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Chapter 12 Interfaces
ISG50 User’s Guide
266
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.
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.
Enable IP/MAC
Binding
Select this option to have the ISG50 enforce links between specific IP addresses and
specific MAC addresses for this VLAN. This stops anyone else from manually using a
bound IP address on another device connected to this interface. Use this to make use
only the intended users get to use specific IP addresses.
Enable Logs for
IP/MAC Binding
Violation
Select this option to have the ISG50 generate a log if a device connected to this VLAN
attempts to use an IP address that is bound to another device’s MAC address.
Static DHCP
Table
Configure a list of static IP addresses the ISG50 assigns to computers connected to the
interface. Otherwise, the ISG50 assigns an IP address dynamically using the interface’s
IP Pool Start Address and Pool Size.
Add Click this to create a new entry.
Edit Select an entry and click this to be able to modify it.
Remove Select an entry and click this to delete it.
# This field is a sequential value, and it is not associated with a specific entry.
IP Address Enter the IP address to assign to a device with this entry’s MAC address.
MAC Enter the MAC address to which to assign this entry’s IP address.
Description Enter a description to help identify this static DHCP entry. You can use alphanumeric
and ()+/:=?!*#@$_%- characters, and it can be up to 60 characters long.
RIP Setting See Section 15.2 on page 302 for more information about RIP.
Enable RIP Select this to enable RIP on this interface.
Direction This field is effective when RIP is enabled. Select the RIP direction from the drop-down
list box.
BiDir - This interface sends and receives routing information.
In-Only - This interface receives routing information.
Out-Only - This interface sends routing information.
Table 73 Configuration > Network > Interface > VLAN > Edit (continued)
LABEL DESCRIPTION