Fig. 1 SAME IDENTITY, SIGNED, NEW ADDRESS

Supgang shares changing addresses among computers you control, without an outside account, directory or relay.

Unreleased 0.2.0 alpha passed between two Macs over IPv4 with an owner-configured port forward. Recovery after the home address changes is unproven; published 0.1.0 is not a working wide-area release.

Basic use

$ supgang
laptop [8d41c2af]  this computer
  local  192.168.1.24:44330  preferred

home-server [31be907c]  connected
  local  192.168.1.40:44330  preferred
  public 203.0.113.40:44330

$ supgang home-server
home-server [31be907c]  connected
  local  192.168.1.40:44330  preferred
  public 203.0.113.40:44330

$ supgang tag home-server server
Tagged home-server [31be907c] as server.

The default command lists every computer. A name, tag or partial match narrows the result.

How it stays in touch

On the same network it prefers a local address; elsewhere it tries a public one. Each computer signs its address updates before peers relay them. Old signed addresses are kept for recovery.

An optional always-on computer you own can help separated peers reconnect.

Limit: if every computer is unreachable at every address the others know, an update has nowhere to go.