Web Gateway 7.1.5 Product Guide - McAfee

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3 Proxies and caching Web caching Enable Web Cache Always –> Continue — Enable Web Cache The rule is always processed unless it is skipped because the bypassing rule placed before it in the rule set applies. It enables the web cache, so objects stored in it can be read. Processing continues with the next rule set. Write to Cache This nested rule set enables the writing of web objects to the cache and forbids it for large objects, as well as for URLs and media types on particular bypassing lists. Nested library rule set — Write to Cache Criteria — Always Cycles — Responses The rule set contains the following rules: Skip caching URLs that are in Web Cache URL Bypass List URL matches in list Web Cache URL Bypass List –> Stop Rule Set The rule uses the URL property to check for a URL sent from the web whether it is on the specified bypass list. If it is, processing of the rule set stops. The rule that enables writing to the cache is then not processed. Processing continues with the next rule set. Note: The rule is not enabled by default. Skip caching objects that are larger than X bytes String.ToNumber (Header.ResponseGet (“Content-Length”)) greater than 8388608 –> Stop Rule Set The rule uses the String.ToNumber property to convert a string in a response header that is sent with an object to indicate its content length into a numerical value. Then it checks whether this value is greater than the number specified here. If it is, processing of the rule set stops and the writing rule of the rule set is not processed. Processing continues with the next rule set. Note: The rule is not enabled by default. Skip caching media types that are in Web Cache Media Type Blocklist MediaType.FromHeader is in list Web Cache Media Type Blocklist –> Stop Rule Set The rule uses the MediaType.FromHeader property to check for media whether the type they belong to is on the specified bypass list. The type is taken from the header information of the request sent for accessing the media. If the media type is on the list, processing of the rule set stops. The writing rule of the rule set is then not processed. Processing continues with the next rule set. Note: This rule is not enabled by default. Enable web cache Always –> Continue — Enable Web Cache The rule is always processed unless it is skipped because the rules preceding it it in the rule set apply. It uses an event to enable the web cache, so objects can be written to it. Processing continues with the next rule set. 76 McAfee Web Gateway 7.1.5 Product Guide
Bypass lists for web caching Proxies and caching Web caching 3 You can fill bypass list with entries for web objects, such as URLs, media types, and others, to exclude these objects from caching. This section tells you how to work with these lists and describes some sample lists. There must be rules in a web cache rule set that use bypass lists and let the rules for reading from and writing to the cache not be processed. Note: This means that when you edit a bypass list, you also modify the rule that uses it. You should therefore make sure you know which rule uses a list that you edit. You can do this, for example, by reviewing the rules of the web cache rule set to see which list names appear in rule names and criteria. When you import a web cache rule set from the library, bypass lists are implemented with the rule set. You can edit these lists and also create lists of your own. The procedures used to maintain bypass lists differ according to the list type. For example, you can add wildcard expressions to a whitelist for URLs by typing them into the list. For example, you can add URLs to a bypass list for URLs by typing them into the list. When adding media types, however, you select them from folders with media type groups. For more information one the sample lists, see Sample lists for web caching. For the list activities, see Add a wildcard expression for URLs to a web cache bypassing list, and Add a media type to a web cache bypassing list. Sample lists for web caching This section describes two sample bypass lists for use with the web cache rules. When you import the Web Cache rule set from the library, these lists are also imported. You can find them on the Lists tab of the Policy top-level menu, sorted by their types and names. For general information on how to maintain lists, see List maintenance. Web Cache URL Bypass List Library list of wildcard expressions for URLs that should not be read to or written from the web cache. Type: Wildcard Expression The list is initially empty. The following table describes the list entries. Table 3-13 Web Cache URL Bypass List Option Definition Wildcard Expression Wildcard expresssion for URLs that should not be cached Comment Plain-text comment on the wildcard expression Web Cache Media Type Blocklist Library list of media types that should not be read to or written from the web cache. Type: Media type Initial entries: application/mpegurl — MP3 Playlist File application/x-pn-realaudio — RealMedia streaming file video/x-la-asf — Streaming Audio/Video File The following table describes the list entries. Table 3-14 Web Cache Media Type Blocklist Option Definition Media type Media type that should not be cached Comment Plain-text comment on the media type McAfee Web Gateway 7.1.5 Product Guide 77
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Product Guide McAfee ® version 7.1
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Contents Preface 9 About this guide
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Contents Standard authentication .
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Contents Create an error handler .
