On Aug 16, 2023, at 11:21 PM, John H. Reinhardt 
 <johnhreinhardt(a)thereinhardts.org> wrote:
 So Mark (Matlock) has been after me to get my HECnet connection up 
 and running and me, being an ace procrastinator, has always said 
 "Real Soon Now™", Mark.
 I might actually have time to do it as I'm on vacation for a week and 
 a half.  Despite the heat I could set something up.  My question is 
 how do I set it up.  I have a Mac Mini in Las Vegas running VMWare 
 ESXi.  I have a VM (Aniketos) running Vyos for a firewall/router, 
 another VM with an Nginx web server (Hermes - irrelevant just 
 mentioned for completeness) and a really small (1 vCPU) Linux VM 
 (Knight) which I want to run Paul's PyDECnet router for the world to 
 connect to.  From there I have an IPSec VPN to my Ubiquiti EdgeRouter 
 4 at home.  How can I connect DECnet through the VPN to Knight from 
 home?  Is it even possible?  Do I need or want GRE tunnels through 
 the VPN?
 Am I just making it too complicated and should I set up a PyDECnet 
 router at home and go that way through my dynamic IP? It's possible I 
 could set up an x86 OpenVMS machine as another VM
 I'm thinking I need a PyDECnet router at home to collect all the 
 DECnet traffic and shove it through the VPN to the PyDECnet router at 
 the remote site and from there out into the internet to it's HECnet 
 connection points.  Does that make sense? 
 A router at home that uses the dynamic
IP address is certainly a valid 
 option, one a bunch of us use today.
 I don't know that anyone has tried running a DECnet circuit through an 
 IPSec VPN, but clearly it should work.  You'd just point the DECnet 
 circuit to the IP address of the other end of the tunnel, with the 
 local address of the circuit set to the local endpoint of the tunnel.  
 Then you can use any IP based communication method that is enabled by 
 the filter rules of the VPN.  For example, if the VPN allows any IP 
 traffic, you could use anything IP based, from GRE to Multinet to 
 DDCMP.  If you want to be more restrictive, you could enable justthe 
 one protocol and port you want.  For example, that could be TCP on 
 which you run Multinet, or TCP or UPD carrying DDCMP.
 If you do go this VPN route it would be interesting to hear how it 
 works for you, especially if you run into problems.
     paul
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 Thanks Johnny and Paul!
 
 I do at least want to try the connection through the VPN. I'm curious if 
 it works as well.  The VPN connection has been very reliable for TCP 
 traffic but it's not heavily loaded.  I keep a "top" session running on 
 each system there just to see if/when it breaks.  It has typicallygone 
 months without a problem other than when we have had extended power 
 outages or my local internet has gone down.
 
 I don't have Multinet anywhere (yet) so I will try the DDCMP via TCP. 
 That seems the most reasonable place to start.
 
 John H. Reinhardt
 
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