Administrator's Guide - Kerio Software Archive

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Configuration of network services Figure 9.16 HTTP cache configuration Cache size Size of the cache file on the disk. Maximal cache size allowed is 2 GB (2047 MB). However tests in field prove that with size larger than 1 GB (1024 MB), the speed of object search and thus the efficiency of the cache decreases significantly. Therefore, it is not recommended to create cache larger than 1 GB. The cache is located in the cache subdirectory of the Kerio Control’s head directory, i.e.: • in Windows edition typically: C:\Program Files\Kerio\WinRoute\Firewall\cache • in Software Appliance / VMware Virtual Appliance edition always: /opt/kerio/winroute/cache It is necessary that there is enough free space on the particular drive or to change cache size according to the free disk space. Note: 1. If 98 per cent of the cache is full, a so called cleaning will be run — this function will remove all objects with expired TTL. If no objects are deleted successfully, no 148
9.5 HTTP cache other objects can be stored into the cache unless there is more free space on the disk (made by further cleaning or by manual removal). 2. If the maximum cache size set is larger than the free space on the corresponding disk, the cache is not initialized and the following error is recorded in the Error log (see chapter 22.8). Max HTTP object size maximal size of the object that can be stored in cache. With respect to statistics, the highest number of requests are for small objects (i.e. HTML pages, images, etc.). Big sized objects, such as archives (that are usually downloaded at once), would require too much memory in the cache. Cache Options Advanced options where cache behavior can be defined. • Continue aborted download — tick this option to enable automatic download of objects that have been aborted by the user (using the Stop button in a browser). Users often abort downloads for slow pages. If any user attempts to open the same page again, the page will be available in the cache and downloads will be much faster. • Cache responses ’302 Redirect’ — this option accelerates connection to redirected web pages. Under usual circumstances, 302 Redirect responses are not cached. HTTP protocol’s return code 302 stands for temporary redirection — such redirection can be canceled any time or the target URL can change. If user applies the cached response to open a web page, the client can be redirected to an obsolete or invalid URL. • Use server supplied Time-To-Live — objects will be cached for time specified by the Web server from which they are downloaded. If TTL is not specified by the server, the default TTL will be used (see the HTTP protocol TTL item). Warning: Some web servers may attempt to bypass the cache by too short/long TTL. • Ignore server Cache-Control directive — Kerio Control will ignore directives for cache control of web pages. Pages often include a directive that the page will not be saved into the cache. This directive page may be misused for example to bypass the cache. Enable the Ignore server Cache-Control directive option to make Kerio Control accept only no-store and private directives. Note: Kerio Control examines HTTP header directives of responses, not Web pages. • Always validate file in cache — with each query Kerio Control will check the server for updates of objects stored in the cache (regardless of whether the client demands this). 149
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Kerio Control Administrator’s Gui
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Contents 1 Quick Checklist . . . .
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13 HTTP and FTP filtering . . . . .
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26 Technical support . . . . . . .
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8. Enable the intrusion prevention
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2.2 Conflicting software Warning: S
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2.3 System requirements met). 2.3 S
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2.4 Installation - Windows • TCP/
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2.4 Installation - Windows Warning:
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2.5 Initial configuration wizard (W
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2.6 Upgrade and Uninstallation - Wi
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2.7 Installation - Software Applian
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2.7 Installation - Software Applian
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2.10 Kerio Control Engine Monitor (
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2.11 The firewall’s console (Soft
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3.1 Kerio Control Administration we
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3.2 Administration Console - the ma
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3.3 Administration Console - view p
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Chapter 4 License and Registration
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4.3 License information User is def
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4.4 Registration of the product in
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4.6 Subscription / Update Expiratio
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Chapter 5 Network interfaces Kerio
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5.3 Viewing and editing interfaces
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5.3 Viewing and editing interfaces
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5.5 Advanced dial-up settings Figur
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5.6 Supportive scripts for link con
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6.1 Persistent connection with a si
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6.1 Persistent connection with a si
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6.2 Connection with a single leased
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6.3 Connection Failover Advanced di
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6.3 Connection Failover Figure 6.8
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6.4 Network Load Balancing Note: 1.
