MacOS – Connected to wifi successfully, but no internet connection

macosNetworkwifi

I'm a relatively new macOS user. Let me try to describe the problem I'm facing as succinctly as possible

Just this morning, when I'm unable to get any internet connection even though WiFi is connected (full strength). All my other devices has no issues when connected to the same network (it's my home network)

I've logged into the router, and checked, there are no blacklisted IP/MAC addresses.

Additional information

I'm using a tMBP 15" for over a year
I've had no issues with any WiFi connectivity to my home network before today.
ping from terminal doesn't work as well.
I'm able to connect to my phone's hotspot, and get internet from my MBP.
I have bootcamp set up. When I boot into Windows, I'm able to get internet access through my home WiFi

How can I troubleshoot this to get to the root cause of the problem?

Best Answer

You've provided great troubleshooting info, we can isolate the problem to being your Mac and not your router, we can isolate the problem to OSX and not your WiFi card, etc.

I want to say it's an IP address problem. Maybe Windows has taken the IP address that your router gave your Mac's MAC address. I'd recommend going to system preferences --> Network. On the left column does WiFi say "connected" or "self-assigned IP" or something else? In the mean time, I'd recommend going to system preferences --> Network--> select WiFi on the left column --> click advanced on the bottom right --> TCP/IP tab --> Renew DHCP lease.

If this doesn't work, you can try on the WiFi tab (instead of TCP/IP), select your WiFi network and then click the minus (-) button to remove it, click OK, and try to reconnect to the WiFi network again.

If that doesn't work, you can hold option and click on the WiFi symbol on your menu bar (top right). Does your IP address look right? If you're not familiar with networking let me know what your IP address and router address are and we can go from there.

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Why does the wifi internet access fail shortly after connecting to a LAN without internet access

You can adjust the order of your network interfaces in the Network panel of System Preferences. This allows you to set the primary adaptor for your network location, which in your case should be the Wi-Fi adaptor, since that provides the actual correct default route to the Internet.

The re-ordering UI is accessible by clicking on the 'gear' icon below the list of Network Adaptors on the left side of the Network Panel, and choosing "Set Service Order...".

You'll probably want to make & use a new Network Location for this setup, because in general (where either Ethernet or Wi-Fi provide valid default routes to the Internet), the Ethernet will be the better preference.

The same re-ordering can be useful for slightly unusual network setups, or VPNs where you may actually want all traffic to go through the VPN route (ie it should be the first service in the list) or maybe you only want the local subnet traffic on the VPN (ie your standard ethernet/wi-fi connections should precede it).

MacOS – Wifi connection but no internet

Your wireless device appears to be in promiscuous mode. Maybe you are doing a packet dump or sniffing packets? If so, no worries. If not, I would investigate this further, as it sometimes yet not always indicates a compromised system being used as a stepping stone in further network penetration.

First, a quick and dirty network device refresh can be effectuated by creating a new location in the System Preferences, under the network portion. Look at the top, and under location, click edit locations. Then click the plus button, and give the new location a name.
Then please select your home network, and re-enter the password.

Your problem might have been resolved. If not, then please go back to the terminal and provide the output of these:

     ifconfig -a -v

     pfctl -v -si

     pfctl -v -sr

     ipconfig getpacket en1

     netstat -nvia -I en1

     netstat -nr

Hope that this helps.

Best Answer

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