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The Graveyard - Products No Longer Supported => Routers / COVR => DIR-868L => Topic started by: tjj92 on March 03, 2019, 08:44:00 AM

Title: Router crashing whenever 2 specific devices connected to 5GHz
Post by: tjj92 on March 03, 2019, 08:44:00 AM

I just gotten a new OnePlus 6t phone and I realised whenever it attempts to connect to the router, my whole router will reboot and then it manages to connect.
After a lot of testing, I figured out more regarding my problem.

It seems that whenever my MacBook is connected to the router (macOS or Windows), and then followed by my phone, it will crash the router.
When my phone connects to the router and then followed by my MacBook, both will just connect fine.
If my MacBook is set to static IP instead of DHCP, my phone can connect after my MacBook without any issue.
If my phone is set to static IP instead of DHCP, my phone will still crash my router if connected after my MacBook.

If I turn on WLAN partition on 5GHz network, everything seems to work fine.

This issue only happens if both devices are on the 5GHz network btw.

Is there any way to resolve this issue without turning on my WLAN partition?

Title: Re: Router crashing whenever 2 specific devices connected to 5GHz
Post by: FurryNutz on March 03, 2019, 11:43:27 AM

Link>Welcome! (http://forums.dlink.com/index.php?topic=49573.0)

• What Hardware version is your router? Look at sticker under the router case.
• Link>What Firmware (http://forums.dlink.com/index.php?topic=47512.0) version is currently loaded? Found on the routers web page under status.
• What region are you located?

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.

• Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual or under Setup/PARENTAL CONTROL/Set to>None: Static IP or Obtain Automatically From ISP.
• 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 (http://forums.dlink.com/index.php?topic=45143.0) under Setup/Networking. Link>Finding Faster DNS Addresses using Name Bench (http://forums.dlink.com/index.php?topic=53222.0) and input new DNS addresses under Setup/Internet/Manual.
• Setup DHCP (http://forums.dlink.com/index.php?topic=58017.0) 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 (http://en.wikipedia.org/wiki/Ipv6) is an option on the router, select Local Connection Only under Setup/IPv6.

Wireless Configurations
Links>Wireless Installation Considerations (http://forums.dlink.com/index.php?topic=48327.0) and Managing Signal Congestion (http://forums.dlink.com/index.php?topic=53228.0) and Good Neighbour Policy (http://forums.dlink.com/index.php?topic=10634.0)

• 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 Routers only: Try single mode G or N or mixed G and N?
• 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 (http://en.wikipedia.org/wiki/Wireless_channels) 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 (http://en.wikipedia.org/wiki/Advanced_Encryption_Standard), so you might want to try TPIK (http://en.wikipedia.org/wiki/Temporal_Key_Integrity_Protocol) only or Auto TPIK and AES.
• If you have any of these options, Try turning OFF or ON Short GI (http://www.smallnetbuilder.com/wireless/wireless-features/30969-what-do-80211ns-optional-features-mean-for-you), 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.

Title: Re: Router crashing whenever 2 specific devices connected to 5GHz
Post by: tjj92 on March 03, 2019, 10:12:36 PM

H/W Version:A1
Region:Singapore
Firmware Version: 1.21SHC

It seems that charging my wireless 5GHz to WPA2-TKIP seems to fix the problem. "AES" or "AES or TKIP" seems to crash.
But WPA2-TKIP is very slow.

Title: Re: Router crashing whenever 2 specific devices connected to 5GHz
Post by: FurryNutz on March 04, 2019, 06:45:22 AM

Possible that your devices are not compatible with AES or something between this device and the 868L and AES is causing the router to crash.
Ensure the device is up to date.

You could try a factory reset on the 868L and set up from scratch and see if this changes anything.