User's Manual

Chapter 12 Interfaces
ISG50 User’s Guide
273
Interface
Parameters
Egress
Bandwidth
Enter the maximum amount of traffic, in kilobits per second, the ISG50 can send
through the interface to the network. Allowed values are 0 - 1048576.
Ingress
Bandwidth
This is reserved for future use.
Enter the maximum amount of traffic, in kilobits per second, the ISG50 can receive
from the network through the interface. Allowed values are 0 - 1048576.
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 ISG50 divides it into
smaller fragments. Allowed values are 576 - 1500. Usually, this value is 1500.
DHCP Setting
DHCP Select what type of DHCP service the ISG50 provides to the network. Choices are:
None - the ISG50 does not provide any DHCP services. There is already a DHCP server
on the network.
DHCP Relay - the ISG50 routes DHCP requests to one or more DHCP servers you
specify. The DHCP server(s) may be on another network.
DHCP Server - the ISG50 assigns IP addresses and provides subnet mask, gateway,
and DNS server information to the network. The ISG50 is the DHCP server for the
network.
The following fields appear if the ISG50 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.
The following fields appear if the ISG50 is a DHCP Server.
IP Pool Start
Address
Enter the IP address from which the ISG50 begins allocating IP addresses. If 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 ISG50 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 ISG50 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
ISG50 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
Second DNS
Server
Third DNS
Server
Specify the IP addresses up to three DNS servers for the DHCP clients to use. Use one
of the following ways to specify these IP addresses.
Custom Defined - enter a static IP address.
From ISP - select the DNS server that another interface received from its DHCP server.
ISG50 - the DHCP clients use the IP address of this interface and the ISG50 works as a
DNS relay.
First WINS
Server, Second
WINS Server
Type the IP address of the WINS (Windows Internet Naming Service) server that you
want to send to the DHCP clients. The WINS server keeps a mapping table of the
computer names on your network and the IP addresses that they are currently using.
Table 78 Configuration > Network > Interface > Bridge > Edit (continued)
LABEL DESCRIPTION