qr code generator vb net Figure 10-2 shows how IPSec policies are comprised of rules, filters, and filter actions. in Visual Studio .NET

Drawer Code 39 Full ASCII in Visual Studio .NET Figure 10-2 shows how IPSec policies are comprised of rules, filters, and filter actions.

Figure 10-2 shows how IPSec policies are comprised of rules, filters, and filter actions.
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IPSec Policy Most Specific IPSec Policy Rule #1 IP Filter Lists Telnet Traffic from 192.168.3.32 POP3 Traffic from 192.168.3.200 All Telnet Traffic All POP3 Traffic All Traffic Filter Actions Negotiate Security (Require Encryption) Block
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IPSec Policy Rule #2
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IPSec Policy Rule #3
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Figure 10-2 IPSec policies, rules, filters, and filter actions
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IPSec Policy Example If you want to require that the local computer send and accept POP3 (basic e-mail) traffic only to and from the address 192.168.10.5 and also that this POP3 traffic always be encrypted, you should write two rules in a single IPSec policy. The first rule should encrypt traffic sent over TCP port 110 (POP3 s port) to and from the address 192.168.10.5, and the second rule should block all traffic sent over TCP port 110. This pair of rules produces the desired effect because when Windows evaluates an IPSec policy, the more specific rule takes precedence. If POP3 traffic is sent to or originates from 192.168.10.5, the communication matches the first rule and is negotiated according to the first rule s filter action. If POP3 traffic is sent to or originates from any other IP address, the second, more general rule is triggered, and the communication will be blocked according to the second rule s filter action. Figure 10-3 shows how these rules appear in such a policy.
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Figure 10-3 An example IPSec policy
NOTE
IP filter lists
In the example above only one IP f ilter is attached to each rule because only one destination (192.168.10.5) is specif ied. However, you can attach many IP f ilters to each rule for example, to encrypt POP3 traff ic from several specif ied servers. An IP f ilter list is the set of IP f ilters within an IPSec policy rule to which a f ilter action applies. Regardless of whether an IP f ilter list includes a single IP f ilter or many IP f ilters, you associate only a single f ilter action with an IP f ilter list and IPSec policy rule.
Quick Check
1. Does every IPSec policy rule have an IP filter list 2. In terms of its function within an IPSec policy, what does a filter action do Quick Check Answers 1. Yes, even if the list has only one IP filter. 2. A filter action determines whether the traffic captured by an IP filter in a given policy rule is permitted, blocked, encrypted, or authenticated.
Connection Security Rules
You can also use Connection Security Rules to configure IPSec settings for specific connections between a local computer and other computers. Like IPSec policies, Connection Security Rules evaluate network traffic and then block, allow, or negotiate security for messages based on the criteria you establish. Unlike IPSec policies, however, Connection Security Rules do not
Lesson 1: Securing Network Traffic
include filters or filter actions. The features provided by filters and filter actions are built into each Connection Security Rule, but the filtering capabilities in Connection Security Rules are not as powerful as those of IPSec policies. Connection Security Rules do not apply to types of IP traffic, such as IP traffic that passes over port 23. Instead, they apply to all IP traffic originating from or destined for certain IP addresses, subnets, or servers on the network. A Connection Security Rule first authenticates the computers defined in the rule before they begin communication and then secures the information sent between these two authenticated computers. If you have configured a Connection Security Rule that requires security for a given connection and the two computers in question cannot authenticate each other, the connection is blocked. By default, Connection Security Rules provide only data authentication security (data origin authentication, data integrity, and anti-replay security). For this reason, Connection Security Rules are typically said only to authenticate connections. However, you can also configure data encryption for Connection Security Rules so that the connections in question are truly secured and not merely authenticated. Figure 10-4 shows a Connection Security Rule that requires secure communications within a given domain.
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