D-Link Forums
The Graveyard - Products No Longer Supported => Routers / COVR => DIR-655 => Topic started by: SoHo1 on August 31, 2013, 08:36:57 PM
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I found this post useful to my debugging, but it did not contain my answer, so I am posting what I have learned to resolve the same issue.
Often, during storms, Comcast internet will go out on me. Basically, what they do is to effectively re-provision the service. Now the problem with that is during the "troubleshooting" they often get you to remove the router altogether, find the PC still does not connect, then then reset the modem and collect your PC's MAC addr (automatically), which they use to re-provision.
The key for me was that once I understood that, I used the D-Link feature to "copy pc mac addr" to the router and then the router could get a DHCP address from the pool. I verified that using other mac addrs, like the native mac on the router did not work, nor would any other PC mac i had in the house.
So, faking my router's MAC to look as if it were my PC's MAC addr, it got the WAN connection and then everything else on my network was OK. I post, hoping that this helps someone else in the future too.
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Welcome! (http://forums.dlink.com/index.php?topic=41537.0)
- What Hardware version is your router? Look at sticker under router.
- Link>What Firmware (http://forums.dlink.com/index.php?topic=47512.0) version is currently loaded? Found on the routers web page under status.
- What region are you located?
That helps sometimes however most ISPs should need the use of cloning MAC addresses and I don't think Comcast requires this.
There could be other issues as well that cause the internet to go down.
Internet Service Provider and Modem Configurations
- What ISP Service do you have? Cable or DSL?
- What ISP Modem Mfr. and model # do you have?
- What ISP Modem service link speeds UP and Down do you have?
- If this 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 (http://www.practicallynetworked.com/networking/fixing_double_nat.htm) and How NAT Works (http://cognitiveanomalies.com/cisco-nat-how-nat-works/). 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.
- Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values (http://forums.dlink.com/index.php?topic=53008.0)
- For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.
I recommend that you have your ISP check the cabling going to the ISP modem, check signal levels going to the ISP modem. 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. 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.
Also review this and see if any of this helps, sometimes it can:
Router Troubleshooting Suggestions and Tips (http://forums.dlink.com/index.php?topic=54498.0)
Let us know if we can help you more. Maybe someone can review your router settings with you using Link> teamviewer (http://www.teamviewer.com) if your interested. Its safe and secure.
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Any status on this?