Watchguard Firebox X1000, Reference Manual

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CHAPTER 7: Out-of-Band Initialization Strings
92 WatchGuard Firebox System
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
Disables CCP (Compression Control Protocol) negotiation. This
option should be required only if the peer is buggy and gets
confused by requests from pppd for CCP negotiation.
nocrtscts
Disables hardware flow control (that is, RTS/CTS) on the serial
port. If neither the crtscts nor the nocrtscts option is given, the
hardware flow control setting for the serial port is left unchanged.
noipdefault
Disables the default behavior when no local IP address is
specified, which is to determine (if possible) the local IP address
from the hostname. With this option, the peer will have to supply
the local IP address during IPCP negotiation (unless it was
specified explicitly on the command line or in an options file).
nomagic
Disables magic number negotiation. With this option, pppd
cannot detect a looped-back line. This option should be needed
only if the peer is buggy.
nopersist
Exits once a connection has been made and terminated. This is the
default unless the persist or demand option has been specified.
novjccomp
Disables the connection-ID compression option in Van Jacobson—
style TCP/IP header compression. With this option, pppd will not
omit the connection-ID byte from Van Jacobson—compressed
TCP/IP headers, nor ask the peer to do so.
silent
Pppd does not transmit LCP packets to initiate a connection until
a valid LCP packet is received from the peer (as for the “passive”
option with older versions of pppd).