Posted: Sat Nov 17, 2018 18:45 Post subject: Sudden Loss of Bandwidth on DLink DIR-890
My DLink DIR-890 router has been running flawlessly after having updated to the latest firmware 5 months ago. It is sitting behind AT&T’s Pace 5268AC serving up their 1GB fiber service. I routinely got 800-900MB down on a hardwired PC downstream from the DIR-890, until a few days ago. Now, I’m barely getting 40mb down. This speed was also verified from the ATT gateway’s built-in speed test, so I suspected the issue was with the ATT equipment.
ATT said they showed errors on the line and sent out a tech, who replaced the fiber ONT, which restored their gateway speedtest to correct levels. The tech tested out and verified proper speeds immediately inside on their gateway ports, so it would appear their stuff is good. Yet speeds from the dd-wrt built in test still shows 40mb, and verified from a hard wired PC.
What could have gone belly up? DIR-890 firmware is DD-WRT v3.0-r36168 std (06/20/1.
Not looking forward to ripping out my wiring closet to troubleshoot, but is there somewhere in the configurations that I could review first?
Joined: 23 Jul 2017 Posts: 733 Location: Brisbane, Australia
Posted: Sun Nov 18, 2018 3:45 Post subject:
You should be able to connect a computer or laptop directly into the ONT to check its speed. To connect up a Windows computer:
Connect your computer to the ONT’s WAN port using ethernet cable.
Open to Settings, and click Network & Internet.
Click Dial-Up to open up settings for modem based connections.
Click Setup New Connection. A new window will open.
Select Connect to Internet and click Next.
When it asks “How do you want to connect?”, click Broadband (PPPoE) option.
Now enter your user name and password that your ISP provided you.
Now run Speedtest.
If speed is OK, unplug the cable from your computer and plug it into the WAN port of your router and switch on the router.
Connect your computer to the router with an ethernet cable.
Load the router management GUI, and navigate to the Setup / VLANs tab
On the line “Link Status” check the coloured block below Port “W”. It should be green, indicating a gigabit connection. The port connected to your computer should also be green for gigabit. If you can't get these indicators, reset your router to factory defaults and reflash it. Run Speedtest on the computer and router.
Everything I’m testing is hardwired - no Wi-Fi involved.
So, can I go from a current beta version (is it brainslayer that’s downloaded here?) right into a Kong firmware? I looked into Kong’s some time ago before SFE was available, but loading it wasn’t overly apparent.
But my question stays the same: what would cause a solid, working dd-wrt install suddenly go into the tank? Since I haven’t messed with configurations for some time other than an occasional reboot, it seems like there would have to be some external interaction causing this. I do use a ddns service, and use OpenVPN to allow remote access into my network, and have a few ports forwarded. Grasping at straws, here.
Joined: 23 Jul 2017 Posts: 733 Location: Brisbane, Australia
Posted: Wed Nov 21, 2018 8:40 Post subject:
Kong builds can be installed from a Brainslayer build using the “Firmware Upgrade” tam on the Administrator panel, no issues.
Kong prudeces builds for a li ited number pf routers which he owns. He tests his builds before uploading them to a TEST folder, where other users test them before they are copied to the main downloads folder. The testing time is generally shortened when the bulids include important upgrades or security patches but for the limited devices he supports, the firmware is generally very sound.
Brainslayer, on the other hand, supports hu dreds of makes and models, and to be able to produce the builds he does they must be produced by scripts. He frequentls produces builds which are too big to fit into older routers, work fine on some models and crash others. Builds can be good, bad, or indifferent depending on your router and model. I din't think any of them undergo any specific checking or testingbefore they are released for download, and it is up to the user to check the forums for signs of trouble. And as far as I know, shitty firmware is not delated from old download folders.
Having said that, enabling the SHortcut Forwarding Engine option in the basic settings tab can speed your WAN. SFE is a softwaree version of proprietary hardware NAT used by router manufacturers to speed up throughput. However QOS and SFE do not play well together, and if you enable QOS you might fine SFE does not work.
I hope some of this works, I am starting to run out of ideas . BTW I have a Netgear R8000 that runs really well on the Kong builds... it is similar hardware to your router. 5GHz wifi is a little fussy though, which is why I asked.
I erased nvram after loading dd-wrt, then restored from a backup (taken when the router was working at full speed).
Knowing that factory firmware works, I hate to go to the expense of replacing the router only to end up with the same results, but may need to try. To have something that was working suddenly degrade like this still makes me think there’s a hardware issue.
The only other things in the setup that I can think of would be:
- erasing nvram isn’t fully doing its job.
- an auto firmware update to the AT&T modem that has something obscure that dd-wrt doesn’t like.
I use the Velop mesh network gear for Wi-Fi and so have that portion of my router turned off. Is there a good gigabit router suitable for dd-wrt that does not have Wi-Fi capability?
Didn't really matter in this case, egc. Further up, I mentioned that speedtest reflected the same poor speeds right after applying the factory-to-ddwrt.bin file from DLink stock, even before applying any settings or restores.
Dunno... Something has just gone belly-up for no apparent reason, after at least 5 months of solid performance. Doesn't make sense, and I'm at a loss on what else to try at this point.
I may have touched on the issue earlier - I stumbled on a rash of recent posts online that exactly mimics my situation. It appears that sometime in October, AT&T issued a firmware update to their 5268ac that has messed with DMZ Plus mode, effectively capping folk’s bandwidth to around 50mb. After having operated fine for a period of time, people started experiencing this issue with no change to their setup.
True to form, AT&T is not addressing the issue, and their tech support is blaming it on everyone’s router.
In DMZ Plus mode, I used to give my router/internal network a different IP scheme than that of the gateway’s default IP. So, not being a firewall guy, if I remove my router from DMZ Plus, how could I create a hole in the AT&T gateway for all ports and services without getting into a double NAT situation?
I think they have other hardware that uses IP pass through instead of DMZ Plus. Would that be a better option if I could get them to swap It out?