WRT1900AC Wireless Problems

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DD-WRT Novice

Joined: 01 Mar 2021
Posts: 3

PostPosted: Mon Mar 01, 2021 0:34    Post subject: WRT1900AC Wireless Problems Reply with quote
Long time DD-WRT user, newbie on the forum here.

For 3 years I have had 2 Linksys wrt1900AC routers in my house. One is primary and connected to my cable internet gateway and is configured to support DHCP for all connected devices and is configured to route Internet traffic out as appropriate. The second is configured as a wireless access point connected via ethernet to the primary. The WAP’s only role is to provide wireless access to devices in my house too far away to connect to the primary router. It is set up using: https://wiki.dd-wrt.com/wiki/index.php/Wireless_Access_Point - Normal version (same subnet). My goal is to have seamless wireless access across my entire household using the same SSID supporting 2.4 GHz and 5 GHz devices.

6 weeks or so ago I upgraded both wrt1900AC routers to DD-WRT v3.0-r44715 std (11/03/20). I upgraded because the version I had been using was so old that it had some documented features were not working - particularly NTP. Once the upgrade was complete, I restored the wireless settings to both routers from a backup.

Before upgrading everything worked perfectly and was quite reliable. After upgrading my wireless access to both wrt1900AC routers is spectacularly unreliable. What is confusing is that I used the exact same configuration for wireless access that had been reliable for years. Here are my typical symptoms:

• Ad hoc usage from iPhones, laptops require regular stopping/restarting of WiFi as connectivity simply stops. Every 10-15 minutes.
• Streaming wireless devices seem to be OK like ROKU’s. Once a stream starts its reliable as long as it is in use.
• Smart light bulbs constantly disconnect and stop working.
• Devices like Alexa disconnect and have to be manually reconnected.
• Sonos speakers stop when switching songs after about 10 minutes.
• Devices hard connected to the routers via ethernet cat-6 cables are reliable and work consistently.
• Wireless is the problem. Wired connections are not.
• I have swapped out both devices with backup routers that I had on hand with no change in wireless reliability.

My questions:

• Can I use the same SSID across 2.4 GHz and 5 GHz bands advertised by both routers in my house?
• Any thoughts on troubleshooting the wireless unreliability issues? I am at my wits end.
• I have tried various channel configurations for both 2.4 GHz and 5 GHz across both routers with no effect on the reliability.
• Anything I have missed?

Thanks for reading and any advice is most appreciated.

Joined: 20 Jan 2019
Posts: 3441

PostPosted: Mon Mar 01, 2021 0:43    Post subject: Reply with quote
A reliable fallback is r44048. Use separate SSIDs, but possible to set the same in case some device requires.

Smart home automation, IoT, Apple plus a Marvell WRT is not your friend. Consider a different router, R7800.

08/02/2020 - r44048 | 02/28/2021 - r45863 | Always keep the NTP Server IP/Name field blank in basic setup.

Do not restore backup if configured and created from a different build and/or router! Do not use auto channel.

Consider a hardware reset (hold reset button 10 seconds) or nvram erase && reboot from Telnet as root.

Manually reconfigure from scratch, save progressively then reboot. Create a new backup in the end.

Joined: 29 Oct 2017
Posts: 243

PostPosted: Mon Mar 01, 2021 12:38    Post subject: Reply with quote
I have a similar setup as you except I have a 3200ACM and a 1900ACS as my APs. I run 44048 with the same SSID on all four radios. In my environment, there are lots of IOS and MACOS devices, as well as many IOT devices. I have similar issues as you with any release beyond 44048.

Joined: 01 Jul 2018
Posts: 344

PostPosted: Mon Mar 01, 2021 17:57    Post subject: Reply with quote
If your previous firmware was fairly old there have been lots of changes in the past year. Wireless security especially had options added.

These wireless security settings work best for me for both radios

Security Mode - WPA

Network Authentication
WPA2 Personal - enabled with all others Disabled

WPA Algorithms
CCMP-128 (AES) - Enabled, TKIP - Disabled

802.11r (FT) support - Disable
802.11w Management Frame Protection - Disabled
Disable EAPOL Key Retries - Disabled
DD-WRT Novice

Joined: 01 Mar 2021
Posts: 3

PostPosted: Tue Mar 02, 2021 1:32    Post subject: Reply with quote
Thanks for all three replies. Advice from all three of you integrated into my solution. I reverted both routers to r44048 and the improvement in wireless reliability is remarkable. No dropped WiFi connections with multiple devices since 2PM or so this afternoon.

The help provided is most appreciated. This problem was really making crazy. Nice when a simple solution works.
DD-WRT Novice

Joined: 13 Mar 2021
Posts: 1

PostPosted: Sat Mar 13, 2021 16:20    Post subject: Reply with quote
Hey sport,

I just recently flashed my WRT1900AC v2 to r45229 using Waterfox DD-WRT GUI by disconnecting/unplugging my internet cable and turning off my anti-virus and pretty much anything the looks for bandwidth. Had issues trying to use Firefox, edge and chrome.

Joined: 30 May 2017
Posts: 564
Location: Rural Manitoba

PostPosted: Sat Mar 13, 2021 19:20    Post subject: Reply with quote
I have been using 1900AC's for a few years now and up until r44048 always had to revert to r31924 to use then in my setup. I have tried numerous builds, not the most recent, and always had extremely poor success especially with my remote 1900 500' away in my barn with 5Ghz link. r31924 ran flawlessly. r44048 runs nearly as well but sometimes loses connection and a reboot is required on both the master and slave. Have never figured out why, could be the range (500') as my other 1900 remote has never failed, or possibly a time sync problem. But overall if you follow the advice already given and stick with r44048 you should be pleased. If you do try other builds, be sure to have a backup of r44048 so you can always revert. Unless you are pushing the distance limits, you should be alright though.
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r47608
Ath1 2.4Ghz Disabled
99 Static Leases

WRT3200acm r47608 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40

WRT1900Ac V1 5Ghz r47608 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)

WRT1900AC V1 5Ghz AC 80Mhz WDS Station r47608
2.4Ghz AP Ch1 HT20 Mixed

WRT1900ACS SPARE r47608

WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r47608
2.4Ghz AP Ch1 HT20 Mixed

WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use

3200 Master -> LAN -> 1900ACS -> WDS 5Ghz -> 1900 V1 (X2)
3200 Master -> WDS -> 3200 Slave & 1900V1
DD-WRT Novice

Joined: 01 Mar 2021
Posts: 3

PostPosted: Tue Mar 16, 2021 0:56    Post subject: Reply with quote
r44048 has been the solution for me. Ever since I flashed back to r44048 all of my wireless issues and problems have gone away. Zero drops since the move to r44048.

Thanks to blkt and pbphoto for the pronto advice.
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