Home Network internet not working!

[jelky]

I'm not sure where to post this but I need help.

My internet stopped working. I have 2 computers wired and 1 wireless laptop. From the cable modem to laptop I can get internet to my laptop wired, from the router to laptop I can get internet. 1 computer is in a room, no internet, I try plugging in my laptop there and I can get internet, same with the other computer too. So the laptop seems to work for some reason, but I can't get my desktops to work. I even tried connecting an old desktop pc and that couldn't receive internet. I tested all my cables and they all work. Atm I have a cable modem to an 8 port switch. Before I had cable modem to a 4 port router, a cable from that router to a wireless router that had 4 ports too. I couldn't get internet working from either of the 4 port routers wired to the laptop. I'm very confused why the laptop receives internet but I can't get my desktops to. I've been trying to figure this out for 8 hours now!

Thank you

 

[FragTek]

Are you running DHCP on the router? If so are your desktops configured to use DHCP? If they are using static IP's are you sure they are in an acceptable IP address range for the router.

Have you tried a hard reset / restore on the router?

You may also try releasing and renewing the IP address on the router to your modem.

 

[jelky]

I don't know if I'm running DHCP on the router. And idk if the desktops are configured to use DHCP. Maybe they aren't in an acceptable IP address range for the router. The router to my modem now is an 8 port switch I believe and I can't access it I think. Before I had the 8 port switch I had a 4 port router and I can access that, but nothing has ever been changed on it, so Idk why it would need to be reconfigured, also I can't get internet through the 4 port router at all atm.

I've unplugged everything for 10 min+ and reset anything that had a reset button.

 

[jelky]

I have it working as of now. Thank you everyone for the help

 

[FragTek]

I totally missed the part in your post about using a switch. Putting a switch directly behind a modem won't work, you need a router to communicate and direct traffic between the two networks (your LAN and your ISP's WAN). Switches are just used to join LAN segments, so you could have used the switch after your router if you needed to connect more computers than the routers onboard switch had ports for.

 

[hmmblah]

I totally missed the part in your post about using a switch. Putting a switch directly behind a modem won't work, you need a router to communicate and direct traffic between the two networks (your LAN and your ISP's WAN). Switches are just used to join LAN segments, so you could have used the switch after your router if you needed to connect more computers than the routers onboard switch had ports for.

^this.

A switch behind a cable modem will only work for one PC at a time because ISPs only provision one static IP per modem. You can buy more static IPs of course and more PCs will work then with this type of setup, but then you are paying more and losing the security of the firewall in your router.