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Solved
Cable modem won't connect to Mac with J45
I have a brand new C6300V2 cable modem/router that is connected to my Spectrum service and the wireless part (after some issues) works fine with my desktop Mac and with other devices. But, when I plu...
The end of this story is apparently my Mac was damaged by the lightning strike and the Ethernet (J45 connector on the back) will no longer make a wired connection to the modem/router. I blamed the modem/router at first because I couldn’t get my TV connected to wired Ethernet either, but that was a wiring error on my part. The modem/router device works fine. The lightning took out my old modem/router, either my TV or amplifier ARC function, and my Mac desktop Ethernet port. That much so far.
Case closed.
ps Setup on Mac side it TCP/IP, IPv4 Address: 169.254.9.111, Configure IPv4: using DHCP
all other wired devices work fine?
Just the one mac?
Does that mac work over wireless?
One Mac but my LG TV won’t connect, either, via a wired connection. I thought this connection via a wired J45 connection was automatic. What settings need to be made beyond what I listed? Again, all wireless connections are up and running on multiple devices.
The tv you might need to re-run the network setup process.
On your mac, see if you can go in and clear out the network settings on the mac.
I don't know what you mean by "clear out the settings on the Mac". My settings are:
Location: set to Automatic as before
Configure iPv4: set to Using DHCP
IP Address: not setable but set by DHCP
Subnet Mask: same as above
Router: blank
DNS Server: blank
Search Domains: blank
Limit IP Address Tracking is checked (a security issue)