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6.4 Network Load Balancing On the t
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6.4 Network Load Balancing Hint: Sp
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Chapter 7 Traffic Policy Traffic Ru
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7.1 Network Rules Wizard Step 4 —
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7.1 Network Rules Wizard Figure 7.5
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7.1 Network Rules Wizard Note: In t
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7.3 Definition of Custom Traffic Ru
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Page 125 and 126: 9.1 DNS module of the firewall’s
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Page 129 and 130: 9.1 DNS module Figure 9.3 Specific
Page 131 and 132: 9.2 DHCP server If the Do not forwa
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Page 143 and 144: 9.3 Dynamic DNS for public IP addre
Page 145 and 146: 9.4 Proxy server Proxy Server Confi
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Page 155 and 156: 10.2 Bandwidth Limiter configuratio
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Page 159 and 160: 10.3 Detection of connections with
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Page 165 and 166: 12.1 Web interface and certificate
Page 167 and 168: 12.2 User authentication at the web
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Page 171 and 172: 13.2 URL Rules Rules in this sectio
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Page 177 and 178: 13.3 Content Rating System (Kerio W
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Page 191 and 192: 14.2 How to choose and setup antivi
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14.4 Email scanning If only an aste
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14.4 Email scanning Figure 14.9 Set
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14.5 Scanning of files transferred
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15.2 Time Ranges Figure 15.2 IP gro
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15.3 Services Figure 15.4 Time rang
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15.3 Services Protocol The communic
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15.4 URL Groups Note: 1. Generally,
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15.4 URL Groups Examples:: • www.
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16.1 Viewing and definitions of use
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16.2 Local user accounts Accounts m
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16.2 Local user accounts Name Usern
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16.2 Local user accounts Step 3 —
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16.2 Local user accounts Figure 16.
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16.2 Local user accounts Within thi
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16.3 Local user database: external
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16.4 User accounts in Active Direct
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16.5 User groups Note: In case of u
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16.5 User groups Using the Add and
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Chapter 17 Administrative settings
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17.3 Update Checking Figure 17.2 Tr
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17.3 Update Checking Last update ch
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18.1 Routing table Route Types The
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18.2 Universal Plug-and-Play (UPnP)
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18.3 Relay SMTP server 18.3 Relay S
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Chapter 19 Status Information Kerio
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19.1 Active hosts and connected use
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19.2 Network connections overview
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19.2 Network connections overview F
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19.4 Alerts • Session duration.
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19.4 Alerts • Connection failover
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19.4 Alerts Click an event to view
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20.1 Volume of transferred data and
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20.2 Interface statistics Figure 20
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20.2 Interface statistics Figure 20
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21.1 Monitoring and storage of stat
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21.2 Settings for statistics and qu
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21.3 Connection to StaR and viewing
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21.3 Connection to StaR and viewing
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22.1 Log settings Figure 22.1 Log s
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22.1 Log settings Figure 22.3 Syslo
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22.2 Logs Context Menu • Target f
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22.3 Alert Log Figure 22.7 Highligh
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22.5 Connection Log A typical examp
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22.6 Debug Log The expression must
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22.7 Dial Log 3. Disconnection caus
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22.9 Filter Log • 8000-8099 — H
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22.10 Http log Packet log example:
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22.11 Security Log An example of Ht
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22.11 Security Log Example: [17/Jul
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22.13 Warning Log Events causing di
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Chapter 23 Kerio VPN Kerio Control
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23.1 VPN Server Configuration Figur
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23.1 VPN Server Configuration the V
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23.1 VPN Server Configuration Kerio
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23.3 Interconnection of two private
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23.4 Exchange of routing informatio
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23.5 Example of Kerio VPN configura
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23.6 Example of a more complex Keri
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24.1 Kerio Control SSL-VPN configur
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Chapter 25 Specific settings and tr
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25.3 Automatic user authentication
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25.3 Automatic user authentication
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25.4 FTP over Kerio Control proxy s
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25.5 Internet links dialed on deman
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The text file will be stored in the
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Appendix B Used open source items K
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Copyright © 2005 Harald Welte Dist
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Glossary of terms ActiveX This Micr
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Ident The Ident protocol is used fo
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Policy routing Advanced routing tec
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TCP Transmission Control Protocol i
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dial-up 64 dialing scripts 21, 58 h
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S service 89, 207 SIP 210 SSL-VPN 3
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