Comcast XB3 cable modem not playing nice

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brainwave89

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Aug 6, 2007
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I have a Comcast XB3 cable modem, TP-Link D7 AC1750 wireless router and Linksys 10/100 16-port switch. I decided I needed to upgrade my equipment. I purchased a Netgear 16-port (unmanged) switch and a Edgerouter X. I have two UniFi AP's. Before replacing the TP-Link with the Edgerouter X I installed the Netgear switch. When I hooked up a cable from the TP-Link to the Netgear switch the Ethernet port that I was using successfully from the TP-Link stopped working. When I disconnected the cable from the switch I had internet access again. The same thing played out when I hooked a brand new 5-port (unmanaged) gigabit TP-Link switch.
When I hooked-up the Edgerouter X replacing the TP-Link wireless router I was able to access the internet briefly with an Ethernet cable from the Edgerouter X to a laptop but will stop working within a minute.

When I plugged back in the TP-Link wireless router and Linksys 10/100 switch I was able to have access to the internet again when wired from either the TP-Link or the Linksys switch.

Would might cause the new equipment not to stay online when using a wired connection?
 
Joined
Sep 21, 2007
Messages
14,541
Maybe cable problems? Try a new cable. Although less likely in ethernet cables, I find old cables get bent into a fixed position which they then prefer.
 

Fireflycph

Morten
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Apr 1, 2016
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Not all switches can be "daisy-chained" Some have a specific Uplink port that must be used to connect to another switch. Generally, I believe it is the case with older switches. If they're newer you certainly should be able to connect them together. You can also try to use a cross-over cable. I've had success using those on equipment that wasn't supposed to work together.
 
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