ZyXEL Communications P-660HN-F1A, User Manual

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Chapter 6 WAN Setup
P-660HN-F1A User’s Guide
106
6.1.2 What You Need to Know About WAN
Encapsulation Method
Encapsulation is used to include data from an upper layer protocol into a lower
layer protocol. To set up a WAN connection to the Internet, you need to use the
same encapsulation method used by your ISP (Internet Service Provider). If your
ISP offers a dial-up Internet connection using PPPoE (PPP over Ethernet) or PPPoA,
they should also provide a username and password (and service name) for user
authentication.
WAN IP Address
The WAN IP address is an IP address for the P-660HN-F1A, which makes it
accessible from an outside network. It is used by the P-660HN-F1A to
communicate with other devices in other networks. It can be static (fixed) or
dynamically assigned by the ISP each time the P-660HN-F1A tries to access the
Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the
subnet mask and DNS server IP address(es) (and a gateway IP address if you use
the Ethernet or ENET ENCAP encapsulation method).
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1
sender - 1 recipient) or Broadcast (1 sender - everybody on the network).
Multicast delivers IP packets to a group of hosts on the network - not everybody
and not just one.
IGMP
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to
establish membership in a Multicast group - it is not used to carry user data.
There are three versions of IGMP. IGMP version 2 and 3 are improvements over
version 1, but IGMP version 1 and 2 are still in wide use.
Finding Out More
See Section 6.5 on page 121 for technical background information on WAN.
6.1.3 Before You Begin
You need to know your Internet access settings such as encapsulation and WAN IP
address. Get this information from your ISP.