Hello all,
I'm curiious if this worked for @nertskul but for me this did the trick.
I found this thread because I had a very similar problem.
I seperated my home network in 3 vlans: LAN(untaged) IOT(tagged) and Guest(tagged)
The vlans are connecting 2 APs, both netgear R7800s.
On each AP, there are 3 wifi networks, connected to the vlans.
I had terrible latency when pinging from the LAN network to a device in the IOT network.
ping times ranged from 2 to 5 seconds. With wireshark I saw occational retransmissions.
I had already figured out that when I connected the IOT wifi to the LAN interface, the problem was gone.
Now I have set the MTU size to 1496 on the vlan (bridge) interfaces , and the latency and responsiveness is OK again.
Thanks!
Bert Haverkamp