NAME
slattach —
attach serial lines as
network interfaces
SYNOPSIS
slattach |
[-Hhlmn]
[-s
baudrate]
[-t ldisc]
ttyname |
DESCRIPTION
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) or
strip(4) interfaces. These
interfaces have to be created using the
ifconfig(8)
create subcommand before the
slattach
command. The network source and destination addresses and other interface
parameters are configured via
ifconfig(8).
The following operands are supported by
slattach:
-
-
- -H
- Turn on DTR/CTS flow control. By default, no flow control
is done.
-
-
- -h
- Turn on RTS/CTS flow control. By default, no flow control
is done.
-
-
- -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. Supported
line disciplines are “slip” (creates a
sl(4) instance) and
“strip” (creates a
strip(4) instance). If this
option is not specified, the default is “slip”.
-
-
- 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).
EXAMPLES
slattach ttyh8
slattach -s 4800 /dev/tty01
DIAGNOSTICS
Messages indicating that the specified interface is not configured or created,
the requested address is unknown, or that the user is not privileged but tried
to alter an interface's configuration.
SEE ALSO
netstat(1),
daemon(3),
netintro(4),
sl(4),
strip(4),
ifconfig(8),
rc(8),
sliplogin(8),
slstats(8)
HISTORY
The
slattach command appeared in
4.3BSD.
BUGS
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
slattach
command.