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[toeggi]

I'm having an issue with my DIR-865L where it drops the internet connection every 3-4 hours. First, some history:

I bought a new 865L and experienced some issues with the WiFi dropping every now and then as well as the internet dropping every 3-4 hours. Tech support had me upgrade to FW 1.04, but it didn't fix anything. So they had me send it back and shipped me a new one.

Now, with this new one (my current router) I first had an issue with the internet dropping consistently every 5 minutes. Fixed that after roaming the forums here and enabling "Use Unicasting". But then we got the same issue as with my last router where internet (or the connection to my fiber box) drops every 3-4 hours. Now we have to restart the router several times a day, which becomes quite tedious after a while I have figured out that I can fix it by releasing and renewing the WAN IP on the router (Status > Device Info). Tech support had me upgrade to FW 1.04 and then 1.05, but as expected that didn't help. And now they want me to send this router back as well. I'm reluctant to do that because that means 1-2 weeks with no internet or LAN action..

Everything else on the LAN (both WiFi and cable) works when I experience these drops, it's just the WAN side. I have tried hooking up directly to the fiber box when it happens, and I can still access the internet from there.

Any ideas what this can be? I'm thinking it might be as easy to fix as the 5 minute issue I had, but tech support here in Norway won't give me anything other than new FW releases 

More details:

Region: Norway, but my ISP is in Sweden
ISP: Bahnhof 200/20 mbit/s, but the fiber box is delivered from OpenNet (shared infrastructure company)
Fiber box: PacketFront DRG Ease (DRG711)
Internet connection type: DHCP, confirmed from ISP
MTU: 1500, confirmed from ISP
Fiber box lease time: Haven't received an answer from ISP yet (if it's around the same time as my drops, I'm closer to the culprit). It does however say 300 in the log files on DHCP acknowledge between the router and fiber box. But is it minutes or seconds?
Advanced DNS: disabled
IPv6: disabled (set to Local Connectivity Only)
QoS: enabled (read on the forum that it increased available bandwidth on LAN)
SPI: disabled
NAT: TCP and UDP endpoint independent
Anti-spoof checking: disabled
ALG: enabled on PPTP, IPsec, RTSP, SIP
WPS: disabled
UPnP: enabled
WAN port speed: Auto
IPv4 Multicast Streams: enabled
IPv6 Multicast Streams: disabled
SharePort, DLNA and iTunes: disabled

[FurryNutz]

If FW isn't fixing anything, I would presume that there is an issue with the ISP service and or ISP box that this router is connected too. You should have to manually renew or restart these routers. Having to do this tells me that the handshake between the ISP box and this router is not happening automatically or the router is waiting to handshake and waiting to acquire the connection and data.

There was another user on this board I think with a similar issue and it was found that there was a bad infrastructure network switch on his line. He is residing in a apartment complex building.

What is the WAN port speed set for? Try the various option under WAN port speed to see if this might help.
Check the cable between the router and ISP box. Swap out. CAT6 recommended.

Try using the Static IP address option under Setup/Internet/Manual/Connection Types?

I would find out what other problems could be causing this. Test this router at a different location, friend, family place that has Internet and see if the problem follows. I presume it might not follow.

[toeggi]

I tried setting a static IP, but that didn't give me access to internet at all so I reverted back to dynamic. I had the port speed at auto, but I've changed it to 1000 now, and it has been stable ever since - I'll have to monitor it over a couple of days though.

What do you think about the image of the logs below? It seems weird to me that the router checks with the fiber box every 2,5 minutes...

http://cl.ly/image/1m3w3K3W2m01

[FurryNutz]

Ya, wonder if thats coming from the ISP box or router is doing that. You might ask both ISP and DLink support about that.

Keep us posted.

[toeggi]

I haven't had the time to test the router anywhere else. Only thing tech support bothered to ask about was Unicasting. So now they're sending me a new router (again). I'll post an update once I have set up the new one.

[FurryNutz]

How many routers does this make?

If this problem seems to follow on what you have had and on the next one, I think the problem lies up stream from the router and with the ISP services.

Please try to test at a friends or families place if resources are available. Curious to see if this problem follows.

[toeggi]

It'll be the third one. I too think that there must be something with the connection between the fiber box and the router. I got it confirmed from my ISP that the lease time is 300 seconds. My opinion is that it doesn't have to be that often, so I asked if they could increase it. But we'll see when the new one arrives. "Unfortunately" the only thing tech support suggests is to try a new router..

If I have the same issue with this new one I'll definitely try it at a friends house!

[FurryNutz]

Ya, 2 routers and now a 3rd...Ya, something is going on with the ISP I think or in the configuration there of. Seems like the router is probably loosing the connection due to something on the ISP side. These routers are designed to automatically re-gain the connection if there is one and the handshake requirements are met. Meaning if the data and ISP modem connect and sync up, the router will connect and the data will flow. If the router can't connected, it will re-try.

I see there is v1.05 available out now for your region. Not sure if that will resolve anything.

Keep us posted.

[toeggi]

Yeah. Seems weird that it should be the router.

Already got (and tried) 1.05 from support. Didn't do much..

[FurryNutz]

Ok, let us know what the 3rd one does and if you can test at a friends place, hopefully with a different ISP set up and modem. 

[toeggi]

Ok, now this is weird. When I thought I lost all connection to the internet it appears I actually don't. I was working on my company's Citrix platform and was downloading a couple of torrents when I noticed I had lost connection in my local Outlook and I couldn't browse to any websites from my laptop..

So no http (Outlook also connects through http), but the ICA protocol (Citrix) and torrents still work. What's that all about?

[toeggi]

I've got my new router up and running and after 3 hours and 44 minutes I lost the internet connection again...  But as I explained above it seems to only affect http traffic and one of my colleagues suggested it might be DNS related. So now that I had the same issue I tried a different DNS setup on the router - I disabled DNS relay and all of the sudden the "internet connection" was back again without restarting the router.

Now I'll just have to wait and see if that was a permanent fix

[FurryNutz]

Keep us posted.

[toeggi]

Everything has been up and running for 24 hours and 24 minutes with multiple devices connected - all up until I switched on my MacBook Air just now and then we lost internet once again...   Instead of restarting the router I now enabled DNS relay and disabled it again and got the internet connection back, but only for a couple of minutes. Did the same thing again (enable and disable DNS relay) and got the internet connection back once more. I'll see for how long this time.

What is going on?

[FurryNutz]

You used the same configurations on the other 865's?
It could be something with your ISP services. You already send back the other 865?