DHCP stops working when ip address and subnet are changed

[akieni]

Hello
I have done a pfsense fresh install.. everything works on the LAN port with the ip 192.168.1.1 and subnet 255.255.255.0.
Once I change the ip address class to 10.0.0.1/8 everything works as well.
But the DHCP stops working once I go to SERVICE-DHCP SERVER and change the range of the starting ip to 10.0.0.2 -  10.255.255.253.

The DCHP stops working and no computer on the LAN port can't automatically obtained an ip address…
I am doing something wrong here with setting up the cidr ?

Chris

[cmb]

dhcpd allocates a certain amount of memory for each available lease. Having a pool that huge is completely unnecessary, and would require gobs of RAM for dhcpd alone. Make the pool a reasonable size and you'll be fine. Probably better off with a /24 or /20 if you have a big network, using an entire /8 on a single broadcast domain isn't a good practice.

[akieni]

True, it was a memory limitation…. I did not know that the ip allocation would use that much resources from my server...
Thanks

[heper]

only when you reserve leases for >16million devices

[Harvy66]

@akieni:

True, it was a memory limitation…. I did not know that the ip allocation would use that much resources from my server...
Thanks

16mil IPs times ( 4 bytes per IP plus 12 bytes per MAC address) is 256MiB. That is not including any other overhead like padding, time stamps, etc.