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To provide authorization for VPN connections and to provide a method of enforc ing connection restraints, Windows Server 2003 VPN connections use a combina tion of the dial-in properties of user accounts in a local or domain account database and remote access policies. Remote access policies are an ordered set of rules that define how connections are either accepted or rejected. For connections that are accepted, remote access poli cies can also define connection restrictions. For each rule, there are one or more conditions, a set of profile settings, and a remote access permission setting. Con nection attempts are evaluated against the remote access policies in order, trying to determine whether the connection attempt matches all the conditions of each policy. If the connection attempt does not match all the conditions of any policy, the connection attempt is rejected. If a connection matches all the conditions of a remote access policy and is granted remote access permission, the remote access policy profile specifies a set of con nection restrictions. The dial-in properties of the user account also provide a set of restrictions. Where applicable, user account connection restrictions override the remote access policy profile connection restrictions. Remote access policy profile restrictions include connection settings (such as maximum connection time or an idle timeout), IP packet filtering, required authentication protocols, and required encryption strengths.

Disabling Recursion The Forwarders tab allows you to disable recursion on any que ries, specified by domain, that have been configured to be forwarded to an upstream server. When recursion is not disabled (the default), the local DNS server attempts to resolve a fully qualified domain name (FQDN) after a forwarder has failed to do so. This condition is preferable if you want to optimize settings for fault tolerance: if the upstream forwarder is down, name resolution can fall back to the local DNS server. However, when under this default setting the forwarder receives the forwarded query and still fails to resolve it, the subsequent fallback recursion that occurs at the local DNS server is usually redundant and delays an inevitable query failure message response. Disabling recursion on queries for which forwarding has been configured thus optimizes the speed of negative query responses at the expense of fault tolerance. When forwarders are configured this way in combination with disabling recursion, the local DNS server is known as a slave server because in these cases, it is completely dependent on the forwarder for queries that it cannot resolve locally.

Save the original source code Before you begin fixing the defect, be sure to archive a version of the code that you can return to later. It s easy to forget which change in a group of changes is the significant one. If you have the original source code, at least you can compare the old and the new files and see where the changes are. Fix the problem, not the symptom You should fix the symptom too, but the focus should be on fixing the underlying problem rather than wrapping it in programming duct tape. If you

Do not confuse the use of the term slave server with the term slave zone, which is used in some implementations of DNS. In some non-Microsoft DNS servers, such as Berkeley Internet Name Domain (BIND), primary zones are called master zones and secondary zones are called slave zones.

don t thoroughly understand the problem, you re not fixing the code. You re fixing the symptom and making the code worse. Suppose you have this code:

5

Redundancy and load balancing are accomplished using either Domain Name Sys tem (DNS) or Network Load Balancing (NLB):

The Advanced tab, shown in Figure 5-6, allows you to enable, disable, and configure certain DNS server options and features such as recursion, round robin, automatic scavenging, and netmask ordering. To learn more about the features configurable on this tab, see Lesson 3, Configuring Advanced DNS Server Properties, in this chapter.

for ( claimNumber = 0; claimNumber < numClaims[ client ]; claimNumber++ ) { sum[ client ] = sum[ client ] + claimAmount[ claimNumber ]; }

Whereas the Forwarders tab allows you to disable recursion on selected queries for domains used with forwarders, the Advanced tab allows you to disable recursion for all que ries received by the local DNS server.

Note If you disable recursion on a DNS server using the Advanced tab, you cannot use forwarders on the same server, and the Forwarders tab becomes inactive.

that share a common security perimeter. A security perimeter has one exter nal DNS name for example, microsoft.com but several IP addresses, and loads are randomly distributed across all the IP addresses.

Further suppose that when client equals 45, sum turns out to be wrong by $3.45. Here s the wrong way to fix the problem: