Setting up SNA networking with Hercules using DLSw

I finally broke down and made a quick video on setting up the DLSw ‘lab’ that I had uploaded on Internet Archive.

See it works!

Although I should have gone more in depth with the cisco part.

Namely showing how to check the interfaces, the ethernet l2 traffic, how the DLSw peers, and then the establishment of the circuit once the session is established.

But I wanted to be quick. I don’t think I can edit a video that is up so I’ll probably follow it up with another quick video.

simple network diagram

Trying to put it into words, the Windows 3.1 VM hosts Extra! 4.2 talking SNA to the Loop_SNA virtual Ethernet interface, which then is connected to the virtual cisco router, which also has a TCP/IP enabled interface, Loop_TCPIP, which the host Windows 10 machine can talk to, allowing it to communicate with the Hercules VM which I had compiled to run as a native Win64 EXE for Windows.

Basically, at it’s heart, this is the important part of the cisco config:

source-bridge ring-group 1
dlsw local-peer peer-id
dlsw remote-peer 0 tcp
dlsw mac-addr 4000.1020.0100 remote-peer ip-address
dlsw udp-disable
dlsw transparent switch-support

interface FastEthernet0/0
 ip address
 no shut

interface Ethernet1/0
 dlsw transparent redundancy-enable 5555.5555.5000
 dlsw transparent map local-mac 4000.1020.0100  remote-mac 4000.0999.0100
 no shut

I used a ‘clean’ VMware virtual machine to host this test, just to show how to do the setup from scratch, taking nothing for granted.

Hopefully this explains it a bit better for those who wanted to know, along with the video to show the high level of it working. Not sure anyone would want to watch me stumble through setting up MVS, along with going into more detail on the cisco config & workstation config.

As always, thanks to 9track for providing the patches, and showing that this whole setup was possible!

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