ZyXEL ZyWALL 5 User Guide - Page 201
The Advanced Modem Setup Screen
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Chapter 9 WAN Screens Table 47 NETWORK > WAN > Dial Backup (continued) LABEL DESCRIPTION RIP Version The RIP Version field controls the format and the broadcasting method of the RIP packets that the ZyWALL 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. 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, In Only or Out Only. When set to Both or Out Only, the ZyWALL will broadcast its routing table periodically. When set to Both or In Only, the ZyWALL will incorporate RIP information that it receives. Broadcast Dial Backup Route Select this check box to forward the backup route broadcasts to the WAN. Enable Multicast Select this check box to turn on IGMP (Internet Group Management Protocol). IGMP is a network-layer protocol used to establish membership in a Multicast group - it is not used to carry user data. Multicast Version Select IGMP-v1 or IGMP-v2. 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. Budget Always On Select this check box to have the dial backup connection on all of the time. Configure Budget Select this check box to have the dial backup connection on during the time that you select. Allocated Budget Type the amount of time (in minutes) that the dial backup connection can be used during the time configured in the Period field. Set an amount that is less than the time period configured in the Period field. Period Type the time period (in hours) for how often the budget should be reset. For example, to allow calls to this remote node for a maximum of 10 minutes every hour, set the Allocated Budget to 10 (minutes) and the Period to 1 (hour). Idle Timeout Type the number of seconds of idle time (when there is no traffic from the ZyWALL to the remote node) for the ZyWALL to wait before it automatically disconnects the dial backup connection. This option applies only when the ZyWALL initiates the call. The dial backup connection never times out if you set this field to "0" (it is the same as selecting Always On). Apply Click Apply to save your changes back to the ZyWALL. Reset Click Reset to begin configuring this screen afresh. 9.7.1 The Advanced Modem Setup Screen Click the Edit button in the Dial Backup screen to display the Advanced Setup screen. Use this screen to configure your advanced modem setup settings for the Dial Backup screen. ZyWALL 5/35/70 Series User's Guide 201