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For the client and local DNS associations that are not in the same network
cluster, we ask whether there exist any local DNS servers in
those clusters. From our log, we collected a set of local DNS servers. Thus,
assuming the clients have access to those local DNS servers in their network
clusters, it is interesting to examine the degree of improvement if
all LDNS servers were used optimally.
This assumption is not unreasonable, since most IP addresses in the same
network cluster are under the same administrative control. From
Table 4, we can calculate the number of client ASes and
network clusters where there are no local DNS servers as observed in our
log. There are
such AS clusters, and
such network clusters. Table 7 compares the improved
percentages of client-LDNS associations and HTTP requests in the same cluster with
the original results. If the clients in our data currently configured to
use a LDNS in a different cluster are allowed to use an LDNS in the same
cluster, then at least 92% of the HTTP requests come from clients
using the LDNS in the same AS cluster. That number is 70% for network
clusters.
Table 7:
Improvement of the percentage of the client-LDNS associations
sharing the same cluster using optimal LDNS assignment
Metrics |
Client IPs |
HTTP requests |
|
Original |
Improved |
Original |
Improved |
AS cluster |
64% |
88% |
69% |
92% |
Network cluster |
16% |
66% |
24% |
70% |
Next: Clients using multiple local
Up: Analysis results
Previous: Round-trip time correlation