3com 5500-ei pwr Guía De Referencia

 

5-3 

 

To improve security and avoid malicious attacks to the unused sockets, S5500-EI Ethernet switches 

provide the following functions: 

z 

UDP ports 67 and 68 used by DHCP are enabled/disabled only when DHCP is enabled/disabled.  

The implementation is as follows: 

z 

After the DHCP client is enabled by executing the ip address dhcp-alloc command, UDP port 68 

is enabled.  

z 

After the DHCP client is disabled by executing the undo ip address dhcp-alloc command, UDP 

port 68 is disabled. 

 

# Configure VLAN-interface 1 to obtain an IP address through DHCP. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

[Sysname] interface Vlan-interface 1 

[Sysname-Vlan-interface1] ip address dhcp-alloc 

display bootp client [ interface Vlan-interface vlan-id ] 

Any view 

vlan-id: ID of the VLAN interface. 

Use the display bootp client command to display BOOTP client-related information, including the 

MAC address of the BOOTP client and the IP address obtained. 

# Display the BOOTP client-related information. 

<Sysname> display bootp client interface Vlan-interface 1 

Vlan-interface1: 

Allocated IP: 192.168.0.2 255.255.255.0 

Transaction ID = 0x3d8a7431 

Mac Address  000f-e20a-c3ef 

Default router: 192.168.0.1