Installation guide

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pppauth={none|chap|pap|both}
Determines whether authentication is required for PPP connection
and, if so, what kind.
none
The remote user does not require PPP authentication
chap
Challenge Handshake Authentication Protocol (CHAP)
authentication is required.
pap
Password Authentication Protocol(PAP) authentication is
required.
both
Both CHAP and PAP authentication are required.
The default is “none”
ipaddrmode={ippool|negotiated|static}
The mode of IP address for the peer in an incoming PPP connection.
ippool
The IP address of remote peer will be assigned from the
ippool automatically.
negotiated
Allow remote peer to specify remote IP address.
static
The specified IP address for remote peer will be used.
ipaddr=ip address
The IP address of remote peer to be used if the ipaddrmode=static
phonenumber1=phone number
The primary phone number to dial to request PPP connection.
phonenumber2= phone number
The secondary phone number to dial to request PPP connection. If the
line of primary phone number is busy, secondary phone number will
be used automatically.