This paper discusses the benefits of performing egress filtering on each of your border routers. As we will see, egress filtering is not only beneficial to your own network, but to the rest of the Internet as well. This is because egress filtering makes your network far less appealing to attackers who are trolling for potential relay sites. What is Egress Filtering? To discuss egress filtering, let's start by mapping the flow of traffic for a typical site which is connected to the Internet. This is shown in Figure 1. Note that we have an internal network as well as a service network which are protected by a firewall. All outbound connection attempts pass through the firewall and the border router on their way to the Internet.
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