Welcome to Conor Cahir who starts work as a research student under my
supervision today. Conor's work is sponsored by Cisco, and he'll be
studying adaptive HTTP streaming and cache-aware TCP for streaming.
The following patches allow the
ns-3 network simulator, versions 3.11 and 3.12.1 to compile
and run on FreeBSD 8.2, with all core tests passing. The patch
for ns-3.11 fixes includes and missing declarations, while that
for ns-3.12.1 also updates FindSelfDirectory() in
src/core/model/system-path.cc to work on FreeBSD.
RFC 6336
has been published, defining the IANA Registry for ICE Options. This fixes an
oversight in RFC 5245,
which states that the registry for ICE options exists, but did not create
it with IANA or specify the syntax of
legal options. Defining this registry is a necessary precursor to the ECN
for RTP work, which needs to use an ICE option.
Compact routing algorithms have been presented as candidates for scalable
routing in the future Internet, achieving near-shortest path routing
with considerably less forwarding state than the Border Gateway
Protocol. Prior analyses have shown strong performance on power-law
random graphs, but to better understand the applicability of compact
routing algorithms in the context of the Internet, they must be
evaluated against real- world data. To this end, we present the first
systematic analysis of the behaviour of the Thorup-Zwick (TZ) and
Brady-Cowen (BC) compact routing algorithms on snapshots of the
Internet Autonomous System graph spanning a 14 year period. Both
algorithms are shown to offer consistently strong performance on the AS
graph, producing small forwarding tables with low stretch for all
snapshots tested. We find that the average stretch for the TZ algorithm
increases slightly as the AS graph has grown, while previous results on
synthetic data suggested the opposite would be true. We also present
new results to show which features of the algorithms contribute to
their strong performance on these graphs.
RTP packet traces for IPTV systems are large, but well structured.
While they compress reasonably well with a general-purpose compression
utility, such as gzip, better
performance can be achieved using a compressor that understands the
structure of RTP data.
The next
Scottish Networking Event will be held in Aberdeen, on 4 March
2011, hosted by Gorry
Fairhurst in the School of Engineering, University of Aberdeen.
Attendance is free, contact Gorry to register.