ZyXEL Vantage CNM User Guide - 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 DESCRIPTION RIP Version 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. Multicast Version Apply Reset 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. 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 80 Vantage CNM User's Guide