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Environmentalspecifications
KeepthefollowingenvironmentalspecificationsinmindwheninstallingandsettingupyourFortiGateunit.
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Operatingtemperature:32to104°F(0to40°C).Temperaturesmayvary,dependingontheFortiGatemodel.
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IfyouinstalltheFortiGateunitinaclosedormulti-unitrackassembly,theoperatingambienttemperatureofthe
rackenvironmentmaybegreaterthanroomambienttemperature.
Therefore,makesuretoinstalltheequipmentinanenvironmentcompatiblewiththemanufacturer'smaximum
ratedambienttemperature.
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Storagetemperature:-13to158°F(-25to70°C).Temperaturesmayvary,dependingontheFortiGatemodel.
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Humidity:5to90%non-condensing.
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Airflow-Forrackinstallation,makesurethattheamountofairflowrequiredforsafeoperationoftheequipmentis
notcompromised.
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Forfree-standinginstallation,makesurethattheappliancehasatleast1.5in.(3.75cm)ofclearanceoneachside
toallowforadequateairflowandcooling.
Dependingonyourdevice,theFortiGatemaygenerate,use,andevenradiateradiofrequencyenergyand,ifnot
installedandusedinaccordancewiththeinstructions,maycauseharmfulinterferencetoradiocommunications.
However,thereisnoguaranteethatinterferencewillnotoccurinaparticularinstallation.Iftheequipmentdoes
causeharmfulinterferencetoradioortelevisionreception,whichcanbedeterminedbyturningtheequipmentoff
andon,theuserisencouragedtotrytocorrecttheinterferencebyoneormoreofthefollowingmeasures:
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Reorientorrelocatethereceivingantenna.
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Increasetheseparationbetweentheequipmentandreceiver.
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Connecttheequipmentintoanoutletonacircuitdifferentfromthattowhichthereceiverisconnected.
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Consultthedealeroranexperiencedradio/TVtechnicianforhelp.
Explosionisaseriousriskifthebatteryisreplacedbyanincorrecttype.Disposeof
usedbatteriesaccordingtotheinstructions.Toreducetheriskoffire,useonlyNo.26
AWGorlargerULListedorCSACertifiedTelecommunicationLineCord.
Grounding
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EnsuretheFortiGateunitisconnectedandproperlygroundedtoalightningandsurgeprotector.WANorLAN
connectionsthatenterthepremisesfromoutsidethebuildingshouldbeconnectedtoanEthernetCAT5(10/100
Mb/s)surgeprotector.
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ShieldedTwistedPair(STP)EthernetcablesshouldbeusedwheneverpossibleratherthanUnshieldedTwisted
Pair(UTP).
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DonotconnectordisconnectcablesduringlightningactivitytoavoiddamagetotheFortiGateunitorpersonal
injury.
11
BestPracticesforFortiOS5.2
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Environmentalspecifications
Rackmounting
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ElevatedOperatingAmbient-Ifinstalledinaclosedormulti-unitrackassembly,theoperatingambient
temperatureoftherackenvironmentmaybegreaterthanroomambient.
Therefore,considerationshouldbegiventoinstallingtheequipmentinanenvironmentcompatiblewiththe
maximumambienttemperature(Tmax)specifiedbythemanufacturer.
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ReducedAirFlow-Installationoftheequipmentinarackshouldbesuchthattheamountofairflowrequiredfor
safeoperationoftheequipmentisnotcompromised.
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MechanicalLoading-Mountingoftheequipmentintherackshouldbesuchthatahazardousconditionisnot
achievedduetounevenmechanicalloading.
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CircuitOverloading-Considerationshouldbegiventotheconnectionoftheequipmenttothesupplycircuitand
theeffectthatoverloadingofthecircuitsmighthaveonovercurrentprotectionandsupplywiring.Appropriate
considerationofequipmentnameplateratingsshouldbeusedwhenaddressingthisconcern.
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ReliableEarthing-Reliableearthingofrack-mountedequipmentshouldbemaintained.
Particularattentionshouldbegiventosupplyconnectionsotherthandirectconnectionstothebranchcircuit(e.g.
useofpowerstrips).
12
BestPracticesforFortiOS5.2
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Firmware
Firmwareupgradinganddowngradingsoundsprettysimple,anyonecandoit,right?Themarkofaprofessional
isnotthattheycandosomethingcorrectly,orevendoitcorrectlyoverandoveragain.Aprofessionalworksin
suchawaythat,ifanythinggoeswrongtheyarepreparedandabletoquicklygetthingsbacktonormal.Firmware
updatescangowrongjustlikeanythingelse.Soarealprofessionaldoesthingsinawaythatminimizestheirrisk
andfollowssomebestpractices,aslistedbelow.
