[Simh] VMS/VDE: Almost there

[Johnny Billquist]

Forgot to comment on one more thing...

On 2015-10-05 17:46, Jordi Guillaumes i Pons wrote:
>
>> I don't understand what you have done, but you appear to *not* have set up a virtual network on your MAC. Like I said before, WiFi do not work like ethernet, so this will not work.
>>
>> (The fact that your simh VAX is getting an address from a router, and you're talking about a bridge would suggest that you did not set up a virtual network.)
>>
>> When you set up a virtual network, you will have to set the MAC to route packets, and the MAC will be a router. You will need a separate IP network for this virtual network of yours, and if you plan to use DHCP, your MAC will need to act as a DHCP server.
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> Johnny, VDE works at layer 2 and has no idea about IP addressing or routing.
>
> What it does is to provide a virtual ethernet switch. You can “plug” things into this “switch” either using an API (that is what SIMH does) or using some VDE-provided utilities (which allow things like dumping all the packets into sysout, which can be piped to another vde switch using, for instance, a ssh tunnel).
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> What Zachary is doing is to use one of those plugs to get a “tap” interface plugged into the virtual switch, and then bridge that tap interface together with a physical interface; he is bridging with a WiFi adapter, which does not work for DECNET but should work for TCP/IP.

That was my point. This will not work.
Not even for TCP/IP. The problem is that WiFi is not ethernet. You 
cannot just have several machines bridged on one WiFi interface. It does 
not work.
This would in fact be identical to just let simh directly tap into the 
WiFi interface, which you can also do (no need for VDE at all), but it 
does not work with WiFi. It do work just fine with ethernet, though.

The point of using VDE would be to create a virtual network inside the 
machine, and then have the MAC route packets to/from WiFi to that 
virtual network.

*That* is what you need to do.

	Johnny

>
>> My VAX gets an IP address from the router, but can’t seem to ping it, nor any other addresses. DNS doesn’t work. Note that I’m not quite sure how to tell TCPIP services to get the name servers via DHCP.
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> Could you try to set up a static configuration in the VAX side and see if it works. Bridging to the wireless interface WILL NOT work with DECNET (even if you get adjacencies!), but should work with TCPIP.
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> I have not tried to use DHCP to configure IP on VMS. My virtual VAXen have static addresses and DNS servers and work without problem.
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> Anyway, if you post your SIMH, VMS and network configuration, I couls try to reproduce your setup and see if it works.
>
> BTW, are you using Compaq’s TCPIP or Multinet?
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