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SL(4) Device Drivers Manual SL(4)

sl
slip network interface

pseudo-device sl

The sl interface allows serial lines to be used as network interfaces using the slip protocol.
An sl interface can be created at runtime using the ifconfig slN create command or by setting up a hostname.if(5) configuration file for netstart(8).
The following link-level options are configurable via ifconfig(8):
link0
Use Van Jacobson TCP header compression.
link1
Suppress ICMP traffic.
link2
Auto-enable Van Jacobson TCP header compression (enabled by default).

sl0: afX not supported.
The interface was handed a message with addresses formatted in an unsuitable address family; the packet was dropped.

inet(4), netintro(4), hostname.if(5), ifconfig(8), ldattach(8), netstart(8), sliplogin(8), slstats(8)
April 23, 2014 OpenBSD-5.6