[Simh] how to get eth connexion

[Mark Pizzolato - Info Comm]

Hi Gérard,

On Sunday, November 03, 2013 at 10:50 PM, Gérard Calliet wrote:
> Hi Mark,
> 
> Thanks for your answer.
> 
> I tried the simh 4.0 beta. It's still not working.
> I join show ethernet result, ipconfig/all result, my ucx config, the init file.
> I choosed the right eth (eth0 is the active wifi interface on windows).
> I gave its mac address as interf mac address in the simh init file.

This is likely your key issue.  Attempting to get a simh simulator to use a Wifi network interface is likely to be a challenge.  Depending on details of how your simulated system is configured, it may be impossible.

I suggest that you try working with a Wired Network interface first and make sure you've to things working there BEFORE you explore the challenges of trying to 'share' the WiFi connection with your host operating system.

The issues with sharing the WiFi connection come down to several facts:  
1) the fact that the WiFi network expects ONLY a single MAC address to be transmitting from a single WiFi connection.
2) Normal windows WiFi network interfaces cannot operate in promiscuous mode, which means that they can only receive traffic destined for a single MAC address.

Depending on subtle details of your VMS system's configuration the Operating system and/or pieces of the network software will dynamically change the MAC address that is being used on the XQ or XU interface from the built in hardware MAC address (which you specify in the simh configuration file) to a DECnet form MAC address.  As mentioned above, a WiFi network connection will not expect (or work) with multiple MAC addresses, so this will be why things don't work.

On a windows system using a wired network connection, the following tests should be performed (and succeed):
1) PING the host computer's wired network IP address.
2) PING the router's IP address.
   If this doesn't succeed, then describe the firewall/anti-virus software installed on the windows system.
You should be able to use WireShark to watch your simulated system's network traffic.  Capturing with a capture filter of "ip host 192.168.1.222"
3) PING other devices on your network.
4) PING something beyond your router.

Let us know how far this gets.

- Mark
 
> I don't understand where is the problem. I am just a beginner on simh, so I
> could have done some error, but I don't see what it is.
> 
> Gérard Calliet
> pia-sofer