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IMPVAX is a DEC VAXserver 3900 running OpenVMS 7.3. It speaks DECnet and Internet Protocol (IP). It is named to honor IMP - the first internet router. It lives inside a SIMH hypervisor in a AWS EC2 instance in Amazon's Virginia data center.

IMPVAX is a DECnet Phase IV Area Router serving as the United States East gateway to HECnet - the hobbyist DECnet network. It is also the Routing Node for all Digital and non-Digital systems communicating over DECnet at SANYALnet Labs. It runs Process Software's MULTINET to communicate with other DECnet nodes and uplink to HECnet. It additionally uses a VDE (Virtual Distributed Ethernet) switch to communicate with rest of the DECnet nodes in my home.

If you want to conenct to HECnet via IMPVAX, you can do one of two things:

In either case, get in touch with me when you are ready to connect to IMPVAX and join DECnet nodes across the world.

Here are the basic steps to have a SIMH VAX running OpenVMS 7.3 with licenses for OpenVMS and Layered Products.

HECnet members can contact me for an account.

SANYALnet Labs

That is just a name I have given my disorganized bunch of computers and electronics hobby projects; it is nebulous and does not really mean anything. Equivalent to "junk in the basement."

DECnet - MAC address - SCSSYSTEMID Calculator

Here is a DECnet administrator's tool in javascript: DECnet - MAC address - SCSSYSTEMID Calculator »


The hobbyist servers I play with and the services they provide are listed at my Freeshell / SDF Web Page.

SANYALnet Labs System Monitor: Latest Notification Events


Supratim Sanyal


This is a private hobbyist server with potentially everything being logged. There is absolutely no assurance of any kind whatsoever, no assumptions can be made about any sort of privacy, security, availability and retention of data. This generally applies to all my hobbyist servers mentioned here and elsewhere.

Free counters!