pfSense

I have two WAN interfaces and a firewall rule to make the secondary WAN the gateway for some of the hosts. A screenshot of the rule is attached. The alias "ADSL_Out_Hosts" includes the list of hosts who need the alternate gateway.

This rule has worked flawlessly for over two years, but in the past week it has failed twice. In both cases, all hosts on the LAN reverted to the default gateway. I verified this by logging in to a machine that was on the ADSL_Out_Hosts list and through whatismyipaddress.com saw that it's using the wrong gateway.

The first time this happened I rebooted the firewall and the problem went away.

The second time this happened I went into the rule in the screenshot, checked "Disable this rule", applied the changed, then went in there again and removed the disable checkmark. That, too, fixed the problem.

This pretty much proves in my mind that the problem is with pfSense.

If there is any more information I can provide, I'd be happy to do so. For instance, if there is anything in the logs I can watch out for next time this happens or if there is any diagnostics steps I can take to help pin this down, please let me know.

For reference, this rule has been in place for over two years with not a single issue. I have been running the latest release version for a few months but problems just started last week.

I'm running 2.1-RELEASE (i386) built on Wed Sep 11 18:16:50 EDT 2013, FreeBSD 8.3-RELEASE-p11