Does a disconnect occur after the DHCP server updates the IP for the device at the end of the lease?

Question

Computer networks

It's about a simple home network. There is a router, smartphones are connected to it. When connected, the router issues random IP to smartphones. Everything works fine, but occasionally the Internet sags for a few seconds. Could there be a reason in the DHCP server and IP change? TPlink 845n router (2019).

Answer 1

Does the Internet lag on a specific device or on all at once? If not all, then always the same? If each time there are different devices, try using the wifi analyzer to see the RSSI at the connection point at the time of the breaks. For 2.4 GHz, the client falls off at RSSI approximately lower than (-80) dBm, for 5 GHz it is even worse, it can fall off at (-60). If the signal is bad, then everything is obvious, poor coverage, the influence of interwave interference, collisions in the air. If the signal is normal at the same time, you should look for the cause programmatically, it may be poorly compatible software on the router and client, or problems with the wifi module on the client / radio processor on the router.
I would exclude Dhcp, everything happens so fast there that the client does not notice.
Also on smartphones there is an authorization function with a randomized MAC address, if this is your home network, set the original MAC address. On Windows, there is a trick in the WLAN adapter settings - "Connect even if the network does not broadcast the SSID".
I also strongly do not recommend manually setting the channel, since the other (neighboring) routers most likely have automatic channel selection, and the fact that you now choose a less loaded channel does not mean at all that the air will not change in a couple of minutes.
PS. I deal with issues like this every day at work.

Answer 2

No, the reason is definitely not related to DHCP.
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The problem is in Tplink itself, these are ugly routers, they usually work unstably.
I always change to some normal thread, for example, I change to microtics and the problems usually go away.

Answer 3

The problem is most likely in the wifi module of the tlink itself. Well, or in his firmware

Answer 4

It is unlikely that the cause is dhcp. I don't remember what exactly was written there in the RFC, but the meaning is something like this
1. The client prolongs the lease time in advance
2. The client releases the IP if it could not renew.
In practice, I have seen jambs when the provider sets the lease time to 10 minutes for its own needs, and the Chinese router, in principle, cannot renew the lease so often.

Answer 5

Above, they wrote correctly about wifi instability, to make sure of this, download wifi analayzer, look on the channels tab for how many wifi channels are clogged, if there is a strong 5Mg range in smartphones, change the router to another one with support for this range, just keep in mind that it is designed for shorter distances and his signal fades faster