Ip Address Validation; Authorized Arp - Siemens S223 User Manual

UMN:CLI
8.8.1.12
8.8.1.13
244
To select a recognition method of DHCP clients, use the following command.
Command
ip dhcp database-key { client-id |
hardware-address }

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 re-
spond 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.
Command
ip dhcp validate { arp | ping }
You can also set a validation value of how many responses and how long waiting (time-
out) 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.
Command
ip dhcp { arp | ping } packet <0-
20>
To set a validation value of timeout for the responses from an IP address for a requested
ping or ARP, use the following command.
Command
ip dhcp { arp | ping } timeout
<100-5000>

Authorized ARP

The authorized ARP is to limit the leasing of IP addresses to authorized users. This func-
tion strengthens security by blocking ARP responses from unauthorized users at the
DHCP server.
To disacrd an ARP response from unauthorized user, use the following command.
Command
ip dhcp authorized-arp <120-
2147483637>
no ip dhcp authorized-arp
SURPASS hiD 6615 S223/S323 R1.5
Mode
Global Selects a recognition method of DHCP clients
Mode
Global Selects an IP address validation method.
Mode
Sets a validation value of how many responses.
Global
0-20: response value (default: 2)
Mode
Sets a validation value of timeout for the responses in
Global the unit of millisecond.
100-5000: timeout value (default: 500)
Mode
Discards an ARP response from unauthorized user.
120-2147483637: starting time (multiples of 30)
Global
Disables the authorized ARP function.
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A50010-Y3-C150-2-7619