User Manual UMN:CLI
V5808
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For more information of the file naming of a DHCP lease database, see Section 8.5.3.1.
8.5.1.11 Recognition of DHCP Client
Normally, a DHCP server is supposed to prohibit assigning an IP address when DHCP
packets have no client ID (CID). However, some Linux clients may send DHCP discover
messages without CID. To solve such a problem, the switch provides the additional option
to verify a hardware address (MAC address) instead of CID.
To select a recognition method of DHCP clients, use the following command.
ip dhcp database-key {client-id |
hardware-address}
Selects a recognition method of DHCP clients
8.5.1.12 IP Address Validation
Before assigning an IP address to a DHCP client, a DHCP server will validate if the IP
address is used by another DHCP client with a ping or ARP. If the IP address does not
respond to a requested ping or ARP, the DHCP server will realize that the IP address is
not used then will assign the IP address to the DHCP client.
To select an IP address validation method, use the following command.
ip dhcp validate {arp | ping}
Selects an IP address validation method.
You can also set a validation value of how many responses and how long waiting
(timeout) for the responses from an IP address for a requested ping or ARP when a
DHCP server validates an IP address.
To set a validation value of how many responses from an IP address for a requested ping
or ARP, use the following command.
ip dhcp {arp | ping} packet <0-
20>
Sets a validation value of how many responses.
0-20: response value (default: 2)
To set a validation value of timeout for the responses from an IP address for a requested
ping or ARP, use the following command.
ip dhcp {arp | ping} timeout
<100-5000>
Sets a validation value of timeout for the responses in
the unit of millisecond.
100-5000: timeout value (default: 500)
8.5.1.13 Authorized ARP
The authorized ARP is to limit the lease of IP addresses to authorized users. This feature
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