The Graveyard - Products No Longer Supported > DIR-866L

D-Link routers loosing routing?

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I am currently using an 866L model router, but have experienced this oddity also with an 850L and also 605L.
They seemed to work fine for 8-10 months, then the oddity started happening randomly.
Its as if its loosing its routing table or something.
on the LAN side, network stays up, can communicate with other LAN devices (ping, file shares, etc) but passes NO Internet traffic.
If I log into the router, I can ping LAN resources, I can ping Internet sites, and all works great. I can even remote into the router and do the same pings with same results.
Historically with the additional model routers, It happened on ALL firmwares, updates, etc. I am a creature of habit, and don't tend to update unless there is "need to." So they had used most updates along with the stock shipping firmwares.
I cannot remember, however, if this route oddity happens to WIRED pc's or if it was just WIRELESS connected pc's.
I hope to collect that detail next time this happens (probably next week sometime) in addition to other symptoms (I've been slacking in this regard).
I wanted to throw this out there to start collecting feedback in case there is a fix that can be applied when I next go onsite to test the wired lan for symptoms.
ALWAYS, a reboot has fixed this issue, until it happens again.


* Main Router and AP Information
* Main Cloud Router Information
* Router Troubleshooting Suggestions and Tips
Good Luck


* 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?
* Are you wired or wireless connected to the router?

Internet Service Provider and Modem Configurations

* What ISP Service do you have? Cable or DSL?
* What ISP Modem Mfr. and model # do you have?

We are using Charter Spectrum Cable Internet services with a static IP, and previously it was a dynamic address type account.
Throughout troubleshooting the past year, as I mentioned, we've used several different router models.
Through additional troubleshooting (not my doing, I am a co-technician that is second in "command") we have had 3 different cable modems.
First, it was a SMC D3GN programmed for dynamic IP.
Second, it was a Motorola or Arris of some sort and used both as Dynamic, then upgraded to static IP.
Now, we have a Ubee model (guessing DDW36C) and will confirm next trip along with LAN routing/lack of routing on wired clients, configured with static IP.
Router is a DIR-866L v A1 and firmware 1.0. I see an update IS available, and will try it, but like I said in OP, I had updated along the way similarly with the other models but continued to have "same symptoms".
Wired to the router, we have 2 workstations, and 1 OpenMesh OM2P Gateway that feeds 3 other OM2P in a mesh configuration.
This mesh provides an SSID for public use for our library, and some of the neighbors use it frequently as well. These users are DHCP via the OpenMesh system almost like a VPN would work, not on the routers LAN DHCP configuration.
There is a hidden SSID that DOES get DHCP from the LAN of the router, and again, I can use local resources on the LAN side of the router, but can't route to Internet when this oddity strikes.
We have configured for use, but rarely use the existing wifi built into the router.
We are located in Pellston, MI USA "The Icebox of the Nation"

I had read on other posts changing wifi settings and am currently on Mixed N and G on the 2.4 and auto channel and auto width, WPA and AES on the 2.4GHz.
On the 5 GHz Mixed A, N, AC and Auto channel and auto width, WPA ad AES.

While typing this post, The router actually did this oddity twice in an hour and needed reboot. There were 6 total clients shown as using Internet while it was up, minimal use at that.

I would try a FW udpate using the following process:
Link> >FW Update Process

Can you confirm the current ISP modem model # your using?

* What ISP Modem service link speeds UP and Down do you have? Link> Speed Testing Sites
* By-pass the main host router and check internet connection by connecting a wired LAN PC directly to the ISP modem to verify connection access and ISP speeds.
* Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.
* Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values
* For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.
* If the ISP modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>Double NAT and How NAT Works. Call the ISP and ask to see if the ISP modem can be bridged. To tell if the modem is bridged or not, look at the routers web page, Status/Device Info/Wan Section, if there is a 192.168.0.# address in the WAN IP address field, then the modem is not bridged. If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ. Also check the routers DHCP IP address maybe conflicting with the ISP modems IP address of Check to see if this is the same on the ISP modem, and if modem can't be bridged, change the DIR router to or .0.254.
Example of a D-Link router configured for PPPoE with ISP Modem bridged: PPPoE Configuration on a Router

I recommend that you have your ISP check the cabling going to the ISP modem, check signal levels going to the ISP modem. For DSL or Fiber service lines, ensure that the ISP is using good working phone or cable lines to the DSL modem and that the phone lines are filtered correctly. For cable Internet, RG-6 coaxial cable is needed, not RG-59. Check for t.v. line splitters and remove them as they can introduce noise on the line and lower the signal going to the ISP modem. I recommend having the ISP service physically check the lines going from the out side to the ISP modem. Connecting to the ISP modem could result in a false positive as the signal to the modem could be just enough to that point then adding on a router, could see problems. The router operation is dependent upon getting good data flow from the ISP modem and the modem is dependent upon getting good signal from the ISP Service.

I would troubleshoot this by disabling the WiFi temporarily to see if the problem is seen online on wired LAN first, then test wifi.

We have updated Firmware to the latest version, disabled the wifi, and now sit and wait to see if it goes down.
I have checked the MTU of 1500 with Charter Spectrum, in addition to Bridged mode for our static IP--all is correct.
They checked signal for loss and strength last month when they replaced the modem with a Ubee DDW365 and all was well within specs on RG6.
Regarding the LAN: we confirmed that Internet is not accessible for BOTH wired and wireless interfaces until a reboot, Intranet is fine.


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