create qr barcode c# Secondary Zones, Stub Zones, and Conditional Forwarding in Visual C#.NET

Creation QR in Visual C#.NET Secondary Zones, Stub Zones, and Conditional Forwarding

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Another benefit of Active Directory integration is the ability to perform conditional forwarding. By using conditional forwarding, you can eliminate the split-brain syndrome when internal requests get incorrectly forwarded to external DNS servers. Finally, with dynamic updates using DHCP, clients gain the ability to use secure dynamic updates. Security dynamic updates ensure that only those clients that created a record can subsequently update the record. You ll find more on secure dynamic updates in the section entitled Security Considerations later in this chapter.
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Secondary Zones, Stub Zones, and Conditional Forwarding
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Secondary zones, stub zones, and conditional forwarding can all be used to resolve name resolution problems chiefly the split-brain scenario in which internal DNS servers blindly forward any requests that they can t resolve to external servers. Rather than blindly forwarding requests, you can configure internal servers so that they know about certain DNS domains. This ensures name resolution works for domains that aren t known on the public Internet and can also be used to speed up name resolution for known domains, which makes users much happier than if name resolution fails or they have to wait all the time for name requests to be resolved.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Architecting DNS Infrastructure By using a secondary zone, you create a complete copy of a zone on a DNS server that can be used to resolve DNS queries without having to go to the authoritative name server for that domain. Not only can this be used for subdomains of a parent domain that exists in different zones, but for different parent domains as well. For example, on the name servers for cpandl.com you could create secondary zones for a partner company, such as The Phone Company whose domain is thephone-company.com. In this way, DNS clients in the cpandl.com domain can perform fast lookups for hosts in thephone-company.com domain. The downside is that you must replicate DNS traffic between the domains. If this replication takes place over the public Internet, the administrators at The Phone Company would need to configure firewalls on their network to allow this and make other security changes as well, which might not be acceptable. Because you are maintaining a full copy of the zone, any change generates replication traffic. With a stub zone, you create a partial copy of a zone that has information about only the authoritative name servers in a zone. As Figure 26-7 shows, this allows a DNS server to forward queries directly to a name server for a particular domain and bypass the normal name server hierarchy. This speeds up the lookup because you don t have to go through multiple name servers to find the authoritative name server for a domain.
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Local name server DNS Root name server
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cpandl.com Stub zone .com name server
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Client thephone-company.com
F26ws07
www.cpandl.com
Figure 26-7.
Using stub zones for lookups.
Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out Stub zones work like this: When you set up a stub zone for a domain, only the resource records needed to identify the authoritative name servers for the related domain are transferred to the name server. These records include the SOA and NS records as well as the related A records for these servers (referred to as glue records). These records can be maintained in one of two ways. If you use Active Directory integration, the normal Active Directory replication process can be used to maintain the stub zone. If you use a standard stub zone, standard zone transfers are used to maintain the stub zone. Both techniques require access to the domain specified in the stub zone, which can be a security issue. Replication traffic isn t an issue, however, because you are maintaining a very small amount of data.
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Conditional forwarding is very similar to stub zones except that you don t need to transfer any information from the domain to which you want to forward requests. Instead, you configure names servers in domain A so that they know the IP address of the authoritative name servers in domain B, allowing these name servers to be used as forwarders. There s no access requirement, so you don t need permission to do this, and there s no bandwidth requirement, so you don t need to worry about extra replication traffic. By using conditional forwarding, there are some trade-offs to be made, however. If the authoritative name servers change, the IP addresses aren t updated automatically as they are with stub zones or secondary zones. This means you would have to reconfigure name servers manually in domain A with the new IP addresses of the authoritative name servers in domain B. When you configure conditional forwarders on a name server, the name server has to check the forwarders list each time it resolves a name. As the list grows, it requires more and more time to work through the list of potential forwarders.
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