- Configuring multi-WAN load balancing (an excerpt from the pfSense 2 Cookbook): https://www.packtpub.com/mapt/book/networking_and_servers/9781849514866/6/ch06lvl1sec49/configuring-multi-wan-load-balancing
- Using Multiple IPv4 WAN Connections (part of Netgate's pfSense documentation): https://www.netgate.com/docs/pfsense/routing/multi-wan.html