Administrator's Guide - Kerio Software Archive

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Traffic Policy Setting of NAT in the rule for email services is shown in figure 7.31. It is recommended to allow use of a back-up link for case that the reserved link fails. Otherwise, email services will be unavailable when the connection fails. Figure 7.31 Policy routing — setting NAT for a reserved link Let us suppose that the mailserver provides also Webmail and CalDAV services which use HTTP(s) protocol. Adding these protocols in the first rule would make all web traffic routed through the reserved link. To reach the desired goal, the rule can be modified by reserving the link for traffic with a specific server — see figure 7.32. Figure 7.32 Policy routing — a link reserved for a specific server Note: In the second rule, automatic interface selection is used. This means that the Internet 4Mbit link is also used for network traffic load balancing. Email traffic is certainly still respected and has higher priority on the link reserved by the first rule. This means that total load will be efficiently balanced between both links all the time. If you need to reserve a link only for a specific traffic (i.e. route other traffic through other links), go toConfiguration → Interfaces and set the speed of the link to 0 Mbit/s. In this case the link will not be used for automatic load balancing. Only traffic specified in corresponding traffic rules will be routed through it. 104
7.6 User accounts and groups in traffic rules Example: Optimization of network traffic load balancing <strong>Kerio</strong> Control provides two options of network traffic load balancing: per host (clients) or per connection (for details, refer to chapter 7.3). With respect to variability of applications on individual hosts and of user behavior, the best solution (more efficient use of individual links) proves to be the option of load balancing per connection. However, this mode may encounter problems with access to services where multiple connections get established at one moment (web pages and other web related services). The server can consider source addresses in individual connections as connection recovery after failure (this may lead for instance to expiration of the session) or as an attack attempt (in that case the service can get unavailable). This problem can be bridged over by policy routing. In case of “problematic” services (e.g. HTTP and HTTPS) the load will be balanced per host, i.e. all connections from one client will be routed through a particular Internet link so that their IP address will be identical (a single IP address will be used). To any other services, load balancing per connection will be applied — thus maximally efficient use of the capacity of available links will be reached. Meeting of the requirements will be guaranteed by using two NAT traffic rules — see figure 7.33. In the first rule, specify corresponding services and set the per host NAT mode. In the second rule, which will be applied for any other services, set the per connection NAT mode. Figure 7.33 Policy routing — load balancing optimization 7.6 User accounts and groups in traffic rules In traffic rules, source/destination can be specified also by user accounts or/and user groups. In traffic policy, each user account represents IP address of the host from which user is connected. This means that the rule is applied to users authenticated at the firewall only (when the user logs out, the rule is not effective any longer). This chapter is focused on various issues relating to use of user accounts in traffic rules as well as hints for their solution. Note: For detailed information on traffic rules definition, refer to chapter 7.3. How to enable certain users to access the Internet How to enable access to the Internet for specific users only Assuming that this problem applies to a private local network and Internet connection is performed through NAT, simply specify these users in the Source item in the NAT rule. 105
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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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Page 125 and 126: 9.1 DNS module of the firewall’s
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10.2 Bandwidth Limiter configuratio
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10.2 Bandwidth Limiter configuratio
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10.3 Detection of connections with
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11.1 Firewall User Authentication T
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11.1 Firewall User Authentication a
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12.1 Web interface and certificate
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12.2 User authentication at the web
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Chapter 13 HTTP and FTP filtering K
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13.2 URL Rules Rules in this sectio
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13.2 URL Rules for example a rule a
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13.2 URL Rules • A page informing
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13.3 Content Rating System (Kerio W
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13.3 Content Rating System (Kerio W
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13.4 Web content filtering by word
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13.4 Web content filtering by word
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13.5 FTP Policy Weight Word weight
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13.5 FTP Policy Open the General ta
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13.5 FTP Policy Scan content for vi
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14.2 How to choose and setup antivi
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14.2 How to choose and setup antivi
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14.3 HTTP and FTP scanning Warning:
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14.3 HTTP and FTP scanning Use the
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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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