[Simh] The Ultimate SIMH VAX Networking Challenge!

[Jason Stevens]

I've always wondered about using bridge interfaces, or some kind of
tun/tap bridge solution much like how OpenVPN can bridge tun/tap's to
an ethernet to allow network access....

What host OS are you going to try this on?

On Sat, Jul 4, 2009 at 5:49 PM, Seth Morabito<sethm at loomcom.com> wrote:
> Hey everyone,
>
> I've got a puzzler for the more experienced SIMH users here who might
> already be doing what I'm trying to do.
>
> My end goal is to have a single host system, with a single physical
> Ethernet, hosting two (or more!) SIMH VAX instances. Each SIMH VAX
> should be able to communicate with all the others, and with the host,
> and all of them should be reachable from the public Internet.
>
> So, for a concrete example: Assume the host has a single ethernet,
> eth0, with address 192.168.0.100. The two simulated VAXen should have
> addresses 192.168.0.101 and 192.168.0.102, and be able to communicate
> with the host, with each other, and with anything else on the
> 192.168.0.0/24 network.
>
> I've been trying to wrap my head around various techniques using
> taptap.c and bridge-utils, but I have been frustrated getting anything
> to work.
>
> For reference, here are the pages I've been studying:
>
> http://www.retrocomputinggeek.com/retrowiki/SIMHNetworking/
> http://www.itsecuritygeek.com/itsgeek/comments/simh-modified-version-of-taptapc/
>
> The technique of using taptap.c works well for host-to-SIMH
> communication, but the VAX is not routable to the outside world since
> it needs to be on its own network. Conversely, trying to use
> bridge-utils to create a tun0/eth0 bridge just causes the host to
> become unrechable on eth0's IP address (quite alarming when I was
> trying to set up the bridge remotely, and ssh simply froze up after
> adding eth0 to the br0 bridge!), so I've had no luck with that at all.
>
> Has anyone had success doing this? I've been searching for a solution
> for a couple of days now, I've lost hope that it can actually be done!
>
> -Seth
> --
> Seth Morabito
> Union City, CA, USA
> sethm at loomcom.com
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