Ip Multicast; Ip Policies; Table 5-1 Default Prestige Ip Assignment - ZyXEL Communications PRESTIGE 1400 User Manual

Prestige 1400 WAN Router with Integrated Ethernet Switch
IP Pool Setup
The Prestige is pre-configured with a pool of 220 IP addresses starting from 192.168.1.1 to 192.168.1.220. For
local application servers, e.g., mail, FTP, telnet, web, etc. that you wish to assign static addresses, then choose from
192.168.1.221 to 192.168.1.253.
Prestige LAN IP address
IP Pool for DHCP clients
Suggested static IP addresses for
local application servers.
DNS Server Address
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and vice versa, e.g.,
the IP address of www.zyxel.com is 204.217.0.2. The DNS server is extremely important because without it, you
must know the IP address of a machine before you can access it.
There are two ways that an ISP disseminates the DNS server addresses. The first is for an ISP to tell a customer the
DNS server addresses, usually in the form of an information sheet, when you sign up. If your ISP does give you the
DNS server addresses, enter them in the DNS Server fields in the DHCP setup menu. The second is to leave
this field blank, i.e., 0.0.0.0 – in this case the Prestige acts as a DNS proxy.
5.1.4

IP Multicast

Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender to 1 recipient) or Broadcast
(1 sender to everybody on the network). IP Multicast is a third way to deliver IP packets to a group of hosts on the
network.
IGMP (Internet Group Management 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 widely used. 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-v2. At start up, the Prestige queries all directly
connected networks to gather group membership. After that, the Prestige periodically updates this information by
sending a membership query to 224.0.0.1. IP Multicasting can be enabled/disabled on the Prestige LAN and/or
WAN interfaces using menus 3.2 (LAN) and 11.3 (WAN). Select None to disable IP Multicasting on these
interfaces.
5.2

IP Policies

Traditionally, routing is based on the destination address only and the router takes the shortest path to forward a
packet. IP Policy Routing (IPPR) provides a mechanism to override the default routing behavior and alter the
packet forwarding based on the policy defined by the network administrator. Policy-based routing is applied to
incoming packets on a per interface basis, prior to the normal routing. Create policies using SMT Menu 25 (see the
IP Policy Routing chapter) and apply them on the Prestige LAN and/or WAN interfaces using menus 3.2 (LAN)
and 11.3 (WAN).
5-2

Table 5-1 Default Prestige IP Assignment

192.168.1.254
192.168.1.1 to 192.168.1.220
192.168.1.221 to 192.168.1.253
Internet Access