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[sfedenis]

I have a DIR-655 and Comcast Cable for my ISP. I use this in my office and run 5 computers and 5 voip (8x8) phones. Everything is hardwired with cat6 cable. On a daily basis, everyone in the office will be working, and randomly everyone will lose internet all at once. The globe will be lit steady and the port lights will rapid flash all at the same speed/time. If I unplug the power for a second and plug it back in, we all have internet back once again. This problem started two years ago, then stopped for 6 months and now is back and not going away. Very annoying especially when trying to run a business that relies on the internet. DLINK customer support doesn't help. All they recommend is a factory reset, update firmware which I've done numerous times, and it fixes nothing. Can anyone help me out with this? Comcast says its the router and DLINK has already replaced the router so It shouldn't be bad.... I don't know what to do. I have a general understanding of networking but seem to always still know more than the reps who try to help and always seem to fail leaving me with this unresolved issue.

[FurryNutz]

Link>Welcome!

Does disabling the wireless radio on the router help? Try a test and see.

• 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?
• Was a Factory Reset performed before and after any firmware updates then set up from scratch?

>FW Update Process

Internet Service Provider and Modem Configurations

• What ISP Service do you have? Cable or DSL?
• What ISP Modem Mfr. and model # do you have?
• Is ISP Modem/Service using Dynamic or Static WAN IP addressing?
• 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 ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values

Wireless Configurations
Links>Wireless Installation Considerations and Managing Signal Congestion and Good Neighbour Policy

• Ensure the default (dlink) SSID name is changed. Ensure that different SSID names are used between each WiFi 2.4/5Ghz radios. Can be anything and not something that's already in use by any neighbouring WiFi routers. Under Setup/Wireless/Manual.
• What wireless modes are you using?
• Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by that maybe causing interferences?
• Any other WiFi routers in the area that maybe causing interferences? Link> Use InSSIDer to find out. How many? Use v3, its free.
• If you have any of these options, Try turning OFF or ON Short GI, WLAN Partition, Extra Wireless Protection and HT 20/40 Co-existence if you have it. Also testing with HT20/40Mhz Co-existence enabled will impact results as well. I prefer to use this option OFF. Recommended settings are default. Under Advanced/Advanced Wireless.

Router Placement
Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
3-6' feet minimum safe distance between devices.
Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-essentials

[sfedenis]

Disabling wirless doesn't make a difference. I'm running ver B 2.11na

[FurryNutz]

Ok,
Please give feedback on the questions presented and lets see if we can help you figure this out. 

[sfedenis]

•What Hardware version is your router? Look at sticker under the router case. B1
•Link>What Firmware version is currently loaded? Found on the routers web page under status. 2.11na
•What region are you located? I'm located in Michigan. not sure what region that's considered
•Was a Factory Reset performed before and after any firmware updates then set up from scratch? Yes I did this with dlink tech support and it didn't help

[FurryNutz]

Ok, please give feedback for the ISP and wireless info as well.

[sfedenis]

Internet Service Provider and Modem Configurations
•What ISP Service do you have? Cable or DSL? Comcast Cable
•What ISP Modem Mfr. and model # do you have? SMCDG3
•Is ISP Modem/Service using Dynamic or Static WAN IP addressing? Dynamic
•What ISP Modem service link speeds UP and Down do you have? Link> Speed Testing Sites 52mb down 12mb up
•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. Speeds were the same at 52 down and 12 up
•Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values UNsure

Wireless Configurations
Links>Wireless Installation Considerations and Managing Signal Congestion and Good Neighbour Policy
•Ensure the default (dlink) SSID name is changed. Ensure that different SSID names are used between each WiFi 2.4/5Ghz radios. Can be anything and not something that's already in use by any neighbouring WiFi routers. Under Setup/Wireless/Manual. Name is changed
•What wireless modes are you using? Unsure what to check
•Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by that maybe causing interferences?
•Any other WiFi routers in the area that maybe causing interferences? Link> Use InSSIDer to find out. How many? Use v3, its free. No other routers in area
•If you have any of these options, Try turning OFF or ON Short GI, WLAN Partition, Extra Wireless Protection and HT 20/40 Co-existence if you have it. Also testing with HT20/40Mhz Co-existence enabled will impact results as well. I prefer to use this option OFF. Recommended settings are default. Under Advanced/Advanced Wireless. Currently Short GI is checked and so is WMM Enable. WLAN Partition is unchecked

[FurryNutz]

Is this your ISP modem?
http://mydeviceinfo.comcast.net/device.php?devid=216

If so, it may have a built in router already...

• 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.

[sfedenis]

Prior to me getting this SMC modem last week, I had a stand alone modem that only had one port and I still had the same issue then as I am now with having to reboot the router everyday multiple times (randomly). 

I see in the firewall settings in the modem, the option is checked next to "disable firewall for true static IP subnet only" and "disable gateway smart packet detection" is checked also.

When I called to have Comcast bridge the modem, I had no connection at all. They said I needed to purchase a static ip from them.

I do see in the modem settings an option for Enable DMZ host and then it allows me to enter an ip address.

In the routers webpage, Status/Device Info/Wan Section, if there is a IP of 10.1.10.10 which is the modems IP. I don't see a 192.168.0.XXX anywhere in there.

[FurryNutz]

Use the DMZ on the ISP modem and place the 655s IP address it gets from the ISP modem into the DMZ on the Modem.

10.x.x.x are private IP addresses along with 192.168.x.x. I think 10.x.x.x are used by CC on there modem/routers.

[sfedenis]

Okay I turned on DMZ in the modem settings and entered  10.1.10.10. It kicked me off and reconnected. Do you think this will solve the problem or is there more to do?

[sfedenis]

These two settings here I have been unsure of as well. One person tells me one thing, one tells me another about what needs to be on and off.
In the router settings, there are two options:

Enable Multicast Streams :on/off
&
Enable IPv6 Multicast Streams : on/off

Which one(s) should be enabled and or disabled?   

[FurryNutz]

We can only hope.

You might want to put one or two wired PCs directly connected to the ISP modem and test to see if those exhibit problems as well while others are connected to the 655. If the 655 shows problems again, check the PCs connected to the ISP modem. if they show similar problems then there is a problem with the ISP modem or service. If the 655 only shows the problem then we'll need to look closer at the 655 configuration and settings.

For now having two routers on line isn't working well and I presume this maybe the root cause.

[FurryNutz]

If your streaming any sort of media content then they should be enabled. If your not streaming via IPv6 then you can leave that disabled. If your not doing any sort of streaming while using external or internal streaming video sources, then you can leave them disabled.

These two settings here I have been unsure of as well. One person tells me one thing, one tells me another about what needs to be on and off.
In the router settings, there are two options:

Enable Multicast Streams :on/off
&
Enable IPv6 Multicast Streams : on/off

Which one(s) should be enabled and or disabled?   

[sfedenis]

I haven't always had two routers. Previous to last week was a stand alone modem and I still experienced the same issues. I will wait to see if it drops connection again and then plug right into the modem when this happens to see if I have connection.