/etc/ppp/ppp.conf options:
set device DEVICE
	The device ppp uses to connect. "/dev/cuaa1"

set speed SPEED
	Connection speed. Ex: 57600 or 115200

set timeout N
	Idle time in seconds before disconnecting.

set dial STRING
	The modem init and dial string. Ex.
	"ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" \
	ATE1Q0M0 OK-AT-OK\\dATDT\\T TIMEOUT 40 CONNECT"

set redial RETRIES WAIT
	Set the number of times to attempt to redial and the time
	to wait between each attempt in seconds. Ex. set redial 3 10

set phone NUMBER
	The telephone number to dial. You can specify multiple phone
	numbers to use seperated by either a ":" or "|". Each number
	will be tried in order until a successful connection negotiated.

set authname USERNAME
	The username provided by your ISP or network administrator.
	This is required for either PAP or CHAP authentication.

set authkey PASSWORD
	The password provided by your ISP or network administrator.
	This option is required for either PAP or CHAP authentication
	but is also useful if you authenticate with the chatscript.

add default HISADD
	This option is used for dynamic IP address assignment. The
	HISADD is not an option but a variable that stands for the
	IP address assigned by the ppp negotiation process.

enable dns
	This option is used for assigning the DNS servers that your
	ISP provides in the ppp negotiation process. With this option
	enabled, your "/etc/resolv.conf" file will be overwritten with
	the IP addresses provided. This option is not needed if you
	are running your own DNS server or use DNS servers other than
	the ones provided by your ISP.
	Do NOT do this if you are running a local DNS unless you also
	either use "resolv readonly" or have "resolv restore" in
	"/etc/ppp/ppp.linkdown", as ppp will simply circumvent its
	use by entering some nameserver lines in "/etc/resolv.conf".

alias enable yes
	This option enables the machine to use NAT (aka: Masquerading,
	IP Aliasing, etc..) which will allow your machine to function
	as a network gateway.
	This option will alleviate the needed to call ppp with the
	"-alias" flag for IP aliasing.

resolv readonly
resolv restore
set openmode active
accept chap