ppp.Devices.4 (2010 09)

p
ppp.Devices(4) ppp.Devices(4)
NAME
ppp.Devices - PPP physical device description file format
DESCRIPTION
The file
/etc/ppp/Devices
associates dialer types with physical devices and speeds.
pppd examines
it when placing a call to a neighboring machine. If no suitable speed is found, or if all devices associated
with that speed are busy,
pppd will try again later.
Format
Entries are one to a line; blank lines are ignored. Comments begin with a
# and extend to the end of the
line. Upper/lower case distinctions are significant. Fields on a line are separated by horizontal white
space (blanks or tabs).
Each entry must contain three or more fields, in this order:
dialer Either the string
Direct, or the name of the modem dialing chat script (found in
Dialers) to use with this device, or the name of an external dialer program.
device The name of the device in the
/dev directory (ttya, cua, etc.). Device names for Sna-
pLink connections are followed by a slash and the port number in use (
rsd2a/0, rrz4a/2,
etc.).
speed The baud rate of the synchronous connection, or a string to be matched against the speed
field of entries in
Systems when the Systems device field is set to ACU. Speeds must
either be valid async baud-rate numbers (as found in <sys/ttydev.h>
) or must begin
with them (2400, 38400, 19200-PEP, etc.), or must be speeds of which the SnapLink
hardware is capable (9600, 56000, 64000, 1536000, etc.)
optional parameters
Any special handling for this device. Currently supported values include:
xonxoff Specifies that the line be conditioned for in-band (software) flow control,
using the characters DC3 (ˆS, XOFF, ASCII 0x13) to stop the flow and
DC1 (ˆQ, XON, ASCII 0x11) to resume. The default is to use no flow con-
trol. For an outbound connection, this may be specified either in Dev-
ices or on the pppd command line.
internal-clocking
The SnapLink will provide the synchronous clock signal. By default, it
expects the modem, CSU/DSU or modem eliminator to provide the clock
signal. Internal-clocking cannot be used with RS-232 cables on the Sna-
pLink.
32-bit-fcs The SnapLink will calculate 32-bit FCS values for transmitted frames,
and check received frames with 32-bit FCS calculations. This is not
negotiable at connection establishment time. 32-bit FCS is only available
when running synchronous PPP on the SnapLink.
min-flags=minflags
The number of additional HDLC flag characters the SnapLink should
insert between data frames. The default and minimum is 2; the max-
imum is 16.
ignore-cd Ignore the state of the CD (Carrier Detect, also called DCD, Data Carrier
Detect) signal. This is useful for systems that don’t support CD but want
to run PPP over a dedicated line.
External Dailer
The external dialer program is run with the following arguments:
device name The contents of the Device field from the Devices entry.
speed The contents of the Speed field of the Systems and Devices entries.
telephone number The contents of the Phone Number field of the Systems entry.
optional parameters Copied from the Optional Parameters section of the Devices entry.
If the external dialer program exits with status 0, then the dial attempt is considered to have succeeded.
Any other exit status indicates a failure.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1