Firmwarechangemanagement
Considerthefollowingfivepointswhenperformingfirmwareupgrades,notonlyinFortiOSbutingeneral.This
appliestoprettymuchanychangeyouhavetodoinaproductionenvironment.
Understandingthenewversionfirst
Beforeattemptinganychangesinproduction,firstmakesureyousetupalaboratorywhereyoucanfreelyplay
withthenewfeatures,andunderstandthemwithenoughtimeandnopressure.ReadtheReleaseNotes,
Manuals,andotherdocumentationlikepresentations,videos,orpodcastsaboutthenewversion.
Youarereadytoexplaintheneedforanupgradeonceyouunderstand:
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Thedifferencesandtheenhancementsbetweenthenewversionandthepreviousversion(s).
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Theimpactoftheupgradeoncustomersandtheusersoftheoperatingplatform.
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Theknownlimitationsthatmightaffectyourenvironment.
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Thepotentialriskswhenperformingtheupgrade.
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Thelicensingchangesthatmayapply.
Neverattempttoupgradetoaversionyoudon'tfullyunderstand(bothonfeaturesand
knownlimitations),andonwhichyouhavenooperationalexperience.
Haveavalidreasontoupgrade
ThereasoncanNOTbe“BecauseIwanttohavethelatestversion”.Thereasonhastobeexplainedintermsof
business,technical,and/oroperationalimprovement.
Affirmativeanswerstothefollowingquestionsarevalidreasonstoupgrade:
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Doesthenewversionhaveafeaturethathelpstoensurecompliance?
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Doesthenewversionhaveanenhancementthatallows40%decrease(40%improvement)onthetimetoperform
acertainoperation?
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Doesthenewfeaturecorrectaknowndefect/bugfoundonapreviousversionthataffectsthecompany
business/operations?
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Willthenewversionallowyourorganizationtodeploynewservicesthatwillhelptogainnewcustomersorincrease
13
BestPracticesforFortiOS5.2
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Firmware
loyaltyofexistingones?
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Isthevendorcuttingsupportfortheversionyourorganizationiscurrentlyusing?
Ifthebestreasontoupgradeis“Becausethenewfeaturesseemtobecool”or“BecauseIwanttohavethelatest
version”,alittlemoreunderstandingandplanningmaybenecessary.
Prepareanupgradeplan
Ifyouchoosetoupgradebecauseyoufoundavalidreasontodoso,makesureyoucreateaplanthatcovers
business,technical,andoperationalaspectsoftheupgrade:
Business:
Properplanningandjustificationforanupgradeshouldbeproportionaltohowcriticalthesystemistothe
business.
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Makesureyoucanclearlyarticulatethebenefitsoftheupgradeinbusinessterms(time,money,andefficiency).
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Understandthebusinessprocessesthatwillbeaffectedbythechange.
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Makesuretheupgrademaintenancewindowisnotclosetoabusiness-criticalprocess(suchasquarterlyormonthly
businessclosure).
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Obtainexecutiveandoperationalapprovalforthemaintenancewindow.Theapprovalmustcomefromtheowners
ofALLthesystems/informationaffectedbytheupgrade,notonlyfromthosethatownthesystembeingupgraded.
Theapprovalmustbedoneinaformal(writtenore-mail)form.
Technicalandoperational:
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Re-readtheReleaseNotesforthetechnologyyouareupgrading.Supportedhardwaremodels,upgradepaths,and
knownlimitationsshouldbeclearlyunderstood.
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Makesureyourupgrademaintenancewindowdoesnotoverlapwithanyothermaintenancewindowonyour
infrastructure.
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Ifyouhaveanypremiumsupportoffer(suchasTAM,PremiumSupport),doacapacityplanningexercisetoensure
thenewfirmware/softwareversiondoesnottakemorehardwareresourcesthanyoucurrentlyhave.
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Createabackup,whetherornotyouhavescheduledbackups.Createanewfreshbackup.
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Obtainofflinecopiesofboththecurrentlyinstalledfirmwareandthenewversion.
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Createalistofsystemswithinter-dependenciestothesystemyouareupgrading.Forexample,ifyouare
upgradingaFortiGate;understandtheimpactonanyFortiAP,FortiAuthenticator,FortiToken,FortiManager,or
FortiAnalyzeryouhaveonyourenvironment.
