I now see at the Device Table page IPs of 16, 19, 21-what happened to lower numbers? Does "server lease time" reset IPs? No, I'm not experimenting!
Sorry for the long post in advance, and please let me know if I bore you or am being pedantic...but I thought some folks might be interested in how my logic works for how I set things up.
Sometimes IP's can get held up if the modem doesn't release them...so when changes are made and devices try to connect they may get assigned a new IP, because the old ones haven't been released yet for use...even if it's the same device connecting.
That's the nature of dynamic IPs.
My usual setup is that my modem/router is of course something like 192.168.0.1.
So then I set the range to start assigning the IPs from 192.168.0.100 and higher.
Then I set almost of my usual household equipment that can have static IP's set to things like 192.168.0.2 - 192.168.0.10 or 192.168.0.20 (depending on how many devices have the ability to configure a static IP).
That prevents issues with dropped IP's or conflicts. My Xbox always gets set as 192.168.0.99 (right below the dynamic address range) and I set it as the DMZ device since it's pretty save to have an Xbox exposed luckily.
Then my phones (pretty much the only devices I have currently that don't allow static IP's to be set) pick up dynamic addresses above that 192.168.0.100 mark.
It keeps things remarkably easy and clean. I almost never have conflicts or dropped connection issues this way...even when friends come over and hook up to it...all my stuff sites in a range they can't be assigned to.
The phones also access the 5GHz range (since I'm using a router that is hooked up to the modem via transparent bridging) so that means I don't really get any interference from neighbors either...which is nice.
So all of my stuff is neatly compartmentalized, and designed to work with minimal issues in a complex where I have somewhere around 30 other networks in range that can interfere.