Stumped: adding a Netgear switch kills my internet connection

[nitsuj3580]

This is really confusing. I needed a few more network ports so I purchased a Netgear GS308 switch.

I have a FIOS Quantum router. Connected to the router I have the following hardwired to it: a SmartThings hub, a HDHomerun Prime, an HTPC, and an ASUS AC68 I'm using as an access point. Everything works fine with this set up.

The problem is I have a powerline adapter I want to use to add a printer to the network in the house. So I bought the switch, unplugged the SmartThings hub from the FIOS router and plugged in a CAT5e cable from the router to the switch. I then plugged the SmartThings hub and powerline adapters into the switch as well.

Once I did this, all devices lost internet. The SmartThings hub went inactive, the HTPC can no longer see the HDHomerun Prime or connect to the internet, and the AC68 doesn't get internet either.

This makes no sense to me. I know all the patch cables I am using work well. Even if the switch is bad, why can I not continue to get internet at the devices that are directly connected to the router?

Any suggestions would be great as I am pulling my hair out with this.

 

[kevnich2]

Try plugging the switch into the router and one computer into the switch and see what happens. Issues like this require some troubleshooting and the best way is to eliminate everything and start adding things in one at a time until you find out what's causing it.

Also - In the AC68 asus router, did you disable DHCP/Firewall and connect the LAN port to the switch? I'd also make sure the LAN IP of the AC68 is different than that of the FIOS router as well.

I had a situation in the past where someone tried doing what you did and originally had their Router/Wireless plugged in with the WAN port and when they reconnected it, connected their switch to the LAN port and both router's had the same LAN IP - result being no internet at all because the network had two 192.168.1.1 devices. The correct way to do is to disable DHCP/Firewall on the secondary router you use for wireless and make sure the IP is DIFFERENT from your main router - or just buy a standalone Wireless AP.

 

[Burner27]

ProSafe switches have default IP of 192.168.1.1 and are DHCP enabled. Change default IP on switch and disable DHCP as kevnich2 said.