Don't forget wireless security
If you have a security issue a 2nd router is not your best solution. The only way to make sure unauthorized users cannot use your wireless router is to secure it. You must (1) make sure you have a unique SSID, (2) activate WEP security, (3) use MAC filters to restrict access to designated MAC addresses, and (3) do not broadcast your SSID. This should handle the neighbors.
With regard to connecting your two routers properly, the D-Link Knowledge Base has a procedure to accomplish this. The was under their notes for a DI-624 wireless G router.
http://support.dlink.com/SupportFAQ...DI-624_revC (Advanced features/DDNS..)
Their first recommendation is "don't do it". There may also be issues with connecting unlike router brands. Here's what they say:
"
Use router as Access Point / Switch:
It is STRONGLY recommended that you do not use 2 routers. You may want to return it and purchase an access point (wireless) or a hub/switch.
To use your router as an access point only, please follow the steps below:
Router A is the router you want to use as the router - connected to the modem.
Router B is the router you want to use an access point or switch.
Step 1 Do not use the WAN port on router B.
Step 2 Depending on your network setup, you may need to change the LAN IP address of router B. The default is 192.168.0.1. If you are using another router, DHCP server, or Internet connection sharing software, change the LAN IP address of the router to an IP in your subnet (192.168.0.2). The LAN IP address must be static.
Step 3 Disable DHCP on router B. To disable DHCP, go into the routers configuration > Home > DHCP. Click Disable and then click apply." ***End of D-Link advice