PPP and SLIP

If you must link with a peer host that cannot use the point-to-point protocol, you can use PPP's SLIP option. SLIP, a non-standard but popular protocol, is really only a framing convention for arranging IP packets on a link. Many other PPP options are available when running the SLIP option. Automatic dialing, idle line hangup, packet filtering, the exec option, and most other management facilities can be invoked in conjunction with SLIP.

However, SLIP provides few of the advanced facilities available with the PPP protocol. pppd invoked with the SLIP option cannot provide the following functions:

Negotiations using link control protocol (LCP) and internet protocol control protocol (IPCP).
Authentication using password authentication protocol (PAP) and challenge handshake authentication protocol (CHAP).
Link quality monitoring (LQM).
Asynchronous control character mapping or the escape option.

There are also the following connection restrictions when running PPP with the SLIP option:

Links must be asynchronous.
Connections must be completely transparent to all 8-bit character values.
Flow control selection must be hardware only or no flow control at all.
Link must not interpret passing data as flow control.




	NOTE: Earlier releases of HP-UX supported SLIP and other serial line IP protocols with a facility called Point-to-Point Link (PPL), supplied with the LAN/9000 product. PPL did not support point-to-point protocol connections. If you are using SLIP to transfer data on serial IP lines, you can migrate your SLIP connections to PPP connections. Migrating SLIP to PPP connections is discussed in Chapter 3 of this manual.

PPP and SLIP

Technical documentation

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