[Simh] how to get eth connexion

[Mark Pizzolato - Info Comm]

On Wednesday, November 06, 2013 at 12:49 AM, Gérard Calliet wrote:
> Le 05/11/2013 13:55, Mark Pizzolato - Info Comm a écrit :
> >> 2) I saw we need at least one ip host connexion alive to have a
> >> connexion for
> >> >simh - I am on Windows with wincap -. Again, why ?
> > I'm not sure exactly what you mean by 'need at least one ip host connexion
> alive'.  Are you saying that you need to be connected to a network?
> Thanks to your help, I was able to communicate using a classic wire
> connexion. It works also with the only wire interface, used by Windows for ip
> traffic, and by simh for its (ip also) traffic.
> If I disable the ip protocol for the interface, simh also cannot work.
> My question is theoretical : why do we need an ip host protocol on the host
> interface for simh being able of work with this interface ? It's perhaps a
> window / wincap issue.

That is a good question.  

You certainly should be able to run a simh simulator using a network interface which the host system isn't using for IP traffic.  I have done this in the past.  In fact, prior to simh v3.9, using an extra network interface (one dedicated to simh) was the only way the simulated system could talk to its host system via IP.  

The key requirement is that the dedicated interface MUST be enabled and active/on.  WinPcap does not have any way to "turn an interface on", so you may need some low level protocol enabled on the interface to act as a place holder to turn on the interface.  IP certainly is sufficient to perform this task, but several other "Protocols" which windows 

At this time, I no longer run simh simulators on Windows using the additional interface since, while implementing the DELQA-T I found the issue (for Windows) which didn't allow a simh simulator to share the network interface AND to talk to the host as well.  That works now.  On non-windows platforms, the problem still is an issue, but there now built in support for other ways to work around this issue (with internal bridging and/or VDE).

- Mark

> Don't worry about it : it is only to increese my knowledge. I do go on with
> wired and ip-ed solutions.
> 
> Gérard Calliet
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