The results of the test are simple: Gateway failover occurs if the PPPoE gateway goes down (ie., removing the internet cable from the WAN port) or if the WAN interface is disabled. Gateway failover does not occur if the "PPP disconnect" button is pressed using the GUI Interfaces.
In the following tests, failure occurs in test #6: you can explicitly see that the PPPoE interfacte is the default route while the interface is in the "Pending" status,.
Gateways
Name Default Interface Gateway Monitor IP Description Actions
WAN_PPPOE Tier 1 (IPv4) WAN Interface WAN_PPPOE Gateway
WAN_FailOverGW Tier 2 (IPv4) WAN_FAILOVER [St.at.ic.IP] [St.at.ic.IP] Backup ADSL Interface
Test #1: no Ethernet connection in either WAN ports
Gateways
WAN_PPPOE Pending Pending Pending Pending Interface WAN_PPPOE Gateway
WAN_FailOverGW [St.at.ic.IP] [St.at.ic.IP] 0ms 0ms 100% Offline, Packetloss: 100% Backup ADSL Interface
Test #2: Only WAN_FailOverGW is connected to Internet
Gateways
WAN_PPPOE Pending Pending Pending Pending Interface WAN_PPPOE Gateway
WAN_FailOverGW (default) [St.at.ic.IP] [St.at.ic.IP] 0.766ms 1.392ms 0.0% Online Backup ADSL Interface
Test #3: Both gateways connected to Internet
Gateways
WAN_PPPOE (default) [PPP.Se.rv.er] [PPP.Se.rv.er] 3.136ms 1.348ms 0.0% Online Interface WAN_PPPOE Gateway
WAN_FailOverGW [St.at.ic.IP] [St.at.ic.IP] 0.615ms 0.879ms 0.0% Online Backup ADSL Interface
Test #4: Remove WAN_PPPOE Cable
Gateways
WAN_PPPOE (default) [PPP.Se.rv.er] [PPP.Se.rv.er] 3.071ms 2.284ms 13% Warning, Packetloss: 13% Interface WAN_PPPOE Gateway
WAN_FailOverGW [St.at.ic.IP] [St.at.ic.IP] 0.535ms 0.528ms 0.0% Online Backup ADSL Interface
Gateways
WAN_PPPOE [PPP.Se.rv.er] [PPP.Se.rv.er] 2.786ms 0.992ms 55% Offline, Packetloss: 55% Interface WAN_PPPOE Gateway
WAN_FailOverGW (default) [St.at.ic.IP] [St.at.ic.IP] 0.557ms 0.55ms 0.0% Online Backup ADSL Interface
Gateways
WAN_PPPOE [PPP.Se.rv.er] 0ms 0ms 100% Offline, Packetloss: 100% Interface WAN_PPPOE Gateway
WAN_FailOverGW (default) [St.at.ic.IP] [St.at.ic.IP] 0.757ms 1.359ms 0.0% Online Backup ADSL Interface
Test #5: Reconnect WAN_PPPoE
Gateways
WAN_PPPOE (default) [PPP.Se.rv.er] [PPP.Se.rv.er] 2.632ms 0.432ms 0.0% Online Interface WAN_PPPOE Gateway
WAN_FailOverGW [St.at.ic.IP] [St.at.ic.IP] 0.663ms 0.714ms 0.0% Online Backup ADSL Interface
Test #6: Issue disconnect
Gateways
WAN_PPPOE (default) dynamic Pending Pending Pending Pending Interface WAN_PPPOE Gateway
WAN_FailOverGW [St.at.ic.IP] [St.at.ic.IP] 1.006ms 1.911ms 0.0% Online Backup ADSL Interface
Gateways
Name Default Interface Gateway Monitor IP Description Actions
WAN_PPPOE Tier 1 (IPv4) WAN dynamic Interface WAN_PPPOE Gateway
WAN_FailOverGW Tier 2 (IPv4) WAN_FAILOVER [St.at.ic.IP] [St.at.ic.IP] Backup ADSL Interface
Simple workaround: don't touch that button!