[Simh] NAT

[Ken Wiebe]

Hi,

I've successfully used "attach xq nat:" command with VAX, with and
without the tcp port mapping as shown in the example:
sim> attach xq nat:tcp=2323:10.0.2.15:23,tcp=2121:10.0.2.15:21

Questions though:

Even though it worked, I don't fully understand each part of the above
syntax.  Can someone break it down?
The only part that seems clear to me is the last piece, where you're
linking to the port (21) the emulated machine is listening on.  And I
know the 2323 is the port opened on localhost to map to 21.  But what is
the port 23 and port 2121 doing in the middle?
So if I wanted to add a map for SMTP (port 25), it would be this?

sim> attach xq nat:tcp=2327:10.0.2.15:27,tcp=2125:10.0.2.15:25

Also, How would one go about mapping multiple ports?

Can there be multiple "attach xq nat:" commands issued to
accomplish, i.e.:
sim> attach xq nat:tcp=2323:10.0.2.15:23,tcp=2121:10.0.2.15:21
sim> attach xq nat:tcp=2327:10.0.2.15:27,tcp=2125:10.0.2.15:25
etc.

Thanks!


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