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Software User Guide 160
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EnableIPFallback:SelectYEStoenabletheIPFallback.Enablethisoptionifyouhavetwopaths(interfaces)config‐
uredwithWAN(internet)support.Anexamplewouldbeprimaryethernet(eth0)andsecondarywireless(ppp0).
Note:WhenusinganethernetportsetupasDHCPClient,choose:UseRemoteGatewayas
DefaultRoute:NOinthe
ethernetportsetupscreen.DefaultroutecontrolwillbemanagedbytheIPFallbackinstead.
SelectPrimaryInterface:Specifyyourdesiredprimar yinterfaceforIPFallbackbehavior.
SelectPrimaryExternalCommandScript:Choosethenameofthecommandscripttobeexecutedwhentheassoci‐
ated
interfacebecomesactive.Forexample,ifaRestartVPNisanoption,thenwhenselected,itwillberunwhenever
thefallbacklogicselectsandactivatesthisinterface.
TherecommendedsettingforthisfieldisNoneforstandardoperationwithnospecialbehaviors.RestartVPNisuseful
whenusingandIPSECVPNtunnel.
SelectSecondaryInterface:SelectthesecondaryinterfacetobeusedforIPFallback.Selectingvrrpwillcoordinate
withtheVRRPprocess,sothatwhentheprimaryinterfaceisdeterminedtobeunavailable,VRRPwillstopbroadcast‐
ingavailability.
SelectSecondaryExternalCommandScript:Choosethenameofthecommandscriptto
beexecutedwhentheasso‐
ciatedinterfacebecomesactive.Forexample,ifaRestartVPNisanoption,thenwhenselected,itwillrunwhenever
thefallbacklogicselectsandactivatesthisinterface.
TherecommendedsettingforthisfieldisNoneforstandardoperationwithnospecialbehaviors.RestartVPNisuseful
when
usinganIPSECVPNtunnel.
EnterPrimaryTestIPAddress(Required):SpecifytheIPaddressofahostwithwhichtheIPFallbackservicewillcom‐
municatetotestconnectivity.Valuemustbeapingableaddress,andnotadomainname.Thebestchoicewouldbean
addressthatrepresentsend
‐to‐endconnectivity.
EnterRequestInterval(inseconds):Specifythetime,inseconds,towaitbetweenconnectivitytests.Theminimumis
10,maximumis600.Note:Thisvalueshouldbe30orhigherforPPPconnections.
NumberofTestPacketstoSend:Specifythenumberof0bytepingpack et sto
sendouttotestconnectivity.Themini‐
mumis2,maximumis30.Therecommendedsettingforthisfieldis5‐10.
AllowableTestPacketLoss:SpecifythenumberoflostpacketsthatareacceptablebeforetheIPFallbackservicewill
considerthelinkunavailable,andswitchtoitssecondary.Note:
thevaluemustbelessthanthenumberoftestpack ‐
etssetviaTestPacketstoSend.
SelectDebuggingLevel:Specifyadebuglevelforloggingpurpose.Thisisrecommendedonlywhenexistingconfigura‐
tionsdonotfunctionasexpected,andwhendirectedtochangebyRedLionTechnicalSupport.
• Clickonthe“Save”buttonforchangestobesave dwithoutactivatingtheinterfaceuntilyoureboottheunit,the
“Apply ” buttonwillsaveyoursettingsandapplythemimmediately.Toreverttothepreviousdefaults,clickonthe
“Revert”button.