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FortiOS™Handbook-BestPractices
VERSION5.2.0
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FORTINETDOCUMENT LIBRARY
http://docs.fortinet.com
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http://www.fortiguard.com
END USERLICENSEAGREEMENT
http://www.fortinet.com/doc/legal/EULA.pdf
FEEDBACK
Email:techdocs@fortinet.com
March-05-15
FortiOS™Handbook-BestPractices
01-520-112805-20140806
VB.NET PDF Page Insert Library: insert pages into PDF file in vb.
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VB.NET PDF Library SDK to view, edit, convert, process PDF file
Able to render and convert PDF document to/from supported document and image forms. Capable of adding PDF file navigation features to your VB.NET program.
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TABLE OF CONTENTS
Overview
6
GeneralConsiderations
6
Customerserviceandtechnicalsupport
6
FortinetKnowledgeBase
6
CommentsonFortinettechnicaldocumentation
7
Systemandperformance
8
Performance
8
Shuttingdown
8
Migration
9
Informationgathering
9
Objectandpolicymigration
9
Testingandvalidation
9
Goingliveandobtainingfeedback
10
Addingnewservices
10
Environmentalspecifications
11
Grounding
11
Rackmounting
12
Firmware
13
Firmwarechangemanagement
13
Understandingthenewversionfirst
13
Haveavalidreasontoupgrade
13
Prepareanupgradeplan
14
Executetheupgradeplan
15
Learnmoreaboutchangemanagement
15
Performingafirmwareupgrade
16
Performingafirmwaredowngrade
17
Performingaconfigurationbackup
17
BackingupaconfigurationfileusingSCP
18
SecurityProfiles(AV,WebFilteringetc.)
20
Firewall
20
Security
20
Authentication
21
Antivirus
21
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VB.NET PDF File & Page Process Library SDK for vb.net, ASP.NET
on creating, loading, merge and splitting PDF pages and Files, adding a page blank pages or image-only pages from an image source PDF File Creation and Loading.
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Antispam
21
IntrusionPrevention System(IPS)
21
BlockingSkypeusingCLI optionsforimproveddetection
22
Emailfilter
23
URLfiltering
23
Flow-basedversusproxy-based
23
Localcategory/ratingfeature
23
URLfilter‘Exempt’action
23
DeepScan
23
Webfiltering
24
Patchmanagement
24
Policyconfiguration
25
Policyconfigurationchanges
25
Policywhitelisting
25
IPSandDoS policies
25
Networking
27
Routingconfiguration
27
Policyrouting
27
Dynamicrouting
27
Advancedrouting
27
BorderGatewayProtocol(BGP)
27
OpenShortestPathFirst(OSPF)
27
NetworkAddressTranslation(NAT)
28
ConfiguringNAT
28
TransparentMode
28
ToprotectagainstLayer2loops:
28
UsingVirtualIPs(VIPs)
28
FGCPHighAvailability
29
Heartbeatinterfaces
29
Interfacemonitoring(portmonitoring)
30
WANOptimization
31
SharingtheWANOpt.tunnelfortrafficofthesamenature
31
OrderingWANOpt.rulesappropriately
31
AvoidingmixingprotocolsinaWANOpt.tunnel
31
SettingcorrectconfigurationoptionsforCIFSWANOpt.
31
SettingcorrectconfigurationoptionsforMAPIWANOpt.
31
TestingWANOpt.inalab
31
Regardingbytecompressionandtypeoffile
32
Regardingnetworkaddresstranslation(NAT)
32
HighAvailability
32
Authenticationwithspecificpeers
32
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VirtualDomains(VDOMs)
33
Per-VDOMresourcesettings
33
VirtualdomainsinNAT/Routemode
33
Virtualclustering
33
Explicitproxy
34
Wireless
35
Encryptionandauthentication
35
Geographiclocation
35
Networkplanning
35
LoweringthepowerleveltoreduceRFinterference
36
Option#1:Reducingtransmitpower
36
Option#2:EnsuringthatVAPsaredistributedovertheavailablechannels
36
Wirelessclientloadbalancing
36
Localbridging
37
AdvertisingSSIDs
37
UsingstaticIPsinaCAPWAP configuration
38
Loggingandreporting
39
Logmanagement
39
Systemmemoryandharddisks
40
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VB.NET TIFF: Add New Image to TIFF File in Visual Basic .NET
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Overview
ThisFortiGateBestPracticesdocumentisacollectionofguidelinestoensurethemostsecureandreliable
operationofFortiGateunitsinacustomerenvironment.Itisupdatedperiodicallyasnewissuesareidentified.
