Okay, so you want the DIR-600 to actually act as both a) a router (for you), and b) a wireless client.
Which of the below diagrams is what you want?
Option (a)Code:
+----+ Ethernet +---------+ WiFi +-----------+ +----------+
| PC |----------| DIR-600 |------| Neighbour |--| Internet |
| | | router | | router | | |
+----+ +---------+ +-----------+ +----------+
This is possible, but will need a custom firmware. DD-WRT should be able to do it (if the DIR-600 can run it). Three things to be aware of in this situation:
1) Your DIR-600 will be subject to
KRACK vulnerability unless it's using wireless drivers (in the firmware) that are immune to it. You would need to ask the DD-WRT folks. TomatoUSB (which is an alternate firmware)
IS NOT immune to KRACK in this configuration, so if someone tells you "try TomatoUSB instead for this project",
don't. I've been a contributor to the TomatoUSB project for many years, so I'm being honest. KRACK applies only to wireless clients, which in this situation, is true.
And please, only use WPA2 AES! Do not use WEP, WPA, or WPA2 TKIP.
2a) You will most likely be subject to what is known as "double NAT'ing", which means that some services may not work correctly. I'm pretty sure you know about port forwarding on routers, right? Double NAT means your PC would be behind *two* routers, both with non-routable IP addresses, which means port forwarding has to be done on BOTH routers to reach your PC. Just something to be aware of if you use protocols like IRC DCC, Skype file transfers, or some other things.
2b) This configuration IS NOT a wireless bridge! It's "a router behind a router" configuration. Wireless bridging would allow you and your neighbour to use your wireless routers (your DIR-600 and his/her whatever-router)'s wireless capability to create a bridge, so that there would essentially be only a single LAN. In bridging configurations, the wireless routers **CANNOT** act as _routers_ -- they can only do bridging. If you want a "single LAN" type of situation, then you need to look into buying actual wireless bridges, and you will also need a router (some bridges can do both, as well as offer wireless AP capability, but you need to make sure they can do that before you buy one. Ubiquiti I think makes some devices that can do this). If you want me to draw a diagram of what wireless bridging would look like, just ask.
3) You will probably have to re-configure the DIR-600 to use a different IP range than 192.168.1.0/24 (stock default on most routers), particularly if your neighbour is already using that. I might suggest using 192.168.2.0/24 or 10.0.0.0/8 (although something smaller would be better, ex. 10.10.10.0/24). If you don't understand CIDR notation: /24 means "netmask 255.255.255.0", /8 means "netmask 255.0.0.0". In other words, you'd have something like this:
Code:
PC = 192.168.2.50
DIR-600 = 192.168.2.1
Neighbour's router = 192.168.1.1
Option (b)Code:
+----+ WiFi +---------+ WiFi +-----------+ +----------+
| PC |------| DIR-600 |------| Neighbour |--| Internet |
| | | router | | router | | |
+----+ +---------+ +-----------+ +----------+
Cannot be done because the DIR-600 cannot be both a wireless client (connecting to your neighbour)
as well as an access point (proving your PC with connectivity). Covered this in my first reply.