Add an option to disable the ping-check in dhcpd
In experiencing some strange DHCP behavior at a customer site, where DHCP leases were getting abandoned and never re-used causing the pool to fill up and run out of available IPs, the solution was to turn off the ping-check in dhcpd.conf.
The problem is that currently in pfSense that conf option is hard-coded and there is no way to override it.
I've created a patch to test it with the site, where it's not working. I'll submit a pull request for your consideration.