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[Breaksense]

So I recently bought a wireless router D-LINK DIR-842, and out of a sudden the 2.4GHz band stopped working. And by stopped working I mean that the router shows it's enabled but no device can discover it.

Now for the infos:

What Hardware version is your router? Look at sticker under router.
* H/W Ver.:A1.
What Firmware version is currently loaded? Found on routers web page under status.
* F/W Ver.:1.02.
What region are you located?
* Europe - Romania.

What ISP Service do you have? Cable or DSL?
* Cable (PPPoE).
What ISP Modem do you have? Stand Alone or built in router?
* N/A.
What ISP Modem make and model do you have?
* N/A.

Some things to try:
Turn off ALL QoS or Disable Traffic Shaping (DIR only) GameFuel (DGL only and if ON.) options. Advanced/QoS or Gamefuel.
* QoS off, Traffic Shaping N/A, GameFuel N/A.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual.
* N/A.
Turn on DNS Relay under Setup/Networking.
* On by default.
Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking
* DHCP is on. Need clarification.
Ensure devices are set to auto obtain an IP address.
* Done.
Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall.
* N/A.
Enable uPnP and Multi-cast Streaming under Advanced/Networking.
* On by default.

Wireless Installation Considerations
Ensure WiFi adapter drivers are up to date.
* N/A.
What wireless modes are you using? Under Setup/Wireless/Manual.
* Default (2.4GHz - b/g/n, 5GHz - a/n/ac)
Try single mode G or mixed G and N on 2.4Ghz and single mode N on 5Ghz?
* No effect.
Channel Width set for Auto 20/40Mhz or try 20Mhz only.
* No effect.
What security mode are you using? Preferred security is WPA-Personal. WPA2/AES Only. Some WiFi adapters don't support AES, so you might want to try TPIK only or Auto.
* Cannot choose between AES/TPIK.
What wireless devices do you have connected?
* One smart TV and two Android phones.
Any cordless house phones?
* No.
Any other WiFi routers in the area? Use InSSIDer to find out.
* Yes.
Turn off Short GI, WLAN Partition and Extra Wireless Protection if you have it. Under Advanced/Advanced Wireless.
* N/A.


Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
* Not using firewalls and anti virus programs.
Turn off all devices accept for one wired PC while testing.
* No effect.

Check cable between Modem and Router, swap out to be sure.
* No effect.

Additional info: Tried reset to factory settings, tried changing channels, tried only 20MHz width, disabled coexistence, tried changing transmission power.

The 5GHz band works normally. The 2.4GHz worked, a couple a days ago got some 30m-1h drops then the last night it died completely. Don't know what else to try.

// N/A = inexistent.

[FurryNutz]

Link>Welcome!

• Was a Factory Reset performed before and after any firmware updates then set up from scratch?

  Link> >FW Update Process


Internet Service Provider and Modem Configurations

• What ISP Modem Mfr. and model # do you have?

Wireless Configurations

• What wireless devices do you have connected?
• Any other WiFi routers in the area that maybe causing interferences? Link> Use a WiFi Scanner to find out. How many?
• For routers with Smart Connect Technology , try disabling this feature and test. Under Wireless.

Router Placement
Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
3-6' feet minimum safe distance between devices.
Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-essentials
http://www.foxnews.com/tech/2015/10/27/how-to-get-stronger-wi-fi-signal.html?icid=maing-grid7|main5|dl31|sec1_lnk3%26pLid%3D1839803170

[Breaksense]

There is no firmware update available for my router.
_
The ISP did not provide a modem.
_
I already told you, one smart TV and two Android phones.

Yes there are like 7-8 (the usual, nothing new since 1+ year). Why do you assume people have a wireless adapter? Those programs are useless as I only have ethernet on my PC. I did scan with one of my phones.

I do not have that feature.
_
I tried. No effect.

[FurryNutz]

What channels are the other neighboring WiFi signals using?
What channel is your router set on currently?

[Breaksense]

1 - 1 router
2 - 2 routers
3 - /
4- 1 router
5 - /
6 - 2 routers
7 - /
8 - /
9 - 1 router
10 - /
11 - 2 routers
12 - 1 router
13 - /
I interpreted this from a random WiFi scanner from Google Play Store.
Mine is set to auto.

Here I made some screenshots of my router configuration. Beside the wizard configuration everything else is default.
http://imgur.com/a/KiOL5  - dunno why imgur duplicated them in the album.

[FurryNutz]

Can you chance your router to use channel 13 on 2.4Ghz and test?
One more then to try, do a factory reset, manually load same version of FW, factory reset then set up from scratch:
Link> >FW Update Process

Use IE11 or FF for this...

[Breaksense]

All hail the Flying Spaghetti Monster! It worked! Odd, I've tried reflashing the firmware but when I hit upload it just refreshed the page. Damn Chrome...

FurryNutz, thank you!

[FurryNutz]

Awesome. Yes, I recommend using IE or FF when doing any FW upgrades. Chrome as been known to mess things up. Keep that FW update process handy for future needs. Enjoy the Spaghetti. 

[Breaksense]

I guess I have to start worshipping another deity. The problem is back... Again, last night the 2.4GHz band died. Just died. No warning, no signal/speed degradation, no error, nada...

I'll do the firmware thing one more time, then I'm off to get a replacement (hopefully).

//It drives me nuts because it doesn't show any error or reports any problem... by the way the guest zone doesn't work either.

[FurryNutz]

Ya, seems that this unit needs to be RMAd. Was hoping. 

[FurryNutz]

You might try disabling GZ and just use the 2.4 and 5Ghz radios with out it.

How many devices are connected to GZ when it's enabled?

[Breaksense]

I don't use Guest Zone. I was just trying to see if GZ works on 2.4GHz.

[FurryNutz]

Ok. Seems like something is bad with this unit. I hope an RMA will fix this. 

[Breaksense]

I just enabled SysLog and gave it the PC address as Server IP address. Do you know where it saves the log? Does that log show useful information?

[FurryNutz]

Were you able to get the router to boot and access the UI web page?
You need a syslog capture software installed on a PC and point the routers syslog feature to this PCs IP address while the syslog capture software is running.