[AWS] What to do when the ping command causes a "timeout"

Time out with ping command

I want to create an EC2 instance on AWS and check the response with the ping command, but it times out.

スクリーンショット 2020-05-20 8.26.30.png

■ There are two main possible reasons.

  1. The server is down
  2. Blocked by a firewall

This time about 2.

ICMP must be allowed in the security group that corresponds to the firewall.

■ Procedure

  1. Log in to the management console
  2. Select the security group you are using
  3. Click "Edit Inbound Rule"
  4. Select "Custom ICMP-IPv4" and select the source anywhere
  5. Save the rule

スクリーンショット 2020-05-20 8.36.05.png

スクリーンショット 2020-05-20 8.42.41.png

If the cause of not responding with the ping command is the security group setting, the ping command should pass with the above settings.

reference

Building a network & server from the basics of Amazon Web Services

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