Why does ppp(8) lock up when I shell out to test it?

When you execute the shell or ! command, ppp(8) executes a shell (or if you have passed any arguments, ppp(8) will execute those arguments). Ppp will wait for the command to complete before continuing. If you attempt to use the PPP link while running the command, the link will appear to have frozen. This is because ppp(8) is waiting for the command to complete.

If you wish to execute commands like this, use the !bg command instead. This will execute the given command in the background, and ppp(8) can continue to service the link.

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