CMU TCP/IP (VAX)

4 thoughts on “CMU TCP/IP (VAX)”

  1. Hi
    I installed the software on a VAX4000 (real hardware, no emulation) but I think I made a mistake during the setup procedure. Where are the TCP/IP configuration files located? I think I have to change the gateway…

    1. Sorry for the late reply, but I believe the best option – which you have probably figured out by now – is to re-run the install script, which is what I have done previously.

      I believe the configuration files are located under SYS$SYSTEM, but are not designed to be hand edited. In other words, edit at your own risk!

  2. There’s a typo in step 8:
    BACKUP [.CMUIP_B]*.*; CMUIP066.B/SAVE_SET

    The semicolon should be omitted. The first time I tried this, the installation failed because the patch was nullified by the semicolon.

    Thanks for letting me know! You are correct, I will fix this on the site.

  3. > How would I harden the networking environment to prevent hacking opportunities?

    Not sure that I can provide much advice here, other than to say that if you follow the network configuration I have documented / suggested (https://www.openvmshobby.com/openvms-simulator-network/), that there will be no direct network connectivity between the VM machines running OpenVMS and the rest of your network. In this configuration, there is a Linux VM (dual-hosted vmsnet 192.168.1.100 / 192.168.100.100) that sits between your “real” network (here as 192.168.1.0/255) and the “internal” OpenVMS network (here as 192.168.100.0/255). Of course, your network addresses may vary, but hopefully you get the idea. So the only traffic that you have between the OpenVMS network and the rest of the world is only what you let through that Linux VM.

    So if you want to let some traffic through, it is only what you explicitly configure on the Linux VM (vmsnet in my diagram). For that, you can use IP Tables — or any of a dozen other Linux firewall programs — to control what traffic is permitted, and what is filtered. By default, nothing will get through unless you expressly permit it.

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