What could be the problem with the DIR 320NRU router?

Question

network hardware

In general, I installed a wi-fi router DIR 320NRU in the office, password protected, the Internet works.
The next day, everyone's network fell, they say, like because of me.
What did I write wrong and in which tab should I write?
What to watch?
I'm browsing the network environment with a directly connected LAN and I see
DCS-931L (192.168.100.73:80) 192.168.100.73
DIR-320 192.168.100.184
D-Link DI Series 192.168.100.1
If you can explain at the same time what these devices are, I will be grateful.

Answer 1

1 - IP camera
2 - access point
3 - most likely an access point.
Because many can sit on different access points and they all have a DHCP server, you need to configure 1 common network, leaving only 1 DHCP server. The rest to set up. so that requests go towards 1 router.
It can be done by setting a static route. You can make 1 network with general addressing (since everyone is on the same subnet 192.168.100.x).
In general, before doing this, you need to read the principles of building a LAN :) write to Skype - sasha.skot.