ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 8 DMZ Screens

160

RIP Version

The RIP Version field 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 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.

DHCP Setup

DHCP 

DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows 

individual clients (workstations) to obtain TCP/IP configuration at startup from a 

server. Unless you are instructed by your ISP, leave this field set to Server. When 

configured as a server, the ZyWALL provides TCP/IP configuration for the clients. 

When set as a server, fill in the IP Pool Starting Address and Pool Size fields.

Select Relay to have the ZyWALL forward DHCP requests to another DHCP 

server. When set to Relay, fill in the DHCP Server Address field.

Select None to stop the ZyWALL from acting as a DHCP server. When you select 

None, you must have another DHCP server on your LAN, or else the computers 

must be manually configured. 

IP Pool Starting 

Address

This field specifies the first of the contiguous addresses in the IP address pool.

Pool Size

This field specifies the size, or count of the IP address pool.

DHCP Server 

Address

Type the IP address of the DHCP server to which you want the ZyWALL to relay 

DHCP requests. Use dotted decimal notation. Alternatively, click the right mouse 

button to copy and/or paste the IP address.

Windows 

Networking 

(NetBIOS over 

TCP/IP)

Allow between DMZ 

and LAN

Select this check box to forward NetBIOS packets from the LAN to the DMZ and 

from the DMZ to the LAN. If your firewall is enabled with the default policy set to 

block DMZ to LAN traffic, you also need to enable the default DMZ to LAN firewall 

rule that forwards NetBIOS traffic.
Clear this check box to block all NetBIOS packets going from the LAN to the DMZ 

and from the DMZ to the LAN.

Allow between DMZ 

and WAN

Select this check box to forward NetBIOS packets from the WAN to the DMZ and 

from the DMZ to the WAN. 
Clear this check box to block all NetBIOS packets going from the WAN to the 

DMZ and from the DMZ to the WAN.

Table 45   DMZ (continued)