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Querying DNS Servers
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Windows XP Professional allows multiple DNS servers to be specified. The first DNS server specified, known as the preferred DNS server, can be followed by an unlimited number of alternate DNS servers. The resolver queries the DNS servers in the following order: 1. The resolver sends the query to the first server on the preferred adapter s search list and waits one second for a response. 2. If the resolver does not receive a response from the first server within the allotted time, it sends the query to the first DNS server on the search list of each adapter still under consideration. The resolver waits two seconds for a response. 3. If the resolver does not receive a response from any server within this allotted time, the resolver sends the query to all DNS servers on all adapters still under consideration and waits another two seconds for a response. 4. If the resolver still does not receive a response from any server within this time period, it sends the query to all DNS servers on all adapters still under consideration and waits four seconds for a response.
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Part IV:
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5. If, after these four seconds, the resolver does not receive a response from any server, it sends the query to all DNS servers on all adapters still under consideration and waits eight seconds for a response. 6. If the resolver receives a positive response within that time, it stops querying for the name, adds the response to the cache, and returns the response to the client.
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C From flowchart DNS Name Resolution.
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Check cache (Hosts file is preloaded into cache).
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No Successful Yes
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Query first server on the list of DNS servers for the preferred adapter.
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No Positive Yes response received within one second
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No Negative response Yes returned Adapter removed from consideration.
Query first server on all adapters still under consideration. No No Positive Negative response response Yes Yes received returned within two seconds Adapter removed from consideration. Yes Any adapters No still under consideration D Return to flowchart DNS Name Resolution. 3
Yes Any adapters No still under consideration D Return to flowchart DNS Name Resolution.
Response returned.
Response added to cache.
Figure 24-9
Querying the DNS server, part 1
24:
Configuring IP Addressing and Name Resolution
Query all servers on all adapters under consideration. No No Positive Negative response response received returned Yes within two Yes seconds Adapter removed from consideration. Yes Any adapters still under No consideration D Return to flowchart DNS Name Resolution. Query all servers on all adapters still under consideration. No No Positive Negative response response received Yes returned within four seconds Yes Adapter removed from consideration. Yes Any adapters still under No consideration
Response returned.
Response added to cache.
Return to flowchart DNS Name Resolution. 4
Figure 24-10
Querying the DNS server, part 2
If it has not received a response from any server within those eight seconds, the resolver responds with a time-out. Also, if it has not received a response from any server on a specified adapter s search list, the resolver, for the next 30 seconds, responds to all queries destined for servers on that adapter s search list with a time-out and does not query those servers. If, at any point, the resolver receives a negative response from a server, it removes every server connected to that adapter from consideration during this search. For example, if in step 2, the first server on alternate adapter A gave a negative response, the resolver would not send the query to any other server on the list for alternate adapter A.
Part IV:
Networking
Query all servers on all adapters still under consideration.
For any adapter that does not respond within eight seconds, resolver gives time-out on all queries for the next 30 seconds.
No Response returned Yes within eight seconds
Response (positive or negative) added to cache.
No Is the response Yes positive
Return to flowchart DNS Name Resolution.
Response returned.
Figure 24-11
Querying the DNS server, part 3
The resolver also keeps track of which servers answer queries more quickly, and it might move servers up or down on the list based on how quickly they reply to queries. If all DNS servers on an adapter are queried and none reply, either positively or negatively, all subsequent name queries to any server listed on that adapter will fail for a default period of 30 seconds. This feature decreases network traffic. Figure 24-12 shows how the resolver queries each server on each adapter.
24:
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