Re: SIMH - networking

From: Martin Vorlaender (martin_at_radiogaga.harz.de)
Date: 11/20/04 

Date: Sat, 20 Nov 2004 07:37:07 +0100

Gremlin <not-here@all.mate> wrote:
> Could I get a little assistance please...
>
> I have read the doco and FAQs and understand why SIMH cant talk on the same
> interface as the one used by Windows, but, how do I configure a second
> physical card in the box? For example, under Windows do I disable the card
> to stop windows from trying to use it and then in SIMH vax.ini tell it to
> use the MAC address of the disabled card? Will the card work if it is
> disabled in Windows? If I don't disable the card, how is it different from
> the original card, other than having a different MAC address?
>
> Any help appreciated.

SIMH on Windows (on any network-enabled platform, AFAIK) uses the pcap
library to talk to the network. It uses a virtual network card - that's
why you are free to setup a MAC address for SIMH's XQ device.

The pcap library uses promiscuous mode to catch all packets going
through the network card to filter out those for SIMH's network device
(i.e. MAC address).

All of this is unrelated to whether or how Windows uses the network card.
I guess, however, that you have to have Windows load the driver, at least.

You configure which real network card pcap uses by the ATTACH command
like

  simh> ATTACH XQ <your network card's name>

You can find all network cards detected by SIMH and their names using

  simh> SHOW XQ ETH

cu,
  Martin 

-- 
One OS to rule them all       | Martin Vorlaender  |  OpenVMS rules!
One OS to find them           | work: mv@pdv-systeme.de
One OS to bring them all      |   http://www.pdv-systeme.de/users/martinv/
And in the Darkness bind them.| home: martin@radiogaga.harz.de

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