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RTT
This test uses the same set of results in the Connectivity Test to
investigate the response times for ping packets to various dual-stack
sites. The response times provide an indication of the quality-of-service
experienced by a user in the IPv6/IPv4 networks. Our results in Figs. 4 and
5 show that the IPv6 RTTs are higher than the IPv4 RTTs. The average values
of the IPv6 RTT and IPv4 RTT are 403.36ms and 272.78ms respectively. At
first glance, the RTT results seemed to contradict the hop count results in
the Hop
Count Test, where we reported the hop counts of IPv6 paths
to be lower compared to IPv4 paths. In general, lower hop counts translate
to lower RTT for a path. However, due to the fact that the number of IPv6
nodes and its concentration are lower and less dense compared to IPv4
nodes, and that the direct link connectivity of the IPv6 networks is lower
compared to IPv4 networks, there is a high likelihood that IPv6 packets
need to travel a longer distance between successive hops compared to IPv4
packets (the IPv6 paths are significantly longer compared to that of IPv4
paths). The longer propagation delay experienced by IPv6 packets translates
to higher IPv6 RTTs compared to IPv4 RTTs. Our results also agree with the
results reported in previous works by [9] and [5] where the IPv6 RTTs are reported to
be higher than IPv4 RTTs. In [9], the results show that the average
IPv6 and IPv4 RTT values are 409.80ms and 281.84ms respectively, which
match closely with our RTT results. Conversely, in [1], their results show that the IPv6
RTTs are smaller than IPv4 RTTs. This could be due to their different
measurement setup and location.
Fig.
4. IPv6-IPv4 RTT Results
Fig.
5. Distribution of the IPv6-IPv4 RTT Results
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