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[chanwei21]

Hi, My DIR-842 firmware versions 2.02 B2.
Problem#1: Causes my wireless devices can't connect to my multiple AP devices on the whole building, like DIR-513A.
                  need to log-in to DIR-842 and reboot the DIR-842 so can get normally access again to wifi from the whole building.

Problem#2: sometimes LAN on PC gets no limited connections can't access to internet, can't even load the log in page of DIR-842.
                  need a manual power off to restart the device to let everything getting well.

so eventually this model of router isn't really stable.
I have two of this router in different location building and cause same problem.


hope D-LINK can implement a reboot schedule so I can reboot it daily automatically.

[FurryNutz]

Link>Welcome!

• What Hardware version is your router? Look at sticker under the router case.
• Link>What Firmware version is currently loaded? Found on the routers web page under status.
• What region are you located?

Wireless Configurations
Links>Wireless Installation Considerations and Managing Signal Congestion and Good Neighbour Policy

• Ensure the default (dlink) SSID name is changed. Ensure that different SSID names are used between each WiFi 2.4/5Ghz radios. Can be anything and not something that's already in use by any neighbouring WiFi routers. Under Setup/Wireless/Manual.
• What wireless modes are you using?
• 2.4Ghz and 5Ghz routers: Try single mode G or N or mixed G and N on 2.4Ghz and single mode N or AC on 5Ghz?
• Channel Width set for Auto 20/40Mhz or try 20Mhz only.
• Try setting a manual Channel to a open or unused channel. 1, 6 or 11. 11 for single mode N if the channel is clear. 13 for EU regions. Try channel 48 or 149 on 5Ghz.
• 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 TPIK and AES.
• What wireless devices do you have connected?
• Ensure any devices with WiFi adapter drivers are updated.
• Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by that maybe causing interference's?
• Any other WiFi routers in the area that maybe causing interference's? Link> Use a WiFi Scanner to find out. How many?
• If you have any of these options, Try turning OFF or ON Short GI, WLAN Partition, Extra Wireless Protection and HT 20/40 Co-existence if you have it. Also testing with HT20/40Mhz Co-existence enabled will impact results as well. I prefer to use this option OFF. Recommended settings are default. Under Advanced/Advanced 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.

Hi, My DIR-842 firmware versions 2.02 B2.
Problem#1: Causes my wireless devices can't connect to my multiple AP devices on the whole building, like DIR-513A.
                  need to log-in to DIR-842 and reboot the DIR-842 so can get normally access again to wifi from the whole building.

Problem#2: sometimes LAN on PC gets no limited connections can't access to internet, can't even load the log in page of DIR-842.
                  need a manual power off to restart the device to let everything getting well.

so eventually this model of router isn't really stable.
I have two of this router in different location building and cause same problem.


hope D-LINK can implement a reboot schedule so I can reboot it daily automatically.

[bigchungusmasterv2]

Re: Slow wireless performance while on 5GHz?
« Reply #6 on: Today at 07:13:51 AM »
I found the solution after days of testing.

Same problem. Slow 5Ghz performance, while 2.4Ghz and LAN cable works perfect.
With 5Ghz I was getting only 10Mbps download. With 2.4Ghz 40Mbps and LAN is 200Mbps. My ISP is 200Mbps,

I am on European version.
D-Link DIR-842 Wireless AC1200 MU-MIMO Dual-Band Router
Current Firmware Version:   2.02
Current Firmware Date:   2016-06-14

What you need to do to fix 5Ghz issue is to change some settings through admin panel. So just login to D-LINK admin page and update the settings I will list below.


1) Settings >> Wireless >> 5GHz
802.11 Mode: 802.11ac only
Wi-Fi Channel:   Auto
Transmission Power: High
Channel Width: Auto 20/40/80 Mhz

2) Settings >> Wireless >> WI-FI PROTECTED SETUP
PBC: DISABLED
PIN: DISABLED

3) Settings >> Wireless >> Guest Zone
2.4GHz and 5GHz DISABLED!

4) Settings >> Network >> Advanced Settings
IPv4 Multicast Streams: DISABLED
IPv6 Multicast Streams: DISABLED


5) Management >> System Time >>Automatic Time Configuration.
Update Time Using an NTP server: DISABLED

After updating settings restart the router and 5Ghz will score 200Mbps download now instead of 10Mbps.

[FurryNutz]

What happens if you re-enable IPv4 Multicast Streams? I highly doubt that this will impact 5Ghz performances...

Re: Slow wireless performance while on 5GHz?
« Reply #6 on: Today at 07:13:51 AM »
I found the solution after days of testing.

Same problem. Slow 5Ghz performance, while 2.4Ghz and LAN cable works perfect.
With 5Ghz I was getting only 10Mbps download. With 2.4Ghz 40Mbps and LAN is 200Mbps. My ISP is 200Mbps,

I am on European version.
D-Link DIR-842 Wireless AC1200 MU-MIMO Dual-Band Router
Current Firmware Version:   2.02
Current Firmware Date:   2016-06-14

What you need to do to fix 5Ghz issue is to change some settings through admin panel. So just login to D-LINK admin page and update the settings I will list below.


1) Settings >> Wireless >> 5GHz
802.11 Mode: 802.11ac only
Wi-Fi Channel:   Auto
Transmission Power: High
Channel Width: Auto 20/40/80 Mhz

2) Settings >> Wireless >> WI-FI PROTECTED SETUP
PBC: DISABLED
PIN: DISABLED

3) Settings >> Wireless >> Guest Zone
2.4GHz and 5GHz DISABLED!

4) Settings >> Network >> Advanced Settings
IPv4 Multicast Streams: DISABLED
IPv6 Multicast Streams: DISABLED


5) Management >> System Time >>Automatic Time Configuration.
Update Time Using an NTP server: DISABLED

After updating settings restart the router and 5Ghz will score 200Mbps download now instead of 10Mbps.