ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

525 

Chapter 35 LAN Setup

Use the instructions in the following table to configure TCP/IP parameters for the LAN port.

Note: LAN and DMZ IP addresses must be on separate subnets.

Table 198   Menu 3.2: LAN TCP/IP Setup Fields 

TCP/IP Setup:

IP Address

Enter the IP address of your ZyWALL in dotted decimal notation

IP Subnet Mask

Your ZyWALL 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 ZyWALL.

RIP Direction

Press [SPACE BAR] and then [ENTER] to select the RIP direction. Options are: 

Both, In Only, Out Only or None.

Version

Press [SPACE BAR] and then [ENTER] to select the RIP version. Options are: 

 

RIP-1, RIP-2B or RIP-2M.

Multicast

IGMP (Internet Group Multicast Protocol) is a session-layer protocol used to 

establish membership in a Multicast group. The ZyWALL supports both IGMP 

version 1 (IGMP-v1) and version 2 (IGMP-v2). Press [SPACE BAR] and then 

[ENTER] to enable IP Multicasting or select None (default) to disable it.

Edit IP Alias

The ZyWALL supports three logical LAN interfaces via its single physical Ethernet 

interface with the ZyWALL itself as the gateway for each LAN network. Press 

[SPACE BAR] to select Yes and then press [ENTER] to display menu 3.2.1

When you have completed this menu, press [ENTER] at the prompt [Press ENTER to Confirm…] to 

save your configuration, or press [ESC] at any time to cancel.

First DNS Server
Second DNS 

Server
Third DNS Server

The ZyWALL passes a DNS (Domain Name System) server IP address (in the order 

you specify here) to the DHCP clients. 
Select From ISP if your ISP dynamically assigns DNS server information (and the 

ZyWALL's WAN IP address). The IP Address field below 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 IP Address field below. If you chose User-Defined, but 

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

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

address, the second User-Defined changes to None after you save your changes.
Select DNS Relay to have the ZyWALL act as a DNS proxy. The ZyWALL's LAN IP 

address displays in the IP Address field below (read-only). The ZyWALL tells the 

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

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

query to the ZyWALL's system DNS server (configured in menu 1) 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 

 after you save your changes.

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 machine in order to access it.

DHCP Server 

Address

If Relay is selected in the DHCP field above, then type the IP address of the actual, 

remote DHCP server here.

Table 197   Menu 3.2: DHCP Ethernet Setup Fields