Cisco Small Business RV320, Руководство администратора

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DHCP
Option 82
Cisco RV320/RV325 Administration Guide 49
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The Client Table shows the DHCP client information:
• Client Host Name— Name assigned to a client host.
• IP Address— Dynamic IP address assigned to a client.
• MAC Address (IPv4 only)— MAC address of a client.
• Client Lease Time— Amount of time that a network user can remain
connected to the router with a dynamic IP address.
To release an IPv4 client IP address, select the Client Host Name and click Delete .
Click Refresh to renew the data.
Option 82
Option 82 (DHCP relay agent information option) enables a DHCP relay agent to
include information about itself when forwarding client-originated DHCP packets
to a DHCP server. The DHCP server can use this information to implement IP
addressing or other parameter-assignment policies.
The DHCP Option 82 Configurable Circuit ID enhances validation security by
allowing you to determine what information is provided in the Option 82 Circuit ID
description.
To add a Circuit ID , click Add . A new row is added to the table and the circuit IDs
are listed in the Circuit ID drop-down menu in the DHCP Setup window.
To edit a Circuit ID , select the row and click Edit . The row is opened for
modification.
IP and MAC Binding
When the device is configured as a DHCP server or for DHCP relay, you can bind
static IP addresses to up to 100 network devices, such as a web server or an FTP
server. Binding does not assign an IP address to a device. You should ensure that
each device bound to a static IP address in the IP & MAC binding table is
configured to use a static IP address.
Typically the MAC address of a device physically appears on a label on the
bottom panel or back panel of a device.