SonicWALL TZ 190 Manuale Utente

clients on the network, it provides vendor-specific configuration and service information. The 

 provides a list of DHCP options by RFC-assigned option 

number.

The SonicWALL DHCP server options feature provides a simple interface for selecting DHCP 
options by number or name, making the DHCP configuration process quick, easy, and 
compliant with RFC-defined DHCP standards.

The SonicWALL DHCP server options feature allows definition of DHCP options using a drop-
down menu based on RFC-defined option numbers, allowing administrators to easily create 
DHCP objects and object groups, and configure DHCP generic options for dynamic and static 
DHCP lease scopes. Once defined, the DHCP option is included in the options field of the 
DHCP message, which is then passed to DHCP clients on the network, describing the network 
configuration and service(s) available.

The SonicWALL DHCP server options feature supports the following standards:

RFC 2131 - Dynamic Host Configuration Protocol

RFC 2132 - DHCP Options and BOOTP Vendor Extensions

DHCP server persistence is the ability of the firewall save DHCP lease information and to 
provide the client with a predictable IP address that does not conflict with another use on the 
network, even after a client reboot.

DHCP server persistence provides a seamless experience when a user reboots a workstation. 
The DHCP lease information is saved, and the user retains the same workstation IP address. 
When a firewall is restarted, usually due to maintenance or an upgrade, DHCP server 
persistence provides the following benefits:

IP address uniqueness: Lease information is stored in flash memory, so the risk of 
assigning the same IP address to multiple users is nullified.

Ease of use: By saving the lease information in the flash memory, the user’s connections 
are automatically restored.