ZyXEL Communications G.SHDSL.bis 4-port Security Gateway P-793H - Manual (Page 90)

P-793H User’s Guide
90 Chapter 5 WAN Setup
The following table describes the labels in this screen.
Table 21 WAN > WAN Backup Setup > Advanced Setup
LABEL DESCRIPTION
Basic
Authentication
Type
Use the drop-down list box to select an authentication protocol for outgoing calls.
Options are:
CHAP/PAP - Your ZyXEL Device accepts either CHAP or PAP when requested by
this remote node.
CHAP - Your ZyXEL Device accepts CHAP only.
PAP - Your ZyXEL Device accepts PAP only.
Secondary Phone
Number
Type the backup phone number from the ISP. If the Primary Phone number is busy
or does not answer, your ZyWALL dials the Secondary Phone number, if available.
Some areas require dialing the pound sign # before the phone number for local
calls. Include a # symbol at the beginning of the phone numbers as required.
Dial Backup Port
Speed
Select the speed of the connection between the Dial Backup port and the external
device. Available speeds are 9600, 19200, 38400, 57600, 115200 or 230400 bps.
AT Command
Initial String
Enter the AT command string to initialize the WAN device. Consult the manual of
your WAN device connected to your Dial Backup port for specific AT commands.
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.