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Ensureyouhavealistofadjacentdevicestotheupgradingplatformandhaveadministrativeaccesstothem,justin
caseyouneedtodosometroubleshooting.AreyouupgradingFortiWeb?Makesureyoucanadministratively
accesstheWebApplications.AreyouupgradingaFortiGate?Makesureyoucanadministrativelyaccessthe
surroundingswitchesandrouters.
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Haveastep-by-stepplanonhowtoperformandtesttheupgrade.Youwanttomakesureyouthinkoftheworst
situationbeforeithappens,andhavepredefinedcoursesofaction,insteadofthinkingunderpressurewhen
somethingalreadywentwrong.
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Defineasetoftests(thatincludecriticalbusinessapplicationsthatshouldbeworking)tomakesuretheupgrade
wentfine.Ifanytestdoesnotgowell,definewhichonesmandatearollbackandwhichonescanbetoleratedfor
furthertroubleshooting.Thissetoftestsshouldberunbeforeandaftertheupgradetocompareresults,andthey
shouldbethesame.
14
BestPracticesforFortiOS5.2
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Firmware
l
Defineaclearrollbackplan.Ifsomethinggoeswrongwiththeupgradeorthetests,therollbackplanwillhelpyou
getyourenvironmentbacktoaknownandoperationalstatus.Theplanmustclearlystatetheconditionsunder
whichtherollbackwillbestarted.
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Declareconfigurationfreezes.Alittlebitbeforeandaftertheupgrade.Theideaistoreducetheamountof
variablestotakeintoconsiderationifsomethinggoeswrong.
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Performa“QualityAssurance”upgrade.Grabacopyoftheproductionconfiguration,loaditonanon-production
boxandexecutetheupgradetheretoseeifthereareanyissuesontheprocess.Thenadjustyourplanaccordingto
theresultsyouobtained.
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Havealistofinformationelementstobegatheredifsomethinggoeswrong.Thisensuresthat,eveniftheupgrade
fails,youwillcollectenoughinformationsoyoucantroubleshoottheissuewithoutneedingtorepeattheproblem.
GethelpfromTAC/Supportdepartmentsifyouneedtocheckwhatelsecouldbemissingonyourlist.
l
Defineatestmonitoringperiodafterthechangewascompleted.Eveniftheupgradewentsmoothly,something
couldstillgowrong.Makesureyoumonitortheupgradedsystemforatleastonebusinesscycle.Businesscycles
maybeaweek,amonth,oraquarter,dependingonyourorganization’sbusinesspriorities.
Executetheupgradeplan
Executionofanupgradeisjustaskeyasplanning.
Onceyouareperformingtheupgrade,thepressurewillriseandstressmightpeak.Thisiswhyyoushouldstickto
theplanyoucreatedwithacoolhead.
Resistthetemptationtotakedecisionswhileperformingtheupgrade,asyourjudgmentwillbecloudedbythe
stressofthemoment,evenifanewdecisionseemstobe“obvious”atsuchtime.Ifyourplansaysyoushould
rollback,thenexecutetherollbackdespitethepotential“We-can-fix-this-very-quickly”mentality.
Whileperformingtheupgrade,makesurealltheinvolvedcomponentsarepermanentlymonitoredbefore,during,
andaftertheupgrade,eitherviamonitoringsystems,SNMPalerts,oratleastwithtoolslikeaping.Critical
resourceslikeCPU,memory,network,and/ordiskutilizationmustalsoconstantlymonitored.
Toavoidmisunderstandings,whenperformingthetestsforeachcriticalapplicationdefinedontheplanning,
makesurethereareformalnotificationsontheresultsforeachuserarea,service,system,and/orapplication
tested.
Regardlessifyouhavetorollbackornot,ifaproblemoccurs,makesureyougatherasmuchinformationabout
theproblemaspossible,soyoucanlaterplaceasupporttickettofindasolution.
Lastbutnotleast,documenttheupgrade:
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Enableyourterminalemulationprogramtoleavetraceofallthecommandsexecutedandalltheoutputgenerated.
IfyouareperformingstepsviaGUI,considerusingavideocapturetooltodocumentit.
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Documentanycommandorchangeperformedovertheadjacent/interdependentsystems.Makesuretheyare
acknowledgedbytherelevantadministrators
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Documentanydeviationsperformedovertheupgradeplan.Thisisplanned-versus-actual.
