Watchguard Firebox X20E Reference Manual page 54

PPP initialization strings
lcp-max-configure n
Set the maximum number of LCP configure-request transmissions to n
(default 10).
lcp-max-failure n
Set the maximum number of LCP configure-NAKs.
lcp-max-terminate n
Set the maximum number of LCP terminate-request transmissions to n
(default 3).
lcp-restart n
Set the LCP restart interval (retransmission time-out) to n seconds (default 3).
local
Don't use the modem control lines. With this option, pppd will ignore the
state of the CD (Carrier Detect) signal from the modem and will not change
the state of the DTR (Data Terminal Ready) signal.
maxconnect n
Terminate the connection when it has been available for network traffic for n
seconds (that is, n seconds after the first network control protocol comes up).
modem
Use the modem control lines. This option is the default. With this option,
pppd will wait for the CD (Carrier Detect) signal from the modem to be
asserted when opening the serial device (unless a connect script is specified),
and it will drop the DTR (Data Terminal Ready) signal briefly when the
connection is terminated and before executing the connect script.
netmask n
Set the interface netmask to n, a 32-bit netmask in decimal dot notation (for
example, 255.255.255.0). If this option is given, the value specified is ORed
with the default netmask. The default netmask is chosen based on the
negotiated remote IP address; it is the appropriate network mask for the class
of the remote IP address, ORed with the netmasks for any non-point-to-point
network interfaces in the system that are on the same network.
noauth
Do not require the peer to authenticate itself.
nobsdcomp
Disables BSD-Compress compression; pppd will not request or agree to
compress packets using the BSD-Compress scheme.
noccp
Disable CCP (Compression Control Protocol) negotiation. This option should
only be required if the peer is buggy and gets confused by requests from pppd
for CCP negotiation.
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