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Preface About this guide This Produ
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Table i-2 Acronyms (continued) Acro
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1 Introduction Contents Comprehensi
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Deployment of the McAfee Web Gatewa
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Operating system Introduction Filte
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Introduction Chapters of this guide
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2 Setup and logon Contents Setting
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Setup and logon Setting up the McAf
Page 25 and 26: Installing the appliance software S
Page 27 and 28: 2 Review the summary that is displa
Page 29 and 30: Import a license Setup and logon Lo
Page 31 and 32: Main elements of the user interface
Page 33 and 34: Setting up system management tools
Page 35 and 36: Setup and logon Setting up system m
Page 37 and 38: 3 Proxies and caching Contents Inte
Page 39 and 40: Explicit proxy mode Proxies and cac
Page 41 and 42: Table 3-1 WCCP Services list (conti
Page 43 and 44: Proxies and caching Network modes 3
Page 45 and 46: Transparent bridge mode Proxies and
Page 49 and 50: Transparent router mode Proxies and
Page 53 and 54: Common proxy settings Proxies and c
Page 55 and 56: Proxies and caching Common proxy se
Page 61 and 62: 8 Make sure the following is config
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Page 71 and 72: Proxies and caching Providing proxy
Page 73 and 74: Preventing data leaks Proxies and c
Page 75: Web caching Proxies and caching Web
Page 79 and 80: Verify the enabling of the web cach
Page 81 and 82: 4 Rules and rule sets Contents Filt
Page 83 and 84: Rules and rule sets Filtering contr
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Page 89 and 90: Property of a URL Property — URL.
Page 91 and 92: About rule sets Rules and rule sets
Page 93 and 94: Rules and rule sets About rule sets
Page 95 and 96: Table 4-4 Rule set library Rule set
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Page 107 and 108: Rules and rule sets Rule configurat
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Page 111 and 112: List maintenance Rules and rule set
Page 113 and 114: Add a list Complete the following p
Page 115 and 116: Action and engine settings Rules an
Page 117 and 118: Access restrictions Rules and rule
Page 119 and 120: 5 Filtering users Authentication an
Page 121 and 122: Authentication and access managemen
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Module for authenticating users Aut
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Authentication and access managemen
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LDAP Settings specifying the LDAP m
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Novell eDirectory Settings specifyi
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Kerberos Settings specifying the Ke
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Table 5-8 Certificate Authorities l
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Administrator accounts Authenticati
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6 Web filtering Contents Filtering
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Virus and malware filtering Web fil
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Web filtering Virus and malware fil
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Whitelists for virus and malware fi
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Module for virus and malware filter
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URL filtering Web filtering URL fil
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Web filtering URL filtering 6 The B
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Modify a filtering rule to block un
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Web filtering URL filtering 6 Add a
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Module for URL filtering Web filter
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Web filtering URL filtering 6 Advan
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Different versions of URL category
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Web filtering Media type filtering
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Web filtering Media type filtering
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Lists for media type filtering Web
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HTML filtering Web filtering HTML f
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Web filtering HTML filtering 6 Embe
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Break; User-Defined.removeOneScript
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Media Type String Blocklist List of
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Global whitelists Web filtering Glo
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Web filtering SSL scanning 6 Handle
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Block untrusted certificate authori
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Web filtering SSL scanning 6 Verify
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Modules for SSL scanning Web filter
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Web filtering SSL scanning 6 SSL Cl
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8 Click OK. The window closes and t
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The rule set contains the following
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Bandwidth throttling Web filtering
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Next-hop proxies Web filtering Supp
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Web filtering Supporting functions
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User messages Web filtering User me
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The following table describes the o
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Table 6-25 Template Editor (continu
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Web filtering User messages 6 Redir
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7 System configuration Contents Con
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System settings System configuratio
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Table 7-4 List of sections on syste
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License system settings System conf
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Network Protection system settings
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System configuration System setting
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Database updates Table 7-13 File Ed
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System configuration Database updat
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Configure central management settin
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System configuration Central manage
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Scheduled job settings This section
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System configuration Central manage
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8 Monitoring Contents Monitoring th
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Monitoring Dashboard 8 Overview of
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Charts and Tables tab Monitoring Da
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Table 8-4 Overview of charts and ta
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Logging Monitoring Logging 8 Applia
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Sample logging rule Monitoring Logg
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13 Configure the following for the
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Monitoring Logging 8 4 Go to Policy
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+ Number.ToString (Block.ID) + “
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Create a rule for setting text as t
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Monitoring Logging 8 • In the Con
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Configuring log file settings Monit
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Monitoring Logging 8 Auto Pushing S
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Log handler rule sets Monitoring Lo
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Performance measurement Monitoring
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Monitoring Performance measurement
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Transferring data to an ePO server
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Event monitoring with SNMP Monitori
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Error handling Table 8-7 Trap Sinks
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Rule sets for error handling Monito
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The rule set contains the following
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Monitoring Error handling 8 Handle
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Monitoring Error handling 8 Block o
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9 Troubleshooting Contents Troubles
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Enable the creation of connection t
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List of actions Appendix: Configura
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Table A-2 List of error IDs (contin
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Table A-3 List of events (continued
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Table A-3 List of events (continued
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List of incident IDs Appendix: Conf
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Table A-4 List of incident IDs (con
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Table A-5 List of properties (conti
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Wildcard expressions Appendix: Conf
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Table A-6 List of important special
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Table A-7 List of important special
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Index A access restrictions 117 act
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I ICAP server, see proxies ICQ, see
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SNMP monitoring 303 SSL scanning Ce
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