Learnmoreaboutchangemanagement
ChangeManagementandChangeControlarehugeknowledgeareasinthefieldofInformationSystemsand
Computer/NetworkSecurity.
Thisdocumentisbynomeansacomprehensivelistonwhatyoushoulddowhenperforminganupgrade,with
eitherFortinetoranyothertechnology.Itismerelyalistofimportantthingsyoushouldtakeintoconsideration
15
BestPracticesforFortiOS5.2
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Firmware
whenperformingupgradeswhicharetheresultofyearsofexperiencedealingwithchangesoncritical
environments,asitiscommonthatsecuritydevicesareprotectingcriticalapplicationsandprocesses.
Therearevastresourcesonthetopic:books,publicwhitepapers,blogentries,etc.IfyousearchtheInternetfor
the“ChangeControlBestPractices”or“ChangeManagementBestPractices”youwillgetmanyinteresting
documents.
ChangesonproductionITinfrastructurearecriticaltothebusiness.Makesurethey
playinyourfavorandnotagainstyou.
Performingafirmwareupgrade
Upgradingafirewallissomethingthatshouldbecomparedtoupgradingtheoperatingsystemonyourcomputer.
It’snottobetakenlightly!Youwanttomakesureeverythingisbackedupandyouhavesomeoptionsavailableif
thingsgoawry.Assumingitallseemstoworkyoualsowantalistofthingstodoinordertoconfirmeverythingis
workingproperly.Finally,youneedenoughtimetodoit.Allreallysimplestuff,butwhatdoesthismeanin
relationtoupgradingyourFortiGate?Itmeans,youfollowthesesimplesteps:
1. Backupandstoreoldconfiguration(fullconfigurationbackupfromCLI).
Diggingintothisalittle,step1iseasytounderstand.Doafullbackupofyouroldconfiguration.Thisisallpartof
yourdisasterrecoveryplan.IftheupgradefailsinsomewayyouneedtomakesureyoucangettheFirewallback
upandrunning.Thebestwaytodothisistogetitbacktoastatewhereyouknowwhatthebehaviorwas.For
moreinformation,referto"Performingaconfigurationbackup"onpage17.
2. Havecopyofoldfirmwareavailable.
Step2,isalsopartofyourdisasterrecovery.Iftheupgradefailsyoumightbeabletoswitchtheactivepartition.
ButasaProfessional,youneedtobepreparedfortheworstcasescenariowhereyoucan’tdothat.Whichmeans
you’llneedyouroldfirmware.
3. Havedisasterrecoveryoptiononstandby--especiallyifremote.
Step3,isyourplanforwhattodointheeventofacriticalfailure.Aswe’retalkingFortiGatethismeansthatyour
firewalldoesn’tcomebackaftertheupgrade.Whatthismeansisthatyouneedtobeabletogettotheconsole
portinordertofindoutwhy.Maybeit’sDHCPandtheIPchanged,maybetheOSiscorrupt,whoknows?Getto
theconsoleandfindout.
Therecouldbeasimplefix.Ifthere’snot,thenbepreparedforaformatandTFTPreload.
4. Readthereleasenotes,includingtheupgradepathandbuginformation.
Step4,READTHERELEASENOTES.Theycontainallkindsofinformation,knownbugs,fixedbugseven
upgradeissueslikelostconfigurationsettings.Notallupgradeinformationisevercontainedinanyproducts
releasenotes.Thatdoesnotmeantheyaredevoidofgood/usefulinformation.Readthem,digestthem,thena
fewdayslaterreadthemagain.
5. Doublecheckeverything.
Step5,doadoublecheckofeverything.IsyourTFTPserverworking,doesyourconsoleconnectionfunction,is
thereanythinginthereleasenotesthatcouldimpactyourupgradeprocedure,doyouhaveyourconfiguration
backedup?Makesureyou’vedoneeverything.
6. Upgrade.
Step6,dotheupgrade.Doinganupgradedoesn’ttakeverylong,afewminutes(lessalotoftimes)butmakesure
youscheduleenoughtimeforit.Attheendofthedayanupgradecansucceedorfail.Ifitsucceedsyouwant
16
BestPracticesforFortiOS5.2
Firmware
sometimetocheck/confirmthatanyimportantfeaturesyouhaveareworking(VPNsetc).Ifitfailsyou’llneedtime
tosortthingsout.
Performingafirmwaredowngrade
Justlikeupgrading,youneedtomakesureit’sdoneproperly.Whilesimilar,thestepsaresomewhatdifferent
sincethereareotherpitfallsinthiscase.
