[Simh] VAX DZ terminal controller unit?

[Peter Svensson]

Hi,

While the DZ emulation should work, I would like to comment on the network 
issues.

With TAP networking it is relatively easy to set up networking (using 
bridging) so that both hosts on the network and the host and the emulated 
CAX can see each other as if on a lan. Only one card is needed. This is 
how I run my virtual VAXen to bootstrap the real ones. (Actually I run a 
cluster of two emulated VAXen to test cluster boot).

Peter



On Thu, 19 May 2011, Gary Lee Phillips wrote:

> On Thu, May 19, 2011 at 6:37 PM, David Holland
> <david.w.holland at gmail.com> wrote:
> > If all you're wanting to do is simply telnet into the VAX...
> >
> > Assuming a recent Linux kernel
> >
> > Bridge devices, and veth type devices will work wonders to get the VAX on
> > the LAN.
> >
> > See:
> >
> > http://comments.gmane.org/gmane.comp.emulators.simh/420  (or search the
> > archives)
> >
> > As a good starting point....  Obviously, I've used them at one point..
> >
> 
> Thanks, but the VAX is already on the LAN. That isn't the issue. I
> compiled with network support, and the XQ device is attached and
> working. The thing is, the host machine has only one NIC. The VAX and
> the Linux system share the NIC well enough, each with its own IP
> address and MAC address. Connecting from an outside, independent
> machine is fine and works for both systems just as if they were
> separate, real machines. Both can also originate connections to other
> points on the LAN or the Internet. The problem comes when I want to
> connect to the virtual VAX from the host Linux system. That cannot be
> accomplished by a normal LAN connection because they can't see each
> other: when one has control of the NIC, the other does not. I thought
> this was the main use of the DZ emulator, as I read the description.
> It makes a telnet connection to a port on the host operating system
> look like a serial port connection on the VAX side. Thus it allows
> direct terminal access from the host machine to the virtualized guest
> system. It also works even if the SIMH-VAX module was compiled WITHOUT
> actual network support, and I've used it that way in the past.
> 
> --Gary
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> 

Peter
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