SLIP and PPP Interoperability

The command_name option in the ppl.remotes file for SLIP allows the execution of a ppl command on the called host. For an HP-UX system running SLIP to communicate seamlessly with an HP-UX 10.30 system running PPP in SLIP mode, either the command_name option must be changed to execute pppd or the 10.30 system must recognize a ppl command and be able to convert that to a corresponding pppd command. The PPP product supplies a script called ppl which translates the ppl command to a pppd command. It only converts inbound connections (ppl -i). If the user attempts to make an outbound connection (ppl -o) using ppl, an error message is issued telling the user that pppd must be used.

For pppd commands that make an outbound connection to a pre-HP-UX 10.30 SLIP system, the slip option must be used in the pppd command line. To start the inbound connection on the called host (SLIP host), the chat_script in /etc/ppp/Systems must be set up to execute a ppl command after login or the called host must setup execution of the ppl command after login (like in a Login script similar to what pppd does). It is the responsibility of the system administrator to do this setup.