GeneralConsiderations
1. Forsecuritypurposes,NATmodeispreferredbecausealloftheinternalorDMZnetworkscanhavesecureprivate
addresses.NATmodepoliciesusenetworkaddresstranslationtohidetheaddressesinamoresecurezonefrom
usersinalesssecurezone.
2. Usevirtualdomains(VDOMs)togrouprelatedinterfacesorVLANsubinterfaces.UsingVDOMswillpartition
networksandcreateaddedsecuritybylimitingthescopeofthreats.
3. UseTransparentmodewhenanetworkiscomplexanddoesnotallowforchangesintheIPaddressingscheme.
Customerserviceandtechnicalsupport
Forantivirusandattackdefinitionupdates,firmwareupdates,updatedproductdocumentation,technicalsupport
information,andotherresources,pleasevisittheFortinetTechnicalSupportwebsiteat
http://support.fortinet.com.
YoucanalsoregisterFortinetproductsandservicecontractsfromhttp://support.fortinet.comandchangeyour
registrationinformationatanytime.
Forinformationaboutourprioritysupporthotline(livesupport),seehttp://support.fortinet.com.
Whenrequestingtechnicalsupport,pleaseprovidethefollowinginformation:
l
Yourname,andyourcompany’snameandlocation
l
Youremailaddressand/ortelephonenumber
l
Yoursupportcontractnumber(ifapplicable)
l
Theproductnameandmodelnumber
l
Theproductserialnumber(ifapplicable)
l
Thesoftwareorfirmwareversionnumber
l
Adetaileddescriptionoftheproblem
FortinetKnowledgeBase
ThemostrecentFortinettechnicaldocumentationisavailablefromtheFortinetKnowledgeBase.Theknowledge
basecontainsshorthow-toarticles,FAQs,technicalnotes,productandfeatureguides,andmuchmore.Visitthe
FortinetKnowledgeBaseathttp://kb.fortinet.com.
6
BestPracticesforFortiOS5.2
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Overview
CommentsonFortinettechnicaldocumentation
Pleasesendinformationaboutanyerrorsoromissionsinthisdocument,oranyFortinettechnicaldocumentation,
totechdoc@fortinet.com.
7
BestPracticesforFortiOS5.2
Systemandperformance
Byimplementingthefollowingbestpracticesforsystemandperformance,youwillensuremaximumefficiencyof
yourFortiGatedevice.Besuretoreadeverythingcarefully,particularlythesectionthatconcernsshuttingdown
theFortiGatesystem,inordertoavoidpotentialhardwareissues.
Performance
l
Disableanymanagementfeaturesyoudonotneed.Ifyoudon’tneedSSHorSNMP,disablethem.SSHalso
providesanotherpossibilityforwould-behackerstoinfiltrateyourFortiGateunit.
l
Putthemostusedfirewallrulestothetopoftheinterfacelist.
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Logonlynecessarytraffic.Thewritingoflogs,especiallyiftoaninternalharddisk,slowsdownperformance.
l
Enableonlytherequiredapplicationinspections.
l
Keepalertsystemstoaminimum.Ifyousendlogstoasyslogserver,youmaynotneedSNMPoremailalerts,
makingforredundantprocessing.
l
EstablishscheduledFortiGuardupdatesatareasonablerate.Dailyupdatesoccurringevery4-5hoursaresufficient
formostsituations.Inmoreheavy-trafficsituations,scheduleupdatesfortheeveningwhenmorebandwidthcanbe
available.
l
Keepsecurityprofilestoaminimum.Ifyoudonotneedaprofileonafirewallrule,donotincludeit.
l
KeepVDOMstoaminimum.Onlow-endFortiGateunits,avoidusingthemifpossible.
l
Avoidtrafficshapingifyouneedmaximumperformance.Trafficshaping,bydefinition,slowsdowntraffic.
Shuttingdown
AlwaysshutdowntheFortiGateoperatingsystemproperlybeforeturningoffthepowerswitchtoavoidpotentially
catastrophichardwareproblems.
TopowerofftheFortiGateunit-web-basedmanager:
1. GotoSystem>Status.
2. IntheSystemResourceswidget,selectShutdown.
TopowerofftheFortiGateunit–CLI:
execute shutdown
Oncethishasbeendone,youcansafelyturnoffthepowerswitchordisconnectthepowercablesfromthepower
supply.
