Question

New droplet cannot ping default gateway

Posted on June 2, 2024
DigitalOcean Droplets Networking
Asked by bryanpkc

I have just created a new droplet from a snapshot of another droplet running Ubuntu 16.04, with the intention to upgrade the new droplet while keeping the old one running. The new droplet started up fine, and I can ssh into it, but outbound connections from the droplet are completely blocked, and I cannot even ping the default gateway, even after disabling ufw. The IP address, gateway address, and the network mask have been confirmed to be correct (i.e. matching the values shown in the control panel). route -n and ip -br a output look correct. What else should I try?

Addendum: Clearly not all outbound packets are dropped, as my SSH connections are working. Also, a HTTP server running on the droplet is able to respond to access requests.

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alexdo

Site Moderator

• June 3, 2024

Heya, bryanpkc

My initial approach will be to ensure that the network configuration files, such as /etc/network/interfaces or Netplan configuration files (if applicable), are correctly set up. For Ubuntu 16.04, the network interfaces file should be checked:

nano /etc/network/interfaces

Make sure the configuration matches what is provided in the control panel.

You can also check the system logs for any relevant error messages:

sudo tail -f /var/log/syslog sudo dmesg | grep -i error

Hope that this helps!

KFSys

Site Moderator

• June 2, 2024

I might be wrong but this could be due to the difference in how Ubuntu handles network from Ubuntu 16 to whatever new version you have now.

Bobby Iliev

Site Moderator

• June 2, 2024

Hey @bryanpkc,

What I could suggest here as a first step is going over the steps listed in this troubleshooting doc:

https://docs.digitalocean.com/support/how-do-i-debug-my-droplets-network-configuration/#check-network-configuration-file

There are troubleshooting steps for Ubuntu 16 as well.

If you are still seeing this issue, I could suggest trying to re-create the Droplet to see if this helps.

Also, both the re-creation and the troubleshooting doc do not help, it might be best to reach out to the DigitalOcean support team and provide them with as much information as possible: