SonicWALL TZ 190 Manuale Utente

Chapter 19: 

Address Objects are one of four object classes (Address, User, Service, and Schedule) in 
SonicOS Enhanced. These Address Objects allow for entities to be defined one time, and to be 
re-used in multiple referential instances throughout the SonicOS interface. For example, take 
an internal Web-Server with an IP address of 67.115.118.80. Rather than repeatedly typing in 
the IP address when constructing Access Rules or NAT Policies, Address Objects allow you to 
create a single entity called “My Web Server” as a Host Address Object with an IP address of 
67.115.118.80. This Address Object, “My Web Server” can then be easily and efficiently 
selected from a drop-down menu in any configuration screen that employs Address Objects as 
a defining criterion. 

Since there are multiple types of network address expressions, there are currently the following 
Address Objects types:

Host – Host Address Objects define a single host by its IP address. The netmask for a Host 
Address Object will automatically be set to 32 bit (255.255.255.255) to identify it as a single 
host. For example, “My Web Server” with an IP address of “67.115.118.110” and a default 
netmask of “255.255.255.255” 

Range – Range Address Objects define a range of contiguous IP addresses. No netmask 
is associated with Range Address Objects, but internal logic generally treats each member 
of the specified range as a 32 bit-masked Host object. For example “My Public Servers” 
with an IP address starting value of “67.115.118.66” and an ending value of 
“67.115.118.90”. All 25 individual host addresses in this range would be comprised by this 
Range Address Object. 

Network – Network Address Objects are like Range objects in that they comprise multiple 
hosts, but rather than being bound by specified upper and lower range delimiters, the 
boundaries are defined by a valid netmask. Network Address Objects must be defined by 
the network’s address and a corresponding netmask. For example “My Public Network” with 
a Network Value of “67.115.118.64” and a Netmask of “255.255.255.224” would comprise 
addresses from 67.115.118.64 through to 67.115.118.95. As a general rule, the first 
address in a network (the network address) and the last address in a network (the 
broadcast address) are unusable.