ZyXEL Communications Vantage CNM 2.3 User Manual page 80

Chapter 5 Device Network Settings
Table 21 Device Operation > Device Configuration > Network > WAN > WAN1/2
(ZyNOS ZyWALL with two WAN ports) (continued)
LABEL
RIP Version
Multicast
Version
Apply
Reset
5.3.2.2 PPPoE Encapsulation
PPPoE (Point-to-Point Protocol over Ethernet) is an IETF standard (RFC 2516)
specifying how a personal computer (PC) interacts with a broadband modem
(DSL, cable, wireless, etc.) connection. The PPPoE 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 device (rather than individual computers),
the computers on the LAN do not need PPPoE software installed, since the device
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DESCRIPTION
The RIP Version field controls the format and the broadcasting method
of the RIP packets that the Vantage CNM sends (it recognizes both
formats when receiving).
Choose RIP-1, RIP-2B or RIP-2M.
RIP-1 is universally supported; but RIP-2 carries more information.
RIP-1 is probably adequate for most networks, unless you have an
unusual network topology. Both RIP-2B and RIP-2M sends the routing
data in RIP-2 format; the difference being that RIP-2B uses subnet
broadcasting while RIP-2M uses multicasting. Multicasting can reduce
the load on non-router machines since they generally do not listen to
the RIP multicast address and so will not receive the RIP packets.
However, if one router uses multicasting, then all routers on your
network must use multicasting, also. By default, the RIP Version field
is set to RIP-1.
Choose None (default), IGMP-V1 or IGMP-V2. 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.
IGMP version 2 (RFC 2236) is an improvement over version 1 (RFC
1112) but IGMP version 1 is still in wide use. If you would like to read
more detailed information about interoperability between IGMP version
2 and version 1, please see sections 4 and 5 of RFC 2236.
Click this to save your changes back to the Vantage CNM.
Click this to begin configuring this screen afresh.
Vantage CNM User's Guide