Symantecâ¢ Security Gateways Reference Guide - Sawmill

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94 Understanding VPN tunnelsIPsec standardAlthough AH guarantees that the data has not changed, it does not hide or encrypt the data. Additionally,the AH header is calculated based on all packet information. The IP header, protocol header and protocoldata are all sampled, and the ICV is built from this information. Because AH uses this method, it can only beused when connections do not use network address translation (NAT). Regardless of the transportationmode used, with NAT, the IP header would have one of its addresses changed. When the packet reaches itsdestination, the computed ICV does not match the original ICV, and the packet is discarded.Figure 7-6 shows packets using the AH protection mechanism in both transport and tunnel modes, andwhat portion of the packet is protected.Figure 7-6AH-protected IP datagram in transport and tunnel modesEncapsulating security payload (ESP)ESP provides confidentiality, data integrity, data source authentication, and replay protection to most ofthe IP datagram by inserting an ESP header after the IP header and any IP options, and appending an ESPtrailer. The IP datagram payload is an upper-layer protocol with its respective data, or another entire IPdatagram. The ESP header is not encrypted but a portion of the ESP trailer is. Enough of the ESP trailer (theauthentication portion) is in clear text to allow the decrypting system to process the packet.Note: ESP is the most commonly used data integrity method.
Understanding VPN tunnelsIPsec standard95Figure 7-7 shows an expanded view of the ESP header, and Figure 7-8 shows an expanded view of the ESPtrailer.Figure 7-7ESP-protected IP datagram with expanded ESP headerFigure 7-8ESP-protected IP datagram with expanded ESP trailer
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Symantec Security GatewaysReference
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Licensing and registrationContactin
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6 ContentsMail server record ......
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8 ContentsChapter 9Chapter 10Append
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10 Contents
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12 Introducing Symantec security ga
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14 Introducing Symantec security ga
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16 Network security overviewSecurit
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24 Network security overviewManagem
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32 Security gateway fundamentalsRou
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38 Security gateway fundamentalsDom
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Page 44 and 45: 44 Understanding accessNetwork prot
Page 46 and 47: 46 Understanding accessNetwork prot
Page 48 and 49: 48 Understanding accessProxiesProxi
Page 50 and 51: 50 Understanding accessProxiesExamp
Page 52 and 53: 52 Understanding accessProxiesThe D
Page 54 and 55: 54 Understanding accessProxiesThe H
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Page 58 and 59: 58 Understanding accessProxiesThe S
Page 60 and 61: 60 Understanding accessProxiesTable
Page 62 and 63: 62 Understanding accessService grou
Page 64 and 65: 64 Understanding accessRulesTable 4
Page 66 and 67: 66 Understanding accessRulesWhen a
Page 68 and 69: 68 Controlling service accessFilter
Page 70 and 71: 70 Controlling service accessFilter
Page 72 and 73: 72 Controlling service accessConten
Page 78 and 79: 78 Controlling user accessAuthentic
Page 86 and 87: 86 Controlling user accessTime Peri
Page 88 and 89: 88 Understanding VPN tunnelsTunnels
Page 90 and 91: 90 Understanding VPN tunnelsTunnels
Page 92 and 93: 92 Understanding VPN tunnelsIPsec s
Page 100 and 101: 100 Understanding VPN tunnelsGlobal
Page 102 and 103: 102 Monitoring security gateway tra
Page 114 and 115: 114 Preventing attacksAntivirus (ap
Page 116 and 117: 116 Preventing attacksIntrusion det
Page 118 and 119: 118 Preventing attacksLogical netwo
Page 120 and 121: 120 Preventing attacksAddress trans
Page 126 and 127: 126 Preventing attacksAnti-spam mea
Page 128 and 129: 128 Ensuring availabilitySymantec
Page 130 and 131: 130 Ensuring availabilityStateful f
Page 132 and 133: 132 Ensuring availabilityCluster ad
Page 134 and 135: 134 Log messagesInformational messa
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144 Log messagesInformational messa
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158 Log messagesNotice messages (20
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260 Log messagesCritical messages (
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270 Log messagesEmergency messages
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272 Log messagesEmergency messages
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274 IDS eventsAbout IDS/IPS events
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296 IDS eventsDenial-of-ServiceTabl
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302 IDS eventsIntrusion attemptsUnk
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306 IDS eventsIntrusion attemptsDNS
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312 IDS eventsIntrusion attemptsFTP
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314 IDS eventsIntrusion attemptsHTT
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320 IDS eventsIntrusion attemptsIMA
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322 IDS eventsIntrusion attemptsIRC
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352 IDS eventsIntrusion attemptsWAR
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354 IDS eventsProbesSensor Record F
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356 IDS eventsProbesAffected:No spe
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358 IDS eventsSignaturesSMTP Probin
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360 IDS eventsSignaturesHTTP IIS IS
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362 IDS eventsSignaturesAffected: A
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364 IDS eventsSuspicious activitySu
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366 IDS eventsSuspicious activityBG
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368 IDS eventsSuspicious activityBG
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370 IDS eventsSuspicious activityDN
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508 IDS eventsSuspicious activity
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510 IndexIP address spoofing 21Man-
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512 IndexHH.323alias report 105prox
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514 IndexRTSP 57service parameters
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516 Index
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