[Simh] NAT

[Ken Wiebe]

Hi Mark,

Thanks for pointing that out.  Duh.  I think I was up too late
last night.
Ken


On Wed, Sep 12, 2018, at 05:47, Mark Pizzolato wrote:
> Hi Ken,
> 
> The example you're using IS ALREADY mapping multiple ports.  It is
> mapping host port 2323 to simulated system port 23 AND host port 2121
> to simulated system port 21.  This maps telnet (on port 23) and ftp
> (on port 21).> 
> You can add additional mappings on the same command line up to some
> reasonably large command line length limit.> 
> - Mark
> 
> 
> On Sep 11, 2018 10:54 PM, Ken Wiebe <me at networkguy.com> wrote:
>> 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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