ZyXEL Communications P-334 User Manual

Prestige 334 User’s Guide

Chapter 5 LAN Screens

68

First DNS Server
Second DNS Server
Third DNS Server 

Select From ISP if your ISP dynamically assigns DNS server information (and 

the Prestige's WAN IP address). The field to the right displays the (read-only) 

DNS server IP address that the ISP assigns. 
Select User-Defined if you have the IP address of a DNS server. Enter the DNS 

server's IP address in the field to the right. If you chose User-Defined, but leave 

the IP address set to 0.0.0.0, User-Defined changes to None after you click 

Apply. If you set a second choice to User-Defined, and enter the same IP 

address, the second User-Defined changes to None after you click Apply. 
Select DNS Relay to have the Prestige act as a DNS proxy. The Prestige's LAN 

IP address displays in the field to the right (read-only). The Prestige tells the 

DHCP clients on the LAN that the Prestige itself is the DNS server. When a 

computer on the LAN sends a DNS query to the Prestige, the Prestige forwards 

the query to the Prestige's system DNS server (configured in the SYSTEM 

General screen) and relays the response back to the computer. You can only 

select DNS Relay for one of the three servers; if you select DNS Relay for a 

second or third DNS server, that choice changes to None after you click Apply. 
Select None if you do not want to configure DNS servers. If you do not configure 

a DNS server, you must know the IP address of a computer in order to access it.

LAN TCP/IP

IP Address

Type the IP address of your Prestige in dotted decimal notation 192.168.1.1 

(factory default).

IP Subnet Mask

The subnet mask specifies the network number portion of an IP address. Your 

Prestige will automatically calculate the subnet mask based on the IP address 

that you assign. Unless you are implementing subnetting, use the subnet mask 

computed by the Prestige 255.255.255.0.

RIP Direction

RIP (Routing Information Protocol, RFC1058 and RFC 1389) allows a router to 

exchange routing information with other routers. The RIP Direction field controls 

the sending and receiving of RIP packets. Select the RIP direction from Both/In 

Only/Out Only/None. When set to Both or Out Only, the Prestige 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. Both is the default.

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). 

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. By default, RIP direction is set to Both and 

the Version set to RIP-1.

Multicast

Select IGMP V-1 or IGMP V-2 or None. 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.

Windows Networking (NetBIOS over TCP/IP): NetBIOS (Network Basic Input/Output System) are TCP 

or UDP broadcast packets that enable a computer to connect to and communicate with a LAN. For 

some dial-up services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls. However it 

may sometimes be necessary to allow NetBIOS packets to pass through to the WAN in order to find a 

computer on the WAN.

Table 12   LAN IP