We have a Comcast modem / router (Cisco DPC3941B, 4 port, DOCSIS 3.0) and on the LAN side, a 24 port 10/100 netgear switch. Everything works great. We went to upgrade the swich to a Ntegear 100/1000 switch. I plugged everything in and the LAN side seems to connect fine, but the Comcast modem doesn't seem to want to talk to the new switch (no internet connection). I can plug a computer directly into one of the modem ports and get a gig connection, but can't get an internet connection through the switch. The switch is un-managed, so should just be plug and play. Am I missing something? I put the old switch back in for now and everything works fine.
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