I have found sources for the BBN stacks I believe. Could not figure out how to 
configure it and SIMH's emulation only speaks one protocol.

Sent from my iPhone

> On Mar 12, 2016, at 14:33, Henry Bent <[email protected]> wrote:
> 
>> On 12 March 2016 at 17:09, Bill Cunningham <[email protected]> wrote:
>>  
>> ----- Original Message -----
>> From: Clem Cole
>> To: Bill Cunningham
>> Cc: SIMH
>> Sent: Saturday, March 12, 2016 3:31 PM
>> Subject: Re: [Simh] [SimH] Networking support
>> 
>> Bill,
>> 
>> You probably need to date things a little and get a some perspective of 
>> where a few of us are coming.   Just to set a few lines in the sand.  While 
>> 3Mb/s "xerox" ethernet has been around for about 5 years, the 
>> DEC/Intel/Xerox Ethernet 10Mb/s spec was published Sep 30, 1980.   Per RFC 
>> 801, Arpanet was not officially schedule to switch from the old NCP to IP 
>> until Jan 1, 1983 (although a number of folks like me had been working with 
>> what would become IP/TCP for 3-4 years before that). 
>>  
>>     Oh Wow. I have always been told Jan 1st 1981 and they went from "Link 
>> Control Protocol" to TCP/IP. Must've been wrong then somebody was.
>>  
>> [...]
> Looking over RFC 801, it mentions a number of TCP/IP implementations.  Does 
> anyone know if source has survived for the BBN ones for Unix v6 and 4.1BSD?  
> Or the DCEC one, which I've never heard about?  I'm very interested in 
> bringing up TCP/IP support on historic versions of Unix.  I have both ARP and 
> non-ARP versions of 4.1C BSD running with a backported DEUNA driver, but 
> these would be even older than that.
> 
> Are there any plans to support the PDP-11 IMP interface boards in SIMH, which 
> would presumably then talk to the h316 simulator?
> 
> -Henry 
> 
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