Configuring Static Dhcp - ZyXEL Communications ZyWall 35 User Manual

Table 22 LAN (continued)
LABEL
Multicast
DHCP Setup
DHCP Server
IP Pool Starting
Address
Pool Size
Windows
Networking
(NetBIOS over
TCP/IP)
Allow between
LAN and WAN
Allow between
LAN and DMZ
Apply
Reset

4.5 Configuring Static DHCP

This table allows you to assign IP addresses on the LAN to specific individual computers
based on their MAC Addresses.
Every Ethernet device has a unique MAC (Media Access Control) address. The MAC address
is assigned at the factory and consists of six pairs of hexadecimal characters, for example,
00:A0:C5:00:00:02.
Chapter 4 LAN Screens
DESCRIPTION
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 (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 the DHCP Server check box
selected. Clear it to stop the ZyWALL from acting as a DHCP server. When
configured as a server, the ZyWALL provides TCP/IP configuration for the clients. If
not, DHCP service is disabled and you must have another DHCP server on your
LAN, or else the computers must be manually configured. When set as a server, fill
in the rest of the DHCP setup fields.
This field specifies the first of the contiguous addresses in the IP address pool.
This field specifies the size, or count of the IP address pool.
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.
Select this check box to forward NetBIOS packets from the LAN to the WAN and
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.
Select this check box to forward NetBIOS packets from the LAN to the DMZ and
from the DMZ to the LAN. (Not all ZyWALL models have a DMZ port.) 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.
Click Apply to save your changes back to the ZyWALL.
Click Reset to begin configuring this screen afresh.
ZyWALL 35 User's Guide
101