I have a TP-Link 740N v3 router with WAN port and LAN port 1 burned.
I was able to flash DD-WRT and to apparently configure WAN port to LAN
port 4 (or 1, I don't actually know how are they numbered by kernel).
Laptop on Wi-fi receives a correct address, from 192.168.1.* network.
But PC, on a wire, receives an IP address from 37.* (for example) network. After that, routing from Internet to Wi-fi 192.168.1.* network stops.
When PC is off, Internet appears on 192.168.1.* again. Apparently, PC grabs an external IP and "all the Internel" from WAN.
Is there anything except vlan1ports/vlan0ports I should configure?
Some diagnostics, ipconfig and so: https://gist.github.com/92899e26d2e35897714c
What else do I need to change to get port 4 to be WAN and wired ports 2-3 to be LAN (onto 192.168.1.* network)?
edit:
Apparently I need to add another VLAN for local Ethernet ports, other then the "new WAN" (port #4). That's because PC gets an IP over Ethernet directly from WAN, and I need PC to be on LAN (192.*) network.
But my router doesn't have a VLAN admin GUI, though it's of the same version – v24 preSP2.
I followed all the instructions to separate Ethernet ports into different VLANs, and still no luck, PC still grabs an IP from my ISP as if the router was a simple switch.
Best Answer
Sounds like you haven't configured the LAN ports correctly yet. The ports are still acting like a hub and not like a firewall; hence the PC grabbing the external IP. As far as I know the areas to look into are VLAN(which you're already doing) and global router settings(like if it's a bridge, gateway or router).
Have you tried again with the latest firmware?