Why does the IP camera not want to connect to a certain static address?

Question

Computer networks

Good time)

I purchased 6 IP cameras with one order. I connected them all at once, assuming that they will have dynamic addresses by default. But each camera turned out to have the same static address. With grief, I activated 5 cameras in half (you activate one under the network brakes, the next one appears in the scanner, etc.), the sixth turned off (or, I thought, maybe it was defective). In the scanner, it is detected, pinged (1 ms, but with a packet skip every 10-60 seconds), but the web interface loads very slowly and in chunks, often not loading the page completely. Somehow he activated it and the adventures suddenly continued.

When you connect it to the local network, all cameras and remote access to the computer (a computer in the local network, connecting to it from another computer via the Internet) start to slow down fiercely. I disconnect it from the network - all devices work normally. The viewer program does not see it (although it is detected in the scanner). The web interface stopped responding to the input at all.

I reflashed it to a fresh firmware, fortunately it was possible without any problems (apart from the fact that the instructions on the manufacturer's website say that the computer should be with the address 192.0. It did not help.

Installed SADP, and changed its address to 192.168.1.70 instead of the default .64. All other cameras work with the same addresses - 192.168.1.XX - and there are no problems with them. SADP sees the new .70 address, the scanner and the viewer program do not.

Enabled DHCP via SADP. The camera assigned itself the address 169.XXX.XXX.XX, the web interface started working, the stream went to the program for viewing. But I want the cameras to have ordered addresses - 192.168.1.XX. I flashed it through the web interface. Nothing changed. Reset to factory settings through the same interface. Nothing. If you assign it a static address from 169.XXX.XXX.XXX - it works without problems. If the address is like that of other cameras (not the same, from the same subnet or whatever it is called) - no.

A question for those who have mastered this long post (my respect for you).Why is this happening? Some kind of magic or something. 5 exactly the same cameras work on 192.168.1 and everything is ok. The sixth camera does not want to work with these addresses. At first I thought about handing it over under warranty (I thought only a dynamic address would work, and this is hemorrhoids, cameras are viewed through nat, there are power outages), when I saw that it was working with at least some static address, I already reconciled. But it's still interesting to understand why this happens.

Answer 1

Addresses 169.254.XX are special, and in fact, are set when the device cannot be configured via DHCP. So the question is - what do you have with DHCP?

Answer 2

And also check the mac addresses, arp -a, maybe these cameras have the same ones :)