please see screen shot, sometimes my computers get one ipv4 address and I can go online but sometimes I get TWO of them and unable to go online?? ipv4.png
One of the addresses is the APIPA address (Automatic Private IP Address) that the computer gives itself when it can't reach a DHCP server or have a static address.
What does IPCONFIG show when you run that in a command prompt?
You can always disable the APIPA address, but you would then have to specify an alternative. Has someone manually configured an APIPA address in the Alternate Configuration tab?
How to Set up Multiple IP Addresses on a Computer