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i9pp0
Asked: 2020-10-01 08:15:55 +0800 CST

No internet upon ip change for server 20.04

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I re-organized my router setup and everything got a new ip (I am discussing internal ip's here). So, I changed the server's static ip in netplan/50-cloud-init.yaml.

network:
  version: 2
  ethernets:
    eno1:
      dhcp4: no

  bridges:
    br0:
      interfaces: [eno1]
      dhcp4: no
      addresses: [192.168.2.50/24]
      gateway4: 192.168.1.1
      nameservers:
        addresses: [192.168.1.1]

This is where I may have made a mistake, I then kept changing things trying to make it work and forgot how it was when I started and it was working with the other ip. Its strange because all I did was change the previous ip to the new ip originally. Internet did not work after that.

I have KVM installed on this server with another 2 virtual machines. I am hoping someone can help me fix up my netplan file and get things working again.

networking server kvm

1 Answers

  1. Best Answer

    In most cases, the gateway should be on the same sub-net as the IP address of the server. Otherwise, data packets can not go through and there will be no connectivity.

    Looking at the IP 192.168.2.50/24 and the gateway 192.168.1.1 in your configuration. They are not on the same sub-net.

    I would suggest finding out the correct addresses for both your gateway and nameserver ( most likely the IP of your router) and changing them accordingly in your server's netplan file.

    I guess the new address for your router is 192.168.2.1. If that is correct then you need to changing both the gateway and the nameserver addresses to 192.168.2.1.

    • 2