DHCP does not work correctly, client machines receive IP 169.xxx?

Question

Computer networks

The Internet is connected to the rural school via the HG531 V1 adsl modem, through the lan port the network goes to tp-sg3424 from it to access point engenius eap9550 modems. I'm not very good at networking. Client computers set static ai pi works network and internet. And with dynamic does not get the correct IP address. All eap9550 access points are connected via vlan (I calculated this on the Internet )

Answer 1

Because your DHCP does not distribute addresses, delve into the settings. And if you don’t understand networks, then invite a specialist to set everything up for you.

Answer 2

Your DHCP server is down. The 169.x addresses are zeroconf (apipa) addresses.

Answer 3

Firstly: forget about vlan, as @Ruslan-Strannik already said
Secondly: In order for someone on the network to GET dynamic IP addresses, someone on the network must DISTRIBUTE them.
Thirdly: If, according to statics, the Internet works everywhere, just set up a DHCP server on the first piece of hardware (it can, and moreover, with a quicksetup)
If it doesn’t work out: Call an IT specialist, at least for the first installation, so that it works (although he can break this business with a specialist from time to time, so you have to take a body for full outsourcing.But it's better this way than nothing)