program.

Here's the part I don't understand:

The program that is invoked has to take different action depending on
which IP address was used.

Is there some way for a program invoked by inetd to get the connection

The program acts as an intelligent relay of sorts, acting as a bridge
between the requestor on the network and a piece of hardware connected
to a serial port.

For reasons of scalability, it would be much easier to have 1 serial
mapped to 1 IP address; there are hundreds of these clusters, and some
have 1, 2, 3, or 4 connections.

(Yes I could probably do it with sockets, but I already have the bridge
software written and tested with inetd, so why reinvent the wheel if I
don't have to....)


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