I am wondering if anyone has a solution for this issue.

I am using a TP-LINK Archer C3200 WiFi router as an Access Point, like this:

Internet-------wan:mainrouter:lan-------lan:Archer_C3200 ))))) ((((( client devices

The wireless side of things works just fine.

However, whereas all the previous TP-LINK routers I ever owned also routed traffic between devices plugged into the LAN ports on the router, the C3200 does not. If I plug in my laptop into a LAN port on the C3200 (with a static IP for simplicity), I cannot ping anything on the network. Plugging in the same laptop to any of the other routers or switches on the network works just fine, so I know that it is the C3200 that is for some reason deciding not to route anything between its own LAN ports. Why is that?

My older TP-LINK router that I am replacing was hooked up in exactly the same way and did not have this problem.

Does anyone know how to fix the C3200 so it starts routing LAN traffic? Is there a setting that I am missing?

  • 1
    fwiw, the 'routing' within same subnet usually doesn't involve IP-level routing, just Ethernet-level forwarding by an internal switch chip, so the problem is unlikely to be within e.g. the IP routing table – I'd check first whether the individual ports have some "client isolation" or "port isolation" or "private vlan" feature enabled. (Or if they're assigned to different vlans entirely.) – grawity Oct 15 '18 at 4:09

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