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Jenkins Port Forwarding (8080 -> 80) with pf on Mavericks/Yosemite

This guide is a fork from this gist. I've added minor adjustments to customise these rules to forward connections from an outsite interface like en0.

Since Mavericks stopped using the deprecated ipfw (as of Mountain Lion), we'll be using pf to allow port forwarding.

1. Create the anchor file

Create an anchor file under /etc/pf.anchors/com.jenkins with your redirection rule like: