Wifi – Can’t ping wireless laptop from internal network

Did you set the gateway on the D-link when you set it as an AP?

Since pings work from local network, but not from other networks, this could be the most obvious problem, and easiest to verify.

After edit:

Did you check the firewall rules on the AP? Some allow pings only from "LAN" networks (not from WAN), or directly attached networks.

With default firmware, it's hard to debug, but if there's *wrt on it, you can try testing with tcpdump if packets come to the AP (they should), and check the firewall rules.

Hmm, sorry to double post too, but I believe the StackOverflow one may be redirected or deleted (as not appropriate for that site).

Here are my questions again (can't put it in a simple comment):

This is weird: the router should be the one with enough dedicated interface to separate all your lans as needed and route between them.

From the picture it's as if your server (3.50) has 2 interfaces, one in 3.x, the other in 2.x. This should mean that between it and the PCs, there is another device (a switch? hub? another router?) so that they can talk together.

Please update the picture to give all the interfaces you use on each device (router, and server, especially) so we can clearly see what you need to do.

from the picture I can guess:

• the router you show is the Wifi router.
• the laptop and the server both connect to it via WiFi.

But I can't guess:

• how does the server and the PCs connect together? via another switch? via the LAN port of the router? The fact you can't route between them seems to indicate they are not on the same lan at all...