How to create an exclusion from a DHCP lease

03/26/2020 87 20800

DESCRIPTION:

How to create an exclusion from a DHCP lease

RESOLUTION:

You cannot add an exclusion to a DHCP lease scope per se.
The workaround is to split the lease scope into a group of lease scopes, that would exclude the lease you want to make sure are not going to be assigned. 
I attached a self explanatory screen shot of a lease scope split into 3 leases for a dynamic range on one interface X0 of my firewall.



 

Resolution for SonicOS 6.5

This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

You cannot add an exclusion to a DHCP lease scope per se.
The workaround is to split the lease scope into a group of lease scopes, that would exclude the lease you want to make sure are not going to be assigned. 
To do so follow these steps

1. Login to the SonicWALL Management page.
2. Click Manage in the top navigation menu.
3. Navigate to System Setup | Network | DHCP Server
4. Choose the scope, for this KB we have choosen the X0 Subnet and exclude the IP address 192.168.1.100 from the scope and create an additional scope in the same X0 subnet (192.168.1.0/24)
   
   
5. Edit the Scope too and end IP address as shown in the screenshot and click on OK
   
   
6. Create an additional scope for the remaining IP addresses , the scope would look like the screenshot below.