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here’s the situation.  i created an aws security group inbound rule to allow ping, which allows me to ping an ec2 instance from my home computer. the issue is that when i remove the ping inbound rule, ping requests are still receiving a response.  i expect that when i remove in this post, i will reproduce the issue and show you that this is a feature of aws security groups and not a bug. there are no inbound rules for security group wbc-web.  no traffic will be permitted even though this ec2 instance has a public ip, no inbound traffic should reach this instance since this instance is as*ociated the from my home computer, if i ping the ec2 instance, i will receive a “request time out.” message there is no response since the security group has no inbound rules. in aws console, i added the inbound rule to security group wbc-web to allow ping from all ip addresses. now if i try to ping the ec2 instance, i will receive a response. if i remove the security group inbound ping rule, i continue to receive a response, which i do not expect. i expect the ping should to demonstrate this, i will run ping with the -t option. this will keep ping running until i cancel it manually. in the image below, the red line marks the point when i removed the ping inbound rule.  after i remove the ping inbound rule, a response i stopped the ping and started the ping to see if i would still receive a response, which i did receive a response. i stop the ping again and waited a minute before starting it again. this time the ping finally timed out. for security groups there is a feature called connection tracking.  connection tracking is used to track information to and from an when there’s a flow of traffic, for our example a ping, and the security group inbound rule is removed, the flow of traffic will not be stopped by the removal of the inbound rule.  the traffic is interrupted when it’s stopped on the client or the host for at removing the ping inbound rule while traffic is flowing will not interrupt or stop the flow of traffic. you must first stop the ping on