ZyAIR G-2000 Plus User’s Guide

 

Table 17 LAN IP

 

 

 

 

 

LABEL

DESCRIPTION

 

 

 

 

First DNS Server

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

 

Second DNS Server

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

 

Third DNS Server

server IP address that the ISP assigns.

 

Select User-Definedif 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-Definedchanges to None after you click

 

 

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

 

 

address, the second User-Definedchanges to None after you click Apply.

 

 

Select DNS Relay to have the ZyAIR act as a DNS proxy. The ZyAIR's LAN IP

 

 

address displays in the field to the right (read-only). The ZyAIR tells the DHCP

 

 

clients on the LAN that the ZyAIR itself is the DNS server. When a computer on

 

 

the LAN sends a DNS query to the ZyAIR, the ZyAIR forwards the query to the

 

 

ZyAIR'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 ZyAIR 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

 

 

ZyAIR 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 ZyAIR 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 ZyAIR 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 ZyAIR sends (it recognizes both formats when receiving).

 

 

RIP-1is 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-2Band RIP-2Msends the routing data in RIP-2 format; the

 

 

difference being that RIP-2Buses subnet broadcasting while RIP-2Muses

 

 

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-1or IGMP V-2or 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.

Chapter 5 LAN Screens

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