How do I use WDS?[toc, link]
Here's an example basic 2-router setup as configured in the Basic/Network page:

#1 - 00:11:11:11:11:11
The WAN port of this router is connected to the Internet.
WAN
(configure normally)

LAN
IP Address = 192.168.1.1
DHCP Server = enabled

Wireless
Wireless Mode = Access Point + WDS
SSID = samessid
Channel = 3
Security = WPA Personal
Encryption = AES
Shared Key = samesharedkey
WDS = Link With
MAC Address = 00:22:22:22:22:22 (the *wireless* MAC of the 2nd router)

#2 - 00:22:22:22:22:22
The WAN port of this router is not used.
WAN
Type = Disabled

LAN
IP Address = 192.168.1.2
Default Gateway = 192.168.1.1 (the 1st router's IP address)
Static DNS = 192.168.1.1 (the 1st router's IP address or any DNS server)
DHCP Server = Disabled (the 1st router handles it)

Wireless
Wireless Mode = Access Point + WDS
SSID = samessid
Channel = 3
Security = WPA Personal
Encryption = AES
Shared Key = samesharedkey
WDS = Link With
MAC Address = 00:11:11:11:11:11 (the *wireless* MAC of the 1st router)
Once you configure #2, you can hook up wired computers on it or use it as a second AP to extend your LAN's wireless range. As long as you configure your notebook not to stick to a single MAC address, it should switch automatically to the strongest signal as you move around.

You can chain several more routers this way by changing the WDS' MAC address field.
#1 --- #2 --- #3

#1
/ \
/ \
#2 #3
But avoid creating loop or a situation where there are multiple paths.
#1
/ \
/ \
#2 ---- #3

#1
/ \
/ \
#2 #3
\ /
\ /
#4
If you have to do this for link redundancy, try enabling STP in Advanced/Routing to avoid problems.