I have a port (all wiring is T568A) to my son’s room. My work laptop connects fine. No issues. I can see IPV4 and 6 addresses, DNS etc. His desktop will not connect. Only shows IP6. No IP4, no DNS. We have tried swapping the cable to his desktop and it still makes no different.
Any ideas where to start troubleshooting?
Flash a linux live usb and boot from it. see if it can auto negotiate, so you know if it is a software problem or a hardware problem
I’m also having a very similar issue. Desktop stopped working over Ethernet, cable works on another desktop as well as a laptop. It usually gets an ipv6 address, even though ipv6 is disabled at the router.
Very hard to know what’s going on without more info.
With just this information alone, I would check that a static IP hasn’t been assigned to your son’s machine on your router and on the machine itself. If it has been assigned but another device was allocated that IP already, you will get an issue like this (though, usually, the problematic machine will still report a 169.X.X.X IP).
That’s the best guess without more info, though
Here is data from IPconfig /All
Windows IP Configuration
Host Name . . . . . . . . . . . . : XXXX
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek Gaming GbE Family Controller
Physical Address. . . . . . . . . : 80-E8-2C-D5-1E-E9
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IPv4 Address. . : 169.254.254.92(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 24.116.0.53
24.116.2.50
NetBIOS over Tcpip. . . . . . . . : Enabled