User's Manual

Networking
Configuring the VLAN
Cisco ISA500 Series Integrated Security Appliance Administrator Guide 122
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• IPv6 Prefix Length: Enter the number of characters in the IPv6 prefix.
The IPv6 network (subnet) is identified by the prefix, which consists of the
initial bits of the address. The default prefix length is 64 bits. All hosts in the
network have the identical initial bits for the IPv6 address. The number of
common initial bits in the addresses is set by the prefix length field.
STEP 7 Click OK to save your settings.
STEP 8 Click Save to apply your settings.
Configuring DHCP Reserved IPs
Even when the security appliance is configured to act as a DHCP server, you can
reserve certain IP addresses to always be assigned to specified devices.
Use the Static IP Reservations page to bind the MAC address of the device with
the desired IP address. Whenever the DHCP server receives a request from a
device, the hardware address is compared with the database. If the device is
found, then the reserved IP address is used. Otherwise, an IP address is assigned
automatically from the DHCP pool.
STEP 1 Click Networking -> Static IP Reservations.
The Static IP Reservations window opens.
STEP 2 To add a new reserved IP, click Add.
Other Options: To edit an entry, click Edit. To delete an entry, click Delete.
After you click Add or Edit, the Static IP Reservations - Add/Edit window opens.
STEP 3 Enter the following information:
• Name: Enter the name for the static IP reservation rule.
• MAC Address: Enter the MAC address of the host under a VLAN.
• IP Address: Enter the IP address within the VLAN’s DHCP pool that is
assigned to the host.
STEP 4 Click OK to save your settings.
STEP 5 Click Save to apply your settings.