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[terminallyCapricious]

Hi, this suddenly happened to me in the middle of the afternoon today. I have a DIR-655, hardware version B1, with 2.11NA firmware.

I suddenly lost connection on my machine (and all other machines in the house), including my mobile - I'm posting from that at present, so I'm sorry if the formatting here leaves something to be desired.

Anyway - I restarted the router remotely at first, connecting  thru the browser admin panel, as this usually fixes things. This time, it didn't!

Thinking it a bit odd, as nothing was wrong with the network configuration/dhcp settings, I checked to see if the router itself could connect to the Internet using its ping tool, and it could!

Thinking this a bit odd, I power cycled the router and modem  to no avail. The router could still ping the outside world, but all the machines connected to it were out of luck. Connecting directly to the modem also lets the one machine connected access the Internet, but that's not exactly a tenable solution.

Searching for "router can access Internet but computer can't" was pretty fruitless, so I'm posting here now. Literally nothing has changed in my router's settings between the instant it was working and the subsequent instant it wasn't. Power cycling and restarting does nothing, for router, modem, and computers alike. Wired and wireless connections are equally non-functional thru the router. So, uh...

What caused it to mysteriously and suddenly stop working?

[FurryNutz]

• What region are you located?

Do a IPCONFIG /ALL in a command line box from a wired PC connected to the router. Do you get an IP address and information?

Internet Service Provider and Modem Configurations

• What ISP Service do you have? Cable or DSL?
• What ISP Modem Mfr. and model # do you have?
• Is ISP Modem/Service using Dynamic or Static WAN IP addressing?
• What ISP Modem service link speeds UP and Down do you have? Link> Speed Testing Sites
• By-pass the main host router and check internet connection by connecting a wired LAN PC directly to the ISP modem to verify connection access and ISP speeds.
• Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.
• Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values

Router and Wired Configurations
Some things to try: - Log into the routers web page at 192.168.0.1. Use IE, Opera or FF to manage the router. Besure to log into the Admin account on the router.

• Enable or Disable Use Unicasting (compatibility for some ISP DHCP Servers) and test under Setup/Internet/Manual. Disable may help with speed performance on higher speed ISP services.
• Turn on or off DNS Relay under Setup/Networking. Link>Finding Faster DNS Addresses using Name Bench and input new DNS addresses under Setup/Internet/Manual.
• Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting and maintain consistency for applications that need to connect as well as mapped drives.
• Ensure devices are set to auto obtain an IP address.
• If IPv6 is an option on the router, select Local Connection Only under Setup/IPv6.
• Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall. Enable or Disable SPI to test.
• Enable uPnP and Multi-cast Streaming under Advanced/Networking. Disable uPnP for testing Port Forwarding rules. Enable IPv6 Multi-cast Streaming for routers that have a Media Server option. Disable IPv6 Multi-cast Streaming if IPv6 or Media Server is not being used.
• Turn off WISH, and WPS under Advanced.
• WAN Port Speed set to Auto or specific speed? Some newer ISP modems support 1000Mb so manually setting to Gb speeds can be supported by the router. Advanced/Advanced Networking/WAN Port Speed
• Set current Time Zone, Date and Time. Use an NTP Server feature. The DST setting is only needed in the NA region. Tools/Time.

[terminallyCapricious]

Thanks for the response - I got it sorted, though. When I said literally nothing had changed, I meant nothing that I'd checked or thought to check - apparently QoS and access control ticked themselves on. I never looked there because I had no reason to think they'd toggle themselves on with no user input.

Nobody but trusted people have been on the network, as best I'm aware, and only one other person has access to the router and they didn't do it (given that they couldn't do remote access at the time it happened, and also said they didn't) so the fact that these settings turned themselves on is still pretty odd. Fitting that it was something so baffling, though, as nothing immediately sensible helped.

[FurryNutz]

There must have been user intervention. The router FW does not enable options if they are disabled.

Glad you got it figured out. Come back to the forums if needed. Enjoy.