3Com 4210 PWR - Displaying DHCP;BOOTP Client Configuration; DHCP Client Configuration Example

288 CHAPTER 26: DHCP/BOOTP CLIENT CONFIGURATION
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Currently, the Switch 4210 functioning as the DHCP client can use an IP address
for 24 days at most. That is, the DHCP client can obtain an address lease for no
more than 24 days even though the DHCP server offers a longer lease period.
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To improve security and avoid malicious attack to the unused SOCKETs, the Switch
4210 provides the following functions:
■ UDP 67 and UDP 68 ports used by DHCP are enabled only when DHCP is
enabled.
■ UDP 67 and UDP 68 ports are disabled when DHCP is disabled.
The specific implementation is:
■ Using the ip address dhcp-alloc command enables the DHCP client, and UDP
port 68.
■ Using the undo ip address dhcp-alloc command disables the DHCP client, and
UDP port 68.
Displaying
DHCP/BOOTP Client
Configuration
DHCP Client
Configuration
Example
Network requirements Using DHCP, VLAN-interface 1 of Switch B is connected to the LAN to obtain an IP
address from the DHCP server.
Configure the VLAN interface to
obtain IP address through DHCP
or BOOTP
ip address { bootp-alloc
| dhcp-alloc }
Required
By default, no IP address is
configured for the VLAN
interface.
Table 215 Configure a DHCP/BOOTP client
Operation Command Description
Operation Command Description
Display related information on a
DHCP client
display dhcp client [ verbose
]
Optional
Available in any view
Display related information on a
BOOTP client
display bootp client [
interface Vlan-interface
vlan-id ]