Understand traffic mirror filter concepts

A traffic mirror filter is a set of inbound and outbound rules that determines which traffic is copied from the traffic mirror source and sent to the traffic mirror target. You can also choose to mirror certain network services traffic, including Amazon DNS. When you add network services traffic, all traffic (inbound and outbound) related to that network service is mirrored.

We evaluate traffic mirror filter rules from the lowest value to the highest value. The first rule that matches the traffic determines whether the traffic is mirrored. If you don't add any rules, then no traffic is mirrored.

For example, in the following set of filter rules, rule 10 ensures that SSH traffic from my network to my VPC is not mirrored and rule 20 mirrors all other IPv4 TCP traffic.

In the following set of filter rules, rule 10 mirrors HTTPS traffic from all IPv4 addresses and rule 20 mirrors HTTPS traffic from all IPv6 addresses.

Note that if you don't add outbound rules, then no outbound traffic is mirrored.