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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; when set to None, it will not send any RIP packets and will
ignore any RIP packets received.
RIP Version 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 send 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, RIP Direction is set to Both and RIP Version to RIP-1.
5.3.4 Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient) or Broadcast
(1 sender - everybody on the network). Multicast delivers IP packets to a group of hosts on the network - not
everybody and not just 1.
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. The class D IP
address is used to identify host groups and can be in the range 224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is not assigned to any group and is used by IP multicast computers. The address 224.0.0.1 is used for
query messages and is assigned to the permanent group of all IP hosts (including gateways). All hosts must join
the 224.0.0.1 group in order to participate in IGMP. The address 224.0.0.2 is assigned to the multicast routers
group.
The ZyXEL device supports both IGMP version 1 (IGMP-v1) and IGMP version 2 (IGMP-v2). At start up, the
ZyXEL device queries all directly connected networks to gather group membership. After that, the ZyXEL
device periodically updates this information. IP multicasting can be enabled/disabled on the ZyXEL device LAN
and/or WAN interfaces in the web configurator (LAN; WAN). Select None to disable IP multicasting on these
interfaces.
5.4
Configuring LAN IP – ZyWALL
Select a device and then click Configuration > LAN. IP is the first tab.
5-2
Configuration > LAN
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