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I have a Belkin Connect N150, plugged into a hub, which is plugged on a Speedtouch modem. The hub have many other nodes connected to, possibly with wireless routers too. I only have access to my equipment (the Belkin, and my PC, which is running Windows 7 x64 -- firewall disabled) and the hub.

From time to time, something prevents me from connecting to the Internet. When this happens, I restart the modem, and then everything works again. Sometimes, things get more serious, and I have to also unplug everything from the hub, and then plug them again. Unfortunatelly, from time to time nothing works, and I have to wait until my router gain connectivity again. During this downtime, my PC can't ping the modem.

I just found out that if instead of this setup I just plug my PC on the hub, bypassing the router, everything works fine! Sometimes, if I switch back to the router, then it works, but most of the time it does not. I havew nmap installed on my PC, but don't know what to look for.

I want to know what is happening, not only to fix this problem but also to learn more about these things. Any ideas?

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Time to get a new switch. . . They sell for cheap on craigslist –  surfasb Oct 6 '13 at 2:31

1 Answer 1

The fact that your pc works flawlessly when plugged into the switch directly, while it occasionally cannot connect to the router when it connects thru the Belkin, makes me suspect this might be a problem with IP addressing. So I am wondering whether, by anyc hance the IP range used by the Belkin is identical to that used by the Speedtouch. Out of the box, most modem/routers offer just two ranges: 192.168.0.0/24 and 192.168.1.0/24. If they are using the same range, there's bound to be problems which would however disappear when the pc is directly connected to the Speedtouch because it is then assigned a unique IP numebr by the sole DHCP server operating on the LAN in this configuration.

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Nope, that's not the case. The Speedtouch uses 192.168.1.*, while the Belkin resides in 192.168.2.*. But, what if there is another router somewhere on the LAN which uses the same range? –  Metalcoder Oct 7 '13 at 11:45
    
This will give rise to conflicts, which cause hard-to-diagnose dysfunctions in a network. –  MariusMatutiae Oct 7 '13 at 12:25

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