Intellinet Network Solutions 523967 - Manual (Page 52)

2-5-4 Setup procedure for 'PPTP':
PPTP requires two kinds of settings: WAN interface setting (setup IP
address) and PPTP setting (PPTP user name and password). Here we start
with the WAN interface setting:
Select how you obtain an IP address from your service provider here. You
can choose 'Obtain an IP address automatically' (equal to DHCP, refer to
the 'Cable Modem' section above), or 'Use the following IP address' (i.e.,
static IP address).
WAN interface settings must be correctly set or the Internet connection
will fail even if the PPTP settings are correct. Contact your Internet
service provider if you don't know how you should fill in these fields.
Go to PPTP settings section next.