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How to fix Asus DSL-AC68U slow Wi-Fi problem

Fix ASUS DSL-AC68U slow wifi

If you have problem that your Asus DSL-AC68U:s Wi-Fi is really slow on  2.4GHz band, here is one trick that can fix it. I ran into this problem when i connected my older laptop and Wii U to Wi-Fi. Wii U couldn't keep up the connection and when it could, it was really really slow. First i thought that the problem was Wii U:s poor Wi-Fi, but after i connected my older laptop to Asus i noticed that Wii U wasn't only device with that problem. Wii U and laptop both has older Wi-Fi adapter so it could only connect to 2,4GHz band and problem occurred only there.

1. Access the router web panel by going to http://192.168.1.1 with your browser. Default IP is 192.168.1.1 and default username and password is admin/admin.

Asus DSL-AC68U login window

2. Navigate to Advanced Settings -> WAN.

Asus DSL-AC68U - WAN settings

3. You should see one entry on PVC Summary and it should have 802.1Q Enable set as No. Click Edit PVC icon.

Asus DSL-AC68U - Edit PVC settings button

4. Change 802.1Q Enable to Yes and hit Ok.

Asus DSL-AC68U - Enable 802.1Q option

5. Reboot router.

Asus DSL-AC68U - Reboot button

Now you might think "What is 802.1Q and what i just did?" and here is the answer: IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network. The standard defines a system of tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.

By enabling 802.1Q it fixed all speed issues on 2.4GHz band. Why it is affected with this setting? I don't really know, but i know that it fixes it.

15 Comments

Brendan - Posted 2 years ago
Anyone able to find a fix for this recently? I have a DSL-AC68U which I don't use the modem function and when I enable this fix it just kills the connection. 2.4GHZ is unusable but 5GHZ is fine.
Helpme - Posted 3 years ago
After enabling 802.1Q it says Your isp´s dhcp does not function properly and internet doesnt work. Please help
Nishanth Rajendran - Posted 3 years ago
in my router page in wan type it shows "DSL" "ADSL WAN(ATM)". As u said i just enabled the setting and rebooted the router i lost my internet connection. Do you have any better suggestion for my case???. Thanks in advance
Wiretuts - Posted 3 years ago
Do you have latest firmware? Cause i noticed that latest firmware made lots of changes to previous version
Roberto - Posted 3 years ago
Saved me, thank you so much!
Wiretuts - Posted 3 years ago
No problem man!
Jeff Zurawski - Posted 3 years ago
Once I realised my buffering issue with iOS on wifi LAN was router related, specifically DSL-AC68U, Google brought me here and this solution fixed my problem.
Trying to stream Plex media from remote PMS on my LAN was near impossible, hopelessly slowed by constant buffering. I didn't realise it was the router untill I tried to stream on mobile network and all worked fine.
It never used to be a problem, but enabling 802.1Q sure fixed it. Thanks
Wiretuts - Posted 3 years ago
No problem! This was so hazard problem and when i found the fix, i had to share it with everybody.
ireadtabloids - Posted 3 years ago
Absolute legend!!!!!! Saved my bacon. Wish I'd stumbled across you five hours earlier. No idea why this works, but thank you!!! Master legend.
Jake Perren - Posted 4 years ago
Mate you are a deadset Legend!!!!!!Well done great post, perfect fix
Jari Nieminen - Posted 4 years ago
Thank you!I rarely bother to response to these threads, but now I simply must in case it might help someone else:In my case the problem was slow download speed on Wifi - both 2.4G and 5G. But ONLY on Windows OS. Tested on WIN7 and WIN10, both slow while OSX and all other devices on my network had normal speed. Speed with ethernet was always normal, and the upload speed was normal on Wifi as well.My Asus router did not have the setting above at all(?), the whole "PVC summary" entry was not there. Adding it fixed the problem with Windows clients, and all other clients kept the same good normal speed.Now my download is about 20x faster on Windows. One can find a lot of suggestions on the internet while Googling, but in my case this trickery was the solution. Go figure.
forbsy - Posted 4 years ago
If the setting for PVC Summary wasn't there, how did you find/add it? I don't see it anywhere.
Jari Nieminen - Posted 4 years ago
Navigate to the correct page WAN --> Internet connection and click the Add/delete 'plus' button to add a new 'PVC Summary'. Then follow the original instructions from step 3.
forbsy - Posted 4 years ago
I don't have any add/delete plus button in that section. I'm not on DSL btw.
Steven Ross - Posted 4 years ago
OMG this was SO SO helpful for me. I have a RING doorbell that would not work and have been on with tech support for about 6 hours. Nobody could figure it out but this fixed it. Thank you! Thank you!