Ip Address And Subnet Mask; Rip Setup - ZyXEL Communications ZyWALL 5 User Manual

ZyWALL 5 Internet Security Appliance
IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits)
DHCP server enabled with 128 client IP addresses starting from 192.168.1.33.
These parameters should work for the majority of installations. If your ISP gives you explicit DNS
server address(es), read the embedded web configurator help regarding what fields need to be
configured.

4.3.2 IP Address and Subnet Mask

Refer to the IP Address and Subnet Mask section in the Wizard Setup chapter for this information.

4.3.3 RIP Setup

RIP (Routing Information Protocol, RFC 1058 and RFC 1389) allows a router to exchange routing
information with other routers. RIP Direction controls the sending and receiving of RIP packets.
When set to Both or Out Only, the ZyWALL 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 ZyWALL
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.
4.3.4 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 ZyWALL supports both IGMP version 1 (IGMP-v1) and IGMP version 2 (IGMP-v2). At start
up, the ZyWALL queries all directly connected networks to gather group membership. After that, the
ZyWALL periodically updates this information. IP multicasting can be enabled/disabled on the
ZyWALL LAN and/or WAN interfaces in the web configurator (LAN; WAN). Select None to disable
IP multicasting on these interfaces.
4-2 LAN Screen