1. Locatepre-upgradeconfigurationfile.
Step1isveryimportant.Thisiswhy,whenyouupgradeyoumakeabackupofyouroldconfigurationandsaveit.
Ifyoudon’t,thenyou’llneedtorebuildmanually.
2. Havecopyofoldfirmwareavailable.
Step2isfairlyobvious.Evenwithdevicesthathavemultiplepartitionsandyourdowngradeprocessissimply
goingtobetoswitchtheactivepartition,thiscouldgowrong.Inwhichcase,youmaybewithoutInternetaccess.
Aprofessionalhasaplanforwhenthingsgowrong.
3. Havedisasterrecoveryoptiononstandby--especiallyifremote.
Step3isnodifferentfrombefore.Hopefullyyoudon’tneedtoformattheunit,butbepreparedforthat,justin
case.
4. Readthereleasenotes--isadowngradepossible,ornecessary?
Step4,onceagain,istoREADTHERELEASENOTES.Inthiscase,youwillneedtodothisfortheversionyou
areon,andtheversionyouaredowngradingtoo,andeverythinginbetween(ifyouaregoingbackmultiplemajor
releasesorpatches).MaybetheOSswitchedfrom32to64bitssomewherebetweenthetwofirmwarereleases.
Inordertomakesureyoudon’tgetnailedbysomethinglikethatyouneedtochecktheupgradeanddowngrade
informationineverymajorreleaseandpatch,asitmayhaveadirectimpactonyouroptions.
5. Doublecheckeverything.
6. Downgrade--allsettings,exceptthoseneededforaccess,arelost.
Step5and6arethesameasbefore.Doublecheckeverything,thendowngrade.
7. Restorepre-upgradeconfiguration.
Step7isnew.Obviouslymostsettingsarelostwhenyoudowngradesoinordertogetbackupandrunningyou
willneedtorestoreyouroldconfigurationfile.
Performingaconfigurationbackup
OnceyouconfiguretheFortiGateunitanditisworkingcorrectly,itisextremelyimportantthatyoubackupthe
configuration.Insomecases,youmayneedtoresettheFortiGateunittofactorydefaultsorperformaTFTP
uploadofthefirmware,whichwillerasetheexistingconfiguration.Intheseinstances,theconfigurationonthe
devicewillhavetoberecreated,unlessabackupcanbeusedtorestoreit.
Itisalsorecommendedthatonceanyfurtherchangesaremadethatyoubackuptheconfigurationimmediately,
toensureyouhavethemostcurrentconfigurationavailable.Also,ensureyoubackuptheconfigurationbefore
upgradingtheFortiGateunit’sfirmware.Shouldanythinghappenduringtheupgradethatchangesthe
configuration,youcaneasilyrestorethesavedconfiguration.
Alwaysbackuptheconfigurationandstoreitonthemanagementcomputeroroff-site.Youhavetheoptionto
savetheconfigurationfiletovariouslocationsincludingthelocalPC,USBkey,FTPandTFTPsite.Thelattertwo
areconfigurablethroughtheCLIonly.
17
BestPracticesforFortiOS5.2
Firmware
IfyouhaveVDOMs,youcanbackuptheconfigurationoftheentireFortiGateunitoronlyaspecificVDOM.Note
thatifyouareusingFortiManagerorFortiCloud,fullbackupsareperformedandtheoptiontobackupindividual
VDOMswillnotappear.
TobackuptheFortiGateconfiguration-web-basedmanager:
1. GotoSystem>Dashboard>Status.
2. OntheSystemInformationwidget,selectBackupnexttoSystemConfiguration.
3. SelecttobackuptoyourLocalPCortoaUSBDisk.
TheUSBDiskoptionwillbegrayedoutifnoUSBdriveisinsertedintheUSBport.Youcanalsobackuptothe
FortiManagerusingtheCLI.
4. IfVDOMsareenabled,selecttobackuptheentireFortiGateconfiguration(FullConfig)oronlyaspecificVDOM
configuration(VDOMConfig).
5. IfbackingupaVDOMconfiguration,selecttheVDOMnamefromthelist.
6. SelectEncryptconfigurationfile.
EncryptionmustbeenabledonthebackupfiletobackupVPNcertificates.
7. Enterapasswordandenteritagaintoconfirmit.Youwillneedthispasswordtorestorethefile.
8. SelectBackup.
9. Thewebbrowserwillpromptyouforalocationtosavetheconfigurationfile.Theconfigurationfilewillhavea
.confextension.
