ZyXEL Communications ZyWALL 1000 manual 209

	Chapter 10 Interface
Table 58 Network > Interface > Bridge > Edit (continued)
LABEL	DESCRIPTION
MTU	Maximum Transmission Unit. Type the maximum size of each data packet, in
	bytes, that can move through this interface. If a larger packet arrives, the
	ZyWALL divides it into smaller fragments. Allowed values are 576 - 1500.
	Usually, this value is 1500.
DHCP Settings
DHCP	Select what type of DHCP service the ZyWALL provides to the network.
	Choices are:
	None - the ZyWALL does not provide any DHCP services. There is already a
	DHCP server on the network.
	DHCP Relay - the ZyWALL routes DHCP requests to one or more DHCP
	servers you specify. The DHCP server(s) may be on another network.
	DHCP Server - the ZyWALL assigns IP addresses and provides subnet mask,
	gateway, and DNS server information to the network. The ZyWALL is the DHCP
	server for the network.
	These fields appear if the ZyWALL is a DHCP Relay.
Relay Server 1	Enter the IP address of a DHCP server for the network.
Relay Server 2	This field is optional. Enter the IP address of another DHCP server for the
	network.
	These fields appear if the ZyWALL is a DHCP Server.
IP Pool Start	Enter the IP address from which the ZyWALL begins allocating IP addresses. If
Address	you want to assign a static IP address to a specific computer, click Add Static
	DHCP.
	If this field is blank, the Pool Size must also be blank. In this case, the ZyWALL
	can assign every IP address allowed by the interface’s IP address and subnet
	mask, except for the first address (network address), last address (broadcast
	address) and the interface’s IP address.
Pool Size	Enter the number of IP addresses to allocate. This number must be at least one
	and is limited by the interface’s Subnet Mask. For example, if the Subnet Mask
	is 255.255.255.0 and IP Pool Start Address is 10.10.10.10, the ZyWALL can
	allocate 10.10.10.10 to 10.10.10.254, or 245 IP addresses.
	If this field is blank, the IP Pool Start Address must also be blank. In this case,
	the ZyWALL can assign every IP address allowed by the interface’s IP address
	and subnet mask, except for the first address (network address), last address
	(broadcast address) and the interface’s IP address.
First DNS Server	Specify the IP addresses of a maximum of three DNS servers that the network
Second DNS	can use. You can specify these IP addresses two ways.
Server	Custom Defined - enter a static IP address
Third DNS
	From ISP - use the IP address of a DNS server that another interface received
Server
	from its DHCP server.
First WINS	Type the IP address of the WINS (Windows Internet Naming Service) server
Server, Second	that you want to send to the DHCP clients. The WINS server keeps a mapping
WINS Server	table of the computer names on your network and the IP addresses that they
	are currently using.
Lease time	Specify how long each computer can use the information (especially the IP
	address) before it has to request the information again. Choices are:
	infinite - select this if IP addresses never expire
	days, hours, and minutes - select this to enter how long IP addresses are
	valid.

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ZyWALL USG 1000 User’s Guide