3com 5500-ei pwr Guía De Referencia

 

1-9 

Use the dhcp server detect command to enable the unauthorized DHCP server detection function. 

With this feature enabled, upon receiving a DHCP request, the DHCP server will record the IP 

addresses of any DHCP servers which ever assigned an IP address to the DHCP client and the 

receiving interface. The administrator can use this information to check out any unauthorized DHCP 

servers. 

Use the undo dhcp server detect command to disable the unauthorized DHCP server detecting 

function. 

By default, the unauthorized DHCP server detecting function is disabled.  

Note that: 

With unauthorized DHCP server detection enabled, the device records only one entry for each DHCP 

server. The administrator needs to find unauthorized DHCP servers from the log information. 

# Enter system view. 

<Sysname> system-view 

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

# Enable the unauthorized DHCP server detecting function. 

[Sysname] dhcp server detect 

In VLAN interface view, use the following commands to specify the DNS server IP address in the 

current DHCP interface address pool for the client. 

dhcp server dns-list ip-address&<1-8> 

undo dhcp server dns-list { ip-address | all } 

In system view, use the following commands to specify the DNS server IP address in multiple DHCP 

interface address pools for the client. 

dhcp server dns-list ip-address&<1-8> { interface interface-type interface-number [ to interface-type 

interface-number ] | all } 

undo dhcp server dns-list  { ip-address | all } { interface  interface-type interface-number [ to 

interface-type interface-number ] | all } 

System view, VLAN interface view 

ip-address&<1-8>: IP address of a DNS server. &<1-8> means you can provide up to eight DNS server 

IP addresses. When inputting more than one DNS server IP address, separate two neighboring IP 

addresses with a space. 

interface  interface-type interface-number [ to  interface-type interface-number ]: Specifies the 

interface(s), through which you can specify the corresponding interface address pools. The 

interface-type  argument specifies an interface type; the interface-number argument specifies an