Symantecâ¢ Security Gateways Reference Guide - Sawmill

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42 <strong>Security</strong> gateway fundamentalsDomain Name Service (DNS)
Chapter 4Understanding accessThis chapter includes the following topics:■■■■Network protocolsProxiesService groupsRulesNetwork protocolsProtocols with a proxyA protocol is a formal set of rules used when two parties wish to communicate or exchange information.Similarly, a network protocol is a set of communication rules agreed upon by endpoints (computers) for thepurpose of transacting a data exchange. Without protocols, it is significantly harder, if not impossible, fordifferent computers to communicate with one another.The security gateway predefines the most commonly used protocols, including their respective ports andthe expected packet type (TCP, UDP, IP, or ICMP). These predefined protocols are used singly or incombination in a rule, but you cannot change or delete them. You can define additional custom protocolswhich may be necessary for custom applications.These protocols represent services commonly used in an IP network. Each standard protocol is predefinedin the security gateway software, and has an individual application-specific proxy associated with it.Examples include DNS, FTP, HTTP, and Telnet. Table 4-1 shows a complete list of supplied protocols andtheir associated application proxy.Table 4-1Supplied protocols with their associated application proxyProtocol name Type Port Associated proxycifs TCP/UDP-based 139 CIFSdns_tcp TCP/UDP-based 53 DNSdns_udp TCP/UDP-based 53 DNSdns_udp_s2s TCP/UDP-based 53 DNSexec TCP/UDP-based 512 RCMDftp TCP/UDP-based 21 FTPh323 TCP/UDP-based 1720 (UDP 20000 - 30000) H323http TCP/UDP-based 80 HTTPICMP IP-based --- Ping
Page 1 and 2: Symantec Security GatewaysReference
Page 3: Licensing and registrationContactin
Page 6 and 7: 6 ContentsMail server record ......
Page 8 and 9: 8 ContentsChapter 9Chapter 10Append
Page 10 and 11: 10 Contents
Page 12 and 13: 12 Introducing Symantec security ga
Page 14 and 15: 14 Introducing Symantec security ga
Page 16 and 17: 16 Network security overviewSecurit
Page 24 and 25: 24 Network security overviewManagem
Page 32 and 33: 32 Security gateway fundamentalsRou
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Page 40 and 41: 40 Security gateway fundamentalsDom
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
Page 56 and 57: 56 Understanding accessProxiesThe N
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
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92 Understanding VPN tunnelsIPsec s
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100 Understanding VPN tunnelsGlobal
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102 Monitoring security gateway tra
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114 Preventing attacksAntivirus (ap
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116 Preventing attacksIntrusion det
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118 Preventing attacksLogical netwo
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120 Preventing attacksAddress trans
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126 Preventing attacksAnti-spam mea
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128 Ensuring availabilitySymantec
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130 Ensuring availabilityStateful f
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132 Ensuring availabilityCluster ad
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134 Log messagesInformational messa
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158 Log messagesNotice messages (20
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176 Log messagesWarning messages (3
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230 Log messagesError messages (400
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256 Log messagesAlert messages (500
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258 Log messagesAlert messages (500
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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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298 IDS eventsDenial-of-ServiceResp
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300 IDS eventsDenial-of-ServiceMalf
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302 IDS eventsIntrusion attemptsUnk
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304 IDS eventsIntrusion attemptsCod
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306 IDS eventsIntrusion attemptsDNS
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308 IDS eventsIntrusion attemptsAff
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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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324 IDS eventsIntrusion attemptsIRC
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328 IDS eventsIntrusion attemptsNim
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330 IDS eventsIntrusion attemptsNim
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332 IDS eventsIntrusion attemptsOSP
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334 IDS eventsIntrusion attemptsRlo
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342 IDS eventsIntrusion attemptsSta
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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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372 IDS eventsSuspicious activityFT
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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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Symantecâ¢ Security Gateways Reference Guide - Sawmill