8
BestPracticesforFortiOS5.2
Migration
Networkadministratorsareoftenreluctanttochangefirewallvendorsduetotheperceptionthatthemigration
processisdifficult.Indeed,thereisnopointhidingthefactthatmovingtoanewvendorrequirescareful
consideration.Butconcernoverthepotentialpainofmigrationshouldnotstandinthewayofadoptingnew
securitytechnologies.Thepurposeofthischapteristodescribethebestpracticesforperformingsuchmigrations
andultimatelytoeasethemigrationprocessitself.
Informationgathering
Itisalwaysbestpracticetoperformafullnetworkauditpriortoanymigration.Thisshouldinclude:
l
Fullbackupofallsecuritysystems(includingswitches,routers)incaseaback-outneedstobeperformed.
l
Physicalandlogicalnetworkdiagramwithvisualaudit
Understandingexactlywherecablesruninthenetworkandverifyingtheyareallcorrectlylabeledisessentialto
avoidmistakesandunnecessarydowntimeduringtheupgrade.Don’toverlooksimplethingssuchas:
l
DoIhaveenoughspareinterfacesonmyswitches?
l
DoIhavetherightfiber(single/multimode)andrightconnectors(LC,FC,MTRJ,SC,ST)?
l
DoIhavesparecables?(intheheatofthemoment,itissimplemistaketobreakanRJ-45connectorordamagea
fiber)
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DoIhavespaceintherackforthenewequipment?
l
DoIhaveenoughpowersockets?
NomatterhowsecurelyaFortiGateisconfiguredinthenetwork,itcannothelpifithasbeenbypassed;visually
checkingwherethedevicesitsinthenetworkinrelationtootherdeviceswillensureyouaremaintainingsecurity
andverifythenetworkdiagramis‘asbuilt’.Detailsofallnetworksincludingsubnetmasksshouldbedocumented
atthispointtoensurethatthereplacementdeviceisconfiguredwiththecorrectinformation.
Objectandpolicymigration
Whilstwehavesuggestedsomelevelofmanualreviewisincludedinthepolicymigration,itcanbeusefultobe
abletoautomaticallymigratesimplybetweenanothervendor’sformatandtheFortiGateformat.TheFortiGate
policyformatistextbasedandcaneasilybecutandpastedintofromothervendorformatshowever,responding
tothehighcustomerdemandtomigrateawayfromothervendors,Fortinethavereleasedanautomatic
configurationmigrationtoolathttp://convert.fortinet.comtosimplifythisprocess.SupportingCiscoACLs,PIX,
ASA,CheckPoint,andJuniper,theConvertercansecurelyuploadandconvertthepolicyintotheFortinetformat.
Testingandvalidation
Thisisanimportantprocessandshouldbetestedofflinefirstwhereverpossiblei.e.configurethepolicyinthelab
oronatestnetworkandverifythattherequiredaccesspermissionsarebeingimplemented.Toreallytestthe
9
BestPracticesforFortiOS5.2
Migration
solutionout,theFortiGatecanbeimplementedonthelivenetworkwithadifferentgatewayIPandtheselected
userpointedtothenewgateway.Thisallowsastagedapproachtomigratingthenewplatformintothenetwork
ensuringthattheprocessdoesnotinterruptdaytodayoperations.
Goingliveandobtainingfeedback
Iftestingandvalidationissuccessfulatthispoint,youcanmigratetothenewfirewalleitherbyswitchingIP'sand
removingtheolddevicesorbychangingthedefaultgatewayinDHCP.Oncethefirewallisinplace,acceptance
testingwillofcourseneedtobecarriedoutandaniterativeprocessoftuningundertakentofinalizethe
configuration.
Addingnewservices
TheFortinetsolutionwillhaveaplethoraofadditionalfeaturescomparedtoyourpreviousvendoranditisvery
temptingtostartswitchingthemonbutitisagoodideatowaitandvalidatethenewfirewallaswaspreviously
configuredbeforeaddingnewfunctionsasthissimplifiestestingandproblemdiagnosis.Finallycompletethe
migration(don’tforgetaboutthePlanDoCheckActCycle)byaddinganynewservicesthatwererequestedand
learnaboutthemultiplefeaturesyouhaveavailablewiththeFortiGateappliance.
10
BestPracticesforFortiOS5.2
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