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C
H A P T E R
Use these screens to set up the P-2024 on the WAN. You can configure the Internet connection
and DNS servers.
5.1 WAN Overview
5.1.1 PPPoE Encapsulation
The P-2024 supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is an IETF
standard (RFC 2516) specifying how a personal computer (PC) interacts with a broadband
modem (DSL, cable, wireless, etc.) connection. The PPP over Ethernet option is for a dial-
up connection using PPPoE.
For the service provider, PPPoE offers an access and authentication method that works with
existing access control systems (for example Radius).
One of the benefits of PPPoE is the ability to let you access one of multiple network services,
a function known as dynamic service selection. This enables the service provider to easily
create and offer new IP services for individuals.
Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires
no specific configuration of the broadband modem at the customer site.
By implementing PPPoE directly on the P-2024 (rather than individual computers), the
computers on the LAN do not need PPPoE software installed, since the P-2024 does that part
of the task. Furthermore, with NAT, all of the LANs' computers will have access.
5.1.2 WAN IP Address Assignment
Every computer on the Internet must have a unique IP address. If your networks are isolated
from the Internet, for instance, only between your two branch offices, you can assign any IP
addresses to the hosts without problems. However, the Internet Assigned Numbers Authority
(IANA) has reserved the following three blocks of IP addresses specifically for private
networks.
Table 16 Private IP Address Ranges
10.0.0.0
172.16.0.0
192.168.0.0
P-2024 User's Guide
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10.255.255.255
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172.31.255.255
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192.168.255.255
5
WAN
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