barcode generator in vb.net free download Configuring the SunScreen Firewall in Software

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Configuring the SunScreen Firewall
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The best system for users who are new to Solaris is Sun s own SunScreen firewall (http://www.sun.com/software/securenet/lite/download.html). It comes in both a free and commercial edition, with the former being more than adequate for protecting small networks. It is available for both Solaris Intel and Solaris SPARC. The current release version is 3.1, which supports Gigabit Ethernet, SNMP management, and direct editing of security policy tables. However, it does not currently support IPv6. The firewall may be administered locally or remotely, by using a secure session. There are several important limitations that are placed on the Lite version of SunScreen:
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Routing and Firewalls
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It is designed to work with a system that is already acting as a router (if it wasn t, why would you want SunScreen anyway ). It does not operate in the special stealth mode employed by the commercial edition. It does not support any of the High Availability features of the commercial version. It does not support more than two network interfaces. However, as most routers have only two interfaces, this should not be an issue for small networks. It does not provide support for proxying. SunScreen can be operated in either GUI mode, through a standard Web browser such as Netscape Navigator, or by directly editing the system s configuration files. It is easy to install using the Web Start Wizard, which is provided with the installation package. To install the software, you need to run the /opt/SUNWicg/SunScreen/bin/ss_install script, which is extracted from the SunScreen distribution. There are several options that you need to configure for SunScreen to operate as desired: Routing or stealth mode operation Local or remote administration Restrictive, secure, or permissive security level Support for DNS resolution After choosing the appropriate option for your system, the following message will be displayed:
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--Adding interfaces & interface addresses --Initialize 'vars' databases --Initialize 'authuser' & 'proxyuser' databases --Initialize 'logmacro' database --Applying edits --Activating configuration loading skip keystore. Successfully initialized certificate database in /etc/skip/certdb starting skip key manager daemon. Configuration activated successfully on cassowary. Reboot the machine now for changes to take effect.
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After rebooting the system, the firewall software will be loaded into the kernel, after which you will need to add rules to the firewall, by using your browser to set the appropriate administration options. Figure 23-5 shows the browser starting on port 3852 on the localhost.
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Part V:
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Networking
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FIGURE 23-5
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Starting the SunScreen administrative interface
When first installed, the SunScreen username and password will be admin and admin , respectively. These should be entered into the Admin User and Password fields. After you click the Login button, the SunScreen Information page is displayed, as shown in Figure 23-6. At this point, you may view firewall logs, view connection statistics, and so on. However, most users will want to create a set of security policies immediately upon starting the firewall service. Security policies are based on rules that either ALLOW or DENY a packet to be transmitted from a source to a destination address. Alternatively, an address class may be specified by using wildcards. The main actions associated with ALLOW rules are LOG_NONE
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Routing and Firewalls
FIGURE 23-6
SunScreen Information interface
LOG_SUMMARY LOG_DETAIL SNMP_NONE SNMP The main actions associated with DENY rules are LOG_NONE LOG_SUMMARY LOG_DETAIL
Part V:
Networking
SNMP_NONE SNMP ICMP_NONE ICMP_NET_UNREACHABLE ICMP_HOST_UNREACHABLE ICMP_PORT_UNREACHABLE ICMP_NET_FORBIDDEN ICMP_HOST_FORBIDDEN Figure 23-7 shows how to define a rule with actions for the SMTP service, which is operated by sendmail. This allows mail to be transferred from local users to remote
FIGURE 23-7
Rule definition
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Routing and Firewalls
hosts. However, it you wanted to block all mail being sent to and from your network, you could create a DENY action within the rule for the SMTP service. The rule could be applied selectively to specific local subnets or remote destinations. Another useful feature is the ability to apply rules only for specific time periods. For example, if you worked in a bank, you could prevent all e-mail from being sent externally after 5 P.M. and before 9 A.M. Once you have entered a new rule, you can view it on the Policy Rules page, along with any other rules, as shown in Figure 23-8. The Policy Rules page enables you to add new rules and edit, move, or delete existing rules. For each packet-filtering rule, the service, source address, destination address, action timeframe, and name are shown.
FIGURE 23-8
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