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SLATTACH(8) NetBSD System Manager's Manual SLATTACH(8)
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slattach -- attach serial lines as network interfaces
slattach [-Hhlmn] [-s baudrate] [-t ldisc] ttyname
slattach is used to assign a tty line to a network interface which uses
asynchronous serial lines.
Currently the slattach command is used to attach sl(4) interfaces. These
interfaces have to be created using the ifconfig(8). The resulting
point-to-point link is not a broadcast interface and normally has a net-
mask of 255.255.255.255. create subcommand before the slattach command.
The network source and destination addresses and other interface parame-
ters are configured via ifconfig(8).
The following operands are supported by slattach:
-H Turn on DTR/CTS flow control. By default, no flow control
-h Turn on RTS/CTS flow control. By default, no flow control
-l Turn on the CLOCAL flag, making it possible to run SLIP on
a cable without modem control signals (e.g. DTR, DSR, DCD).
-m Maintain modem control signals after closing the line.
Specifically, this disables HUPCL.
-n Don't detach from invoking tty.
-s baudrate Specifies the speed of the connection. If not specified,
the default of 9600 is used.
-t ldisc Specifies the line discipline to use for the tty. Sup-
ported line disciplines are ``slip'' (creates a sl(4)
instance). If this option is not specified, the default is
``slip''. This option is retained for backwards compati-
bility with existing scripts.
ttyname Specifies the name of the tty device. ttyname should be a
string of the form `ttyXX', or `/dev/ttyXX'.
Only the super-user may attach a network interface.
To detach the interface, use ``ifconfig interface-name down'' after
killing off the slattach process. Interface-name is the name that is
shown by netstat(1).
Lock, initialize, and attach a line (on both sides):
cu -t -F [hard|soft] -l /dev/dty00
ifconfig sl0 create
slattach -l -t slip /dev/dty00
On the local side:
ifconfig sl0 inet 10.0.0.2 10.0.0.1 netmask 255.255.255.255
On the remote side:
ifconfig sl0 inet 10.0.0.1 10.0.0.2 netmask 255.255.255.255
Messages indicating that the specified interface is not configured or
created, the requested address is unknown, or that the user is not privi-
leged but tried to alter an interface's configuration.
netstat(1), daemon(3), netintro(4), sl(4), ifconfig(8), rc(8),
The slattach command appeared in 4.3BSD.
There is no way to specify the interface name (sl%d etc.) to be attached
by the slattach command. There is no way to see which interface is
assigned to the specified tty by the slattach command, either.
It would be better if the network interfaces were created by the slattach
command rather than by using the ifconfig(8) create subcommand before the
NetBSD 9.99 January 18, 2020 NetBSD 9.99