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I used macchanger with these commands:

sudo ifconfig eth0 down
sudo macchanger -r eth0 
sudo ifconfig eth0 up

I am using it with virtualbox on a local network, I've never had issue with that before, however now once I do that I lose internet.

the issue goes away when I reboot the machine as the MAC address reset to default. tried to reboot the router also, and my Linux works perfectly fine until I reset its MAC address.

ifconfig shows no ipv4 for eth0, restarting network-manager does not help. either.

Troubleshooting done without success :

Tried different hardware: computer, router and fresh install of virtualbox and Kali.

Tried to use the older version of virtualbox.

service network-manager restart, macchanger -e -r, dhclient eth0.

Changed /etc/network/interfaces for eth0 with dhcp then for oreth0 static.

Tried different network settings on virtualbox.

Checked the firewall disabled local and gateway.

Reinstalled network-manager.

ping 8.8.8.8 return " this site can't be reached".

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    Hey Benjy - More info would help. Is this on a local network behind a home router, corporate network or directly connected to a DOCSIS cable modem? Regardless have you restarted the next hop in the network?
    – Joe M
    Commented Jan 20, 2019 at 6:56

3 Answers 3

Reset to default
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Try to edit directly on network-manager:
Right click on

Network-Manager -> Edit Connections -> Choose the adapter "wifi or wired" -> ...

...then edit the MAC ADDRESS of the adapter selected.
If it worked, please feedback to us.

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Ideas:

  • If you're fresh install is actually clean from the distro, then it makes me think your wifi password is bad (if on wlan) or you have a wiring/switch/gateway issue.
  • If you're chaining your mac, it makes me think you're on a VM with a virtual switch to your host. Confirm from your host that you have connectivity to the wan. ping 8.8.8.8 or ping 4.2.2.1 to see if you can reach out.
  • Sounds like there may be a layer 2 access control at the gateway/switch. Login if you have creds and confirm that there isn't a mac whitelist in place.
  • Check your local/network firewall. Try disabling the local and/or gateway firewall for a quick second to see if the problem goes away.
  • There could be a packet MTU setting issue, but that is not very likely. Steps to troubleshoot that would be a bit advanced.
  • If you also control the gateway/switch, try resetting them as well. You're clearly willing to blow away your box to fix this, so maybe you'd be willing to reset them as well.
  • Look into which services your flavor of *nix needs for networking. Example: https://theos.in/desktop-linux/tip-that-matters/how-do-i-restart-linux-network-service/. It could be that one of these services was disabled, and needs to be enabled.
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  • Changing the MAC address for purposes of spoofing another user's MAC to bypass certain access controls might be one reason
    – waymobetta
    Commented Jan 20, 2019 at 7:28
  • Hence the assumption on line 4...
    – sadtank
    Commented Jan 20, 2019 at 7:35
  • OP does not have an IP - that makes half of your suggestions unworkable
    – schroeder
    Commented Jan 20, 2019 at 13:56
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It seems you can't address your NIC through eth0 because of the MAC address is 00:00:00:00:00:00 isn't it ? You can't save any configuration for your nic, you can't use it, that's why you have the same problem using a different Linux distribution. It's a hardware problem i'm afraid, not software

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