Quote: Originally Posted by jimbo45
the owner of a bar I go to regularly asked me if he could sort out a propblem with his router (even though I'm NOT a hardware geek or a network one by any manner at all).
The Cafe owner just about knows how to turn on and use a PC which is how I became involved.
He's (like a lot of places) has been supplying Free wi-fi --which during the Euro 2012 competition has been very popular with loads of visitors. This is a bar incredibly popular with visitors from everywhere especially at weekends etc.
However the IP addresses don't seem to get released -- even when a customer leaves and is out of range.
I've been back on many occasions and when I logon to the wifi get the identical IP address which I had last time -- which is strange while sometimes others can't get on at all.
So what happens from time to time is that some customers cannot logon to the wi-fi until the router is totally re-booted -- obviously in a busy bar this isn't a good idea.
Are there any settings on a typical router to flush and re-allocate IP addresses after a certain period if no activity occurs. From what I can see of the router it IS set for DHCP.
Any help on this would be greatfully acknowleged. ( I suggested that maybe he should get a New router -- but that could be overkill and might not solve the problem anyway).
My default DHCP lease time is set for 1440 minutes, or 24 hours, but it can be changed under Network settings in my routers set up page. They might have this setting turned off or left blank which may cause it to run out of DHCP IP's with no chance to renew them.
The DHCP range for most routers is set to only 100 address so it may be that all the IP's are used up in a 24 hour period. In this case changing the lease time to 2, 4, or 8 hours would allow for more IP's to be released in that time frame making them available again in a shorter amount of time.
Conversely, you also might be able to change the number of assignable IP's to more than 100.
You can see the DHCP lease renewal setting at 1440 in the picture below but it will be different for the router in the bar which I have no idea who makes it.