How to configure D-Link DSL-2320B modem for att.com

Some things to try:

Software:

• WinRouter Restarter
• Imran's Broadband Helper Utility

Telnet:
(according the product page telnet remote management is supported)
so try this in a command prompt:

1. Telnet "the ip of your router" (generally 192.168.1.1 or 192.168.0.1)
2. You will be prompted for user name & password (if it's not set, generaly admin/admin or root/root or look in the manual)
3. Try "reboot" or "restart" (or "help" or "?" to find the similar command)

If it's succesful you could use tst10 to create a script and add it to your scheduler (you could also test your connection in the script...)

Web interface:
differents ways:

• Sometimes the reset command is called by a simple html, so a shortcut to this page (in scheduler) will do the trick.
• With the firefox extensions Live Http Header or FireBug you could inspect what's sended by the web interface when you reboot the modem, to reproduce it in a more convenient way
• Sikuli (script engine using screenshots)
• Autohotkey (powerfull script/macro engine)

What is happening here, is that your modem is slowly desynchronizing from the ISP. This desynchronization causes packets you are sending and receiving to become corrupt, requiring them to be resent, and thus, lowering your speed.

To fix this issue easier, I suggest a simple solution. Get one of those outlet timers that people use for when they go on vacation and want to have lights turned on. Then set it to power the router from, say, 4:16am to 4:15am, so that it is powercycled during a time you're not going to be using it in the first place.