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PPP(4) Device Drivers Manual PPP(4)

Point-to-Point Protocol network interface

pseudo-device ppp

The ppp interface allows serial lines to be used as network interfaces using the Point-to-Point Protocol (PPP).
A ppp interface can be created at runtime using the ifconfig pppN create command or by setting up a hostname.if(5) configuration file for netstart(8).
The ppp interface can use various types of compression and has many advantages over the SLIP protocol used by the sl(4) interface.

ppp0: afX not supported
The interface was handed a message with addresses formatted in an unsuitable address family; the packet was dropped.

inet(4), sl(4), hostname.if(5), ifconfig(8), netstart(8), pppd(8), pppstats(8)

W. Simpson, The Point-to-Point Protocol (PPP), RFC 1661, July 1994.

The ppp device appeared in OpenBSD 1.2.

Currently, only the ip(4) protocol is supported.
June 2, 2013 OpenBSD-5.6