Multi-WAN gateway groups are not difficult to add and configure, but you may nevertheless have to troubleshoot such a setup. If you do, there are several problems you are likely to encounter:

• You may encounter a connectivity issue with your primary or secondary connection
• You may encounter a misconfiguration in your setup
• You may encounter a situtation where pfSense thinks a gateway is up when it is actually down, or vice-versa

The first point seems fairly obvious—that connectivity issues may cause problems with multi-WAN setups—but you will want to make sure that both (or all, if you have more than two connections) connections are working, independent of the gateway group. If the secondary connection represents a low percentage of our overall bandwidth, or if it is part of a failure group and therefore is inactive as long as the primary connection...