Couldn't get IP address

Hi efelledi,

The key question is how many users and devices will access this interface over the course of 1 week?

At the moment you have set the “Lease Time” to 604800 seconds (7 days). That means that every device attaching to the interface will have an IP address reserved for the next 7 days.

So in your original config (subnet 255.255.255.0) you had 252 IP addresses available to be leased out.

If device number 253 tries connect to this interface over the course of a week (eg your phone) no addresses will be available to be leased out.

So Alex is right- you can make the subnet bigger if you need to allow for more devices.

Or if you only ever have a few guest devices that come and go each day with new devices the next make the lease time shorter to allow the IP addresses to be reused. 

I would typically use a 4 hour lease time (14400 seconds). That’s enough for devices coming and going and the DHCP protocol doesn’t generate a lot of traffic.

If you don’t have a clear idea how many devices will use this interface I would make the lease time shorter anyway. 7 days is unusually long I think.

Hope that helps you.

Kind Regards,

Andy.