ZyXEL Communications 792H - Manual (Page 96)

Prestige 792H G.SHDSL Router
5-16 WAN
Table 5-3 Advanced WAN Backup
LABEL DESCRIPTION
Enable SUA Network Address Translation (NAT) allows the translation of an Internet protocol
address used within one network to a different IP address known within another
network.
SUA (Single User Account) is a subset of NAT that supports two types of
mapping: Many-to-One and Server. When you select this option the Prestige will
use Address Mapping Set 255 in the SMT (see the section on menu 15.1 for
more information).
Enable RIP Select this check box to turn on RIP (Routing Information Protocol), which allows
a router to exchange routing information with other routers.
RIP Version The RIP Version field controls the format and the broadcasting method of the
RIP packets that the Prestige 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 Prestige will broadcast its routing table
periodically.
When set to Both or In Only, the Prestige will incorporate RIP information that it
receives.
Enable Multicast Select this check box to turn on IGMP (Internet Group Multicast Protocol). IGMP
is a network-layer protocol used to establish membership in a Multicast group - it
is not used to carry user data.
Multicast 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.