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Consider the following setup: 2-3 Laptops and 4-5 Desktop PCs (both windows and linux systems) are connected to an ADSL modem/router (http://avm.de/produkte/fritzbox/fritzbox-3272/) via wireless and LAN. The LAN network consists of 2-3 switches of questionable quality as well as lan cables in awful conditions.

Now everything worked fine until someday the internet connections stopped working with limited connectivity errors in windows. I did some of the usual router on/off cable in/out tests and everything worked fine again. Next day I got a call again, internet not working. This repeats for like 5 times and right now I figured the following pattern: If I plug a device directly (no switch inbetween, no wifi) in the router lan port, connections work instantly and fine. If I unplug the device then, wifi and LAN via switches works directly after. But then, after some time, limited connectivity again. This is so hard to fix since I get everything to work, leave, and the problems occur sometime after that.

My main question is, is this certainly a router problem, or is it possible that some device in the network (broken cable/switch, infected pc or whatnot) causes routing issues for the entire network?

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  • What IP addresses does the windows PC have, when it reports connection errors? Can you ping the fritzbox? Does Name resolution work? Is there a rouge dhcp server?
    – Jonathan
    Sep 17, 2014 at 8:47
  • Are they connecting both Wifi and LAN at the same time through the same network? Also, what device does DHCP and are there enough free slots to give out IP addresses? It sounds like either the DHCP lease is not being renewed and/or an ip conflict.
    – LPChip
    Sep 17, 2014 at 10:48
  • @Jonathan I'll report back as soon as another error will occur
    – sweetguest
    Sep 17, 2014 at 11:30
  • @LPChip No single device is connect with both wifi and LAN, but the Router is managing both (and also responsible for DHCP) I can also see the connected devices on the router frontend with no obvious ip issues (all ips are unique)
    – sweetguest
    Sep 17, 2014 at 11:34
  • @sweetguest do you have enough free DHCP slots available though?
    – LPChip
    Sep 17, 2014 at 12:57

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