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Measurement Setup
The measurement study reported in this work was
conducted between late 2006 and the first half of 2007. Our measurement
setup consists of seven IPv6/IPv4 dual-stack machines as shown in Fig. 1.
Our gateway is a dual-boot machine, running Windows XP and Fedora Core 5.
Our client machines are named ”BSD1-BSD4” and
”Fedora2-Fedora3”, with the BSD client machines running FreeBSD
6.1 and the Fedora client machines running Fedora Core 5. The network
interfaces of each machine are associated with one public IPv4 address and
one IPv6 address. Our testbed is connected by a 100Mbps link to the public
IPv4 Internet via the Hongkong Advanced Research
Network (HARNET). For IPv6, a 45Mbps link to Internet2 is also provided by
HARNET, which is shared with 7 other universities in Hong Kong.
Our measurements are designed to investigate the performance differences
perceived by dual-stack hosts as they choose between IPv6 and IPv4. Each
measurement test is conducted between one of the dual-stack machines in our
testbed and another publicly available dual-stack host site in the world.
We have compiled a list of 10,534 sites with IPv6 and IPv4 capabilities
from the following sources: the list maintained in [8], and the ones by major ISPs and DNS
servers including WIDE, IIJ, Consulintel, and ISC
[5].
We then used ping and ping6 to determine the sites’ reachability. As shown in Table I, amongst the 10,534
sites claimed to have dual-stack capabilities, only 2,014 sites are found
to be reachable via both IPv6 and IPv4. These 2,014 sites thus form our
list of dual-stack sites used in our measurement tests. In our study, every
measurement test is repeated 10 times during different times of the day and
different days of the week, and the reported
results are averaged over these runs.
Fig.
1. Setup of the CUHK IPv6/IPv4 Testbed
Table I. Dual-Stack Test Results
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Pingable
by IPv6
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Yes
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No
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Pingable
by IPv4
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Yes
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2014
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7054
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No
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208
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1103
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