User's Manual

Chapter 5 WAN Setup
P-793H User’s Guide
90
Advanced
Modem Setup
Click Edit to change the advanced settings for the modem.
TCP/IP Options
Metric This field sets this route's priority among the routes the ZyXEL Device uses.
The metric represents the "cost of transmission". A router determines the best
route for transmission by choosing a path with the lowest "cost". RIP routing uses
hop count as the measurement of cost, with a minimum of "1" for directly
connected networks. The number must be between "1" and "15"; a number greater
than "15" means the link is down. The smaller the number, the lower the "cost".
Enable SUA Select this if you have one public IP address and want to use NAT, or clear it to
disable NAT.
Enable RIP Select this if you want to enable RIP in the dial-backup connection. RIP (Routing
Information Protocol, RFC 1058 and RFC 1389) allows a router to exchange
routing information with other routers. Clear this if you want the ZyXEL Deviceto not
send any RIP packets and to ignore any RIP packets received.
RIP Version The RIP Version field controls the format and the broadcasting method of the RIP
packets that the ZyXEL Device sends (it recognizes both formats when receiving).
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 The RIP Direction field controls the sending and receiving of RIP packets. Select
the RIP direction from Both/In Only/Out Only. When set to Both or Out Only, the
ZyXEL Device will broadcast its routing table periodically. When set to Both or In
Only, it will incorporate the RIP information that it receives.
Enable Multicast Select this if you want to enable IGMP in the dial-backup connection. IGMP
(Internet Group Multicast Protocol) is a network-layer protocol used to establish
membership in a multicast group.
Multicast The ZyXEL Device supports both IGMP version 1 (IGMP-v1) and IGMP-v2.
PPP Options
Encapsulation Select CISCO PPP from the drop-down list box if your dial backup WAN device
uses Cisco PPP encapsulation, otherwise select Standard PPP.
Compression Select this to turn on stac compression.
Connection
Nailed-Up
Connection
Select Nailed-Up Connection when you want your connection up all the time. The
ZyXEL Device will try to bring up the connection automatically if it is disconnected.
Connect on
Demand
Select Connect on Demand when you don't want the connection up all the time
and specify an idle time-out in the Max Idle Timeout field.
Max Idle Timeout Specify an idle time-out in the Max Idle Timeout field when you select Connect on
Demand. The default setting is 0, which means the Internet session will not
timeout.
Budget
Allocated Budget
Enter the maximum amount of time (in minutes) each call can last. Enter 0 if there
is no limit. With Period, you can set a limit on the total outgoing call time of the
ZyXEL Device within a certain period of time. When the total outgoing call time
exceeds the limit, the current call will be dropped and any future outgoing calls will
be blocked.
Table 22 WAN > WAN Backup Setup > Advanced Setup (continued)
LABEL DESCRIPTION