ZyXEL P-304 User Guide - Page 39

The WAN Screen, SUA/NAT, RIP Version, RIP-1, RIP-2B, RIP Direction, Multicast

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Prestige 304 Broadband Sharing Gateway with 4-Port Switch 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 Prestige 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. 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 session-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 Prestige supports both IGMP version 1 (IGMP-v1) and IGMP version 2 (IGMP-v2). At start up, the Prestige queries all directly connected networks to gather group membership. After that, the Prestige periodically updates this information. IP Multicasting can be enabled/disabled on the Prestige LAN and/or WAN interfaces in the web configurator (ADVANCED->LAN; ADVANCED->WAN). Select None to disable IP Multicasting on these interfaces. 5.3 The WAN Screen This screen allows you to configure the WAN parameters of your Prestige. Refer to section 4.3. 5.4 SUA/NAT This section discusses SUA (Single User Account)/NAT (Network Address Translation) Server applications of the Prestige. The Advanced Screens 5-3

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Prestige 304 Broadband Sharing Gateway with 4-Port Switch
The Advanced Screens
5-3
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 Prestige 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
.
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 session-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 Prestige supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the
Prestige queries all directly connected networks to gather group membership. After that, the Prestige
periodically updates this information. IP Multicasting can be enabled/disabled on the Prestige LAN and/or
WAN interfaces in the web configurator (
ADVANCED
->
LAN
;
ADVANCED
->
WAN
). Select
None
to
disable IP Multicasting on these interfaces.
5.3
The WAN Screen
This screen allows you to configure the WAN parameters of your Prestige.
Refer to section
4.3.
5.4
SUA/NAT
This section discusses SUA (Single User Account)/NAT (Network Address Translation) Server applications
of the Prestige.