I have a weird issue with VLANs on my network, which I share with my tenant. A simple setup to segregate devices between me and my tenant, so that we can’t see each other’s chromecast or such. It works great for the most part but sometimes he would start experiencing slow downs or is unable to access some websites (DNS_PROBE_STARTED error), while everything is fine on my end.

Here’s my setup:

ISP—>modem—>router #1 (TL-R600VPN)—>switch (TL-SG1016PE)—>router #2 (Netgear R8000 in AP mode)

Nothing special in router #1 and #2. #1 Has a default VLAN (123 untagged) and #2 is setup in AP mode. The config is done in the switch: QoS and bandwidth control and VLANs.

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Here is the config on the switch:

Port 16 is the internet connection (from router #1)

Port 15 is the cable going to the appartment (to router #2)

the other ports are for my own network

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Here is the 802.1Q VLAN config on the switch:

Port 1-16: Default VLAN (1), untagged

Port 15-16: VLAN (456) untagged

Port 15 has a PVID 456 (while the other ports are on default PVID, 1)

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As I said it can work fine for some time then I start having issues. Any idea?

Thanks