Internet Connection Troubleshooting:
STEP #1: Make sure you have wired the FlashRouter correctly with your modem or existing router.
In order to connect your FlashRouter to the Internet you must connect an Ethernet cable from your main modem or router to FlashRouter the Internet port. Make sure you have not connected to a FlashRouter numbered port instead.
STEP #2: Power cycle your network devices.
In many cases you must reboot your modem and/or main router along with your FlashRouter after you have wired the new router into your network. Simply power off all devices then wait 30 seconds and power your network devices back on. Check again for Internet connectivity.
STEP #3: Make sure you do not have a VPN connection conflict.
Now that you are using VPN on your router, there is no need to run any VPN connections, clients, or applications on your computers or devices any longer. In fact, doing so while trying to connect to a VPN on your FlashRouter can cause a connection conflict and loss of Internet connectivity.
STEP #4: Make sure you have no Static network settings on your computer.
In Windows go to your Network Connection and Right Click your active connection then select Properties. Then click on the Internet Protocol Version 4 (TCP/IPv4) and select Properties below; everything should be set to automatic just like in the image included here.
In MAC OS, click the Apple in the top left corner, then go to System Preferences > Network and make sure you have all Automatic Network settings.
STEP #5: Make sure there is no conflict with your main router/modem.
If you are seeing settings for your main network router or router/modem and do not see FlashRouter settings when you enter this IP address into your browser that could mean your FlashRouter has been reset to default settings and now has an IP address of 192.168.1.1, which conflicts with your main router or router/modem network.
If this is the case for you, then disconnect the FlashRouter from your main router or modem/router and then access the FlashRouter settings by wiring directly to a numbered Ethernet port.
You can follow the steps to access your router and proceed with changing your Local IP Address to avoid conflict with other routers or modems in your network:
STEP #6: Does your ISP require PPPoE login?
If you have to enter login information to connect with your ISP then you may have a PPPoE Internet connection type. If you have an existing router that you have been using to connect to your ISP, then you can use the FlashRouter dual router setup. This way you will not have to enter any PPPoE information on your FlashRouter.
Otherwise it is possible to enter PPPoE information in your FlashRouter, but you may need to consult your ISP for troubleshooting as FlashRouters support can not replicate this type of setup for troubleshooting.
In DD-WRT you can enter PPPoE information on the Setup > Basic Setup page, by switching the WAN Connection Type to PPPoE.
In Tomato you can enter PPPoE information on the Basic > Network page, by switching the WAN/Internet from DHCP to PPPoE.
Additional Helpful Links: