ZyXEL Vantage CNM User Guide - Page 83
PPTP Encapsulation
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Chapter 5 Device Network Settings Table 22 Device Operation > Device Configuration > Network > WAN > WAN1/2 PPPoE (ZyNOS ZyWALL with two WAN ports) (continued) LABEL DESCRIPTION RIP Direction RIP (Routing Information Protocol) allows a router to exchange routing information with other routers. The RIP Direction field controls the sending and receiving of RIP packets. Choose Both, None, In Only or Out Only. When set to Both or Out Only, the Vantage CNM will broadcast its routing table periodically. When set to Both or In Only, the Vantage CNM will incorporate RIP information that it receives. When set to None, the Vantage CNM will not send any RIP packets and will ignore any RIP packets received. RIP Version By default, RIP Direction is set to Both. 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 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. 5.3.2.3 PPTP Encapsulation Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables secure transfer of data from a remote client to a private server, creating a Virtual Private Network (VPN) using TCP/IP-based networks. Vantage CNM User's Guide 83