Change ZyXEL 645ME+, 645R, or 642R into Bridge Mode

1. First connect your modem to your computer with the cable that came with it.
2. Then go to Start > Run, then type "Telnet 192.168.1.1" then click ok.
3. You will then be prompted for a password. Enter "1234" You will now be in the modems main menu.
4. Main Menu. Select Option 1, then choose ROUTE IP=NO and BRIDGE=YES.
(Use the arrow keys to move the cursor and the spacebar to change the values)
Move cursor to "Press ENTER to Confirm or ESC to Cancel:" Press enter to save.
5. Main Menu. Select option 4 and change the "Encapsulation" to "RFC 1483".
6. Main Menu. Select Option 11, then option 1. Choose ROUTE=NO and BRIDGE=YES.
(Use the arrow keys to move the cursor and the spacebar to change the values)
Move cursor to "Press ENTER to Confirm or ESC to Cancel:" Press enter to save.
7. Be sure to hit Enter and not Esc after you make your changes!
8. Main Menu. Select Option 99 (exit)
9. Now connect your modem to your routers WAN port and your computer to one of it's LAN ports.
10. Restart the Computer or run "ipconfig /renew" or "ipconfig /renew_all"
11. Connect to your Router, the Routers IP is usually the Default Gateway of the Computer, try "ipconfig /all | more"
12. In the router's menu select PPPoE login and enter you user name and password that you set up with Sprint.
13. Save the changes in your router's menu and exit out.
14. You're done!
(Note: Router section is optional. You could also use Windows ICS and/or a software PPPoE client at this point)

Source: http://www.dslreports.com/faq/sfc/5.+Hardware

Personal note:
Some new Routers have additional NAT settings that need to be disabled. Updates will be posted soon.

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