ZyWALL 5/35/70 Series User’s Guide

 

Table 22 LAN

(continued)

 

 

 

 

 

LABEL

 

DESCRIPTION

 

 

 

 

 

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.

 

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

 

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

 

Address

 

 

 

Pool Size

 

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

 

 

 

 

 

DHCP Server

 

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

 

Address

 

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

 

 

 

button to copy and/or paste the IP address.

 

Windows

 

NetBIOS (Network Basic Input/Output System) are TCP or UDP packets that

 

Networking

 

enable a computer to connect to and communicate with a LAN. For some dial-up

 

(NetBIOS over

 

services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls.

 

TCP/IP)

 

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.

 

Allow between

 

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

 

LAN and WAN

 

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

 

 

 

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

 

 

 

rule that forwards NetBIOS traffic.

 

 

 

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

 

 

 

and from the WAN to the LAN.

 

Allow between

 

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

 

LAN and DMZ

 

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

 

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

 

LAN and WLAN

 

from the WLAN to the LAN.

 

 

 

Clear this check box to block all NetBIOS packets going from the LAN to the WLAN

 

 

 

and from the WLAN to the LAN.

 

Apply

 

Click Apply to save your changes back to the ZyWALL.

 

 

 

 

 

Reset

 

Click Reset to begin configuring this screen afresh.

 

 

 

 

Chapter 5 LAN Screens

110