What Firewall Rules?
As I prepare to do an audit of my own firewall rules, I'd like to remind everyone that this is a must-do annual exercise for your networks. When I do this, I start with some basic questions:
What ingress filters am I using?
What egress filters am I using?
Do these match my policies?
Then I dig deeper to see what is really going on under that hood (or case). To make sure that we are all on the same page, I offer simple definitions for ingress and egress filters. Ingress is what is incoming from the Internet to your network; egress is what is coming from your network outbound to the Internet. Naturally, if you have a more complex network with extranets this is a little trickier, but I will focus on the Internet connections for now.
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