TobackuptheFortiGateconfiguration-CLI:
execute backup config management-station <comment>
…or…
execute backup config usb <backup_filename> [<backup_password>]
…orforFTP(notethatportnumber,usernameareoptionaldependingontheFTPsite)…
execute backup config ftp <backup_filename> <ftp_server> [<port>] [<user_name>]
[<password>]
…orforTFTP…
execute backup config tftp <backup_filename> <tftp_servers> <password>
UsethesamecommandstobackupaVDOMconfigurationbyfirstenteringthecommands:
config vdom
edit <vdom_name>
BackingupaconfigurationfileusingSCP
Youcanusesecurecopyprotocol(SCP)todownloadtheconfigurationfilefromtheFortiGateunitasan
alternativemethodofbackinguptheconfigurationfileoranindividualVDOMconfigurationfile.Thisisdoneby
enablingSCPforandadministratoraccountandenablingSSHonaportusedbytheSCPclientapplicationto
connecttotheFortiGateunit.SCPisenabledusingtheCLIcommands:
config system global
set admin-scp enable
end
18
BestPracticesforFortiOS5.2
Firmware
UsethesamecommandstobackupaVDOMconfigurationbyfirstenteringthecommands:
config global
set admin-scp enable
end
config vdom
edit <vdom_name>
19
BestPracticesforFortiOS5.2
SecurityProfiles(AV,WebFilteringetc.)
Infectioncancomefrommanysourcesandhavemanydifferenteffects.Becauseofthis,thereisnosinglemeans
toeffectivelyprotectyournetwork.Instead,youcanbestprotectyournetworkwiththevariousUTMtoolsyour
FortiGateunitoffers.
Firewall
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Becarefulwhendisablingordeletingfirewallsettings.Changesthatyoumaketothefirewallconfigurationusing
theGUIorCLIaresavedandactivatedimmediately.
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Arrangefirewallpoliciesinthepolicylistfrommorespecifictomoregeneral.Thefirewallsearchesforamatching
policystartingfromthetopofthepolicylistandworkingdown.Forexample,averygeneralpolicymatchesall
connectionattempts.Whenyoucreateexceptionstoageneralpolicy,youmustaddthemtothepolicylistabove
thegeneralpolicy.
l
AvoidusingtheAllselectionforthesourceanddestinationaddresses.Useaddressesoraddressgroups.
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Ifyouremoveallpoliciesfromthefirewall,therearenopolicymatchesandallconnectionsaredropped.
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Ifpossible,avoidportrangesonservicesforsecurityreasons.
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Thesettingsforafirewallpolicyshouldbeasspecificaspossible.Donotuse0.0.0.0asanaddress.DonotuseAny
asaservice.UsesubnetsorspecificIPaddressesforsourceanddestinationaddressesanduseindividualservices
orservicegroups.
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Usea32-bitsubnetmaskwhencreatingasinglehostaddress(forexample,255.255.255.255).
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Useloggingonapolicyonlywhennecessaryandbeawareoftheperformanceimpact.Forexample,youmaywant
tologalldroppedconnectionsbutcanchoosetousethissparinglybysamplingtrafficdataratherthanhaveit
continuallystoringloginformationyoumaynotuse.
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Itispossibletousesecuritypoliciesbasedon'any'interface.However,forbettergranularityandstrictersecurity,
explicitinterfacesarerecommended.
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Usethecommentfieldtoinputmanagementdata,forexample:whorequestedtherule,whoauthorizedit,etc.
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AvoidFQDNaddressesifpossible,unlesstheyareinternal.ItcancauseaperformanceimpactonDNSqueriesand
securityimpactfromDNSspoofing.
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Fornonvlaninterfaces,usezones(evenifyouhaveonlyonesingleinterfaceformembers)toallow:
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Anexplicitnameoftheinterfacetouseinsecuritypolicies('internal'ismoreexplicitthan'port10').
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Asplitbetweenthephysicalportanditsfunctiontoallowportremapping(forinstancemovingfroma1G
interfacetoa10Ginterface)ortofacilitateconfigurationtranslation,asperformedduringhardwareupgrades.
Security
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UseNTPtosynchronizetimeontheFortiGateandthecorenetworksystems,suchasemailservers,webservers,
andloggingservices.
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Enablelogrulestomatchcorporatepolicy.Forexample,logadministrationauthenticationeventsandaccessto
systemsfromuntrustedinterfaces.
20
BestPracticesforFortiOS5.2
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