SC_SPEEDTRAP(1) BSD General Commands Manual SC_SPEEDTRAP(1)NAMEsc_speedtrap — scamper driver to resolve aliases for a set of IPv6 inter‐
faces.
SYNOPSISsc_speedtrap [-I] [-a addressfile] [-A aliasfile] [-l logfile]
[-o outfile] [-p port] [-s stop] [-S skipfile]
[-U unix-socket]
sc_speedtrap [-d dump] [file ...]
DESCRIPTION
The sc_speedtrap utility provides the ability to connect to a running
scamper(1) instance and have resolve a set of IPv6 addresses for aliases
using the "speedtrap" technique. sc_speedtrap induces each address to
send fragmented ICMP echo replies, with the goal of obtaining an incre‐
menting Identifier (ID) field in the fragmentation header. If two
addresses are aliases, they will return ICMP echo replies with a monoton‐
ically increasing value in the ID field because the ID field is imple‐
mented as a counter shared amongst all interfaces. sc_speedtrap imple‐
ments a scalable algorithm to quickly determine which addresses are
aliases. For further information about the algorithm is found in the
"see also" section. The supported options to sc_speedtrap are as fol‐
lows:
-a addressfile
specifies the name of the input file which consists of a sequence
of IPv6 addresses to resolve for aliases, one address per line.
-A aliasfile
specifies the name of an output file which will receive pairs of
aliases, one address-pair per line.
-d dump
specifies the number identifying an analysis task to conduct.
Valid dump numbers are 1-3. See the examples section.
-I specifies that the addressfile contains only interfaces known to
send fragmentation headers containing incrementing values.
-l logfile
specifies the name of a file to log output from sc_speedtrap gen‐
erated at run time.
-o outfile
specifies the name of the output file to be written. The output
file will use the warts format.
-p port
specifies the port on the local host where scamper(1) is accept‐
ing control socket connections.
-s stop
specifies the step at which sc_speedtrap should halt. The avail‐
able steps are "classify", "descend", "overlap", "descend2",
"candidates", and "ally".
-S skipfile
specifies the name of an input file which contains known aliases
that do not need to be resolved, one address-pair per line.
-U unix-socket
specifies the name of a unix domain socket where scamper(1) is
accepting control socket connections.
EXAMPLES
Given a set of IPv6 addresses contained in a file named addressfile.txt
and a scamper process listening on port 31337 configured to probe at 30
packets per second started as follows:
scamper -P 31337 -p 30
the following command will resolve the addresses for aliases, store the
raw measurements in outfile1.warts, and record the interface-pairs that
are aliases in aliases.txt:
sc_speedtrap-p 31337 -a addressfile.txt -o outfile1.warts -A
aliases.txt
The next example is useful when inferring aliases from multiple vantage
points. Given the output of aliases.txt from a previous measurement, the
following will resolve the addressfile for aliases, skipping those in
aliases.txt, and appending the new aliases to aliases.txt:
sc_speedtrap-p 31337 -a addressfile.txt -o outfile2.warts -A
aliases.txt -S aliases.txt
To obtain a transitive closure of routers from an input warts file:
sc_speedtrap-d 1 outfile1.warts
To obtain a list of the interfaces probed and their IPID behaviour:
sc_speedtrap-d 2 outfile1.warts
To obtain statistics of how many probes are sent in each stage, and how
long the stage takes:
sc_speedtrap-d 3 outfile1.warts
SEE ALSO
M. Luckie, R. Beverly, W. Brinkmeyer, and k. claffy, Speedtrap: Internet-
scale IPv6 Alias Resolution, Proc. ACM/SIGCOMM Internet Measurement
Conference 2013. scamper(1), sc_ally(1), sc_ipiddump(1),
sc_wartsdump(1), sc_warts2text(1), sc_warts2json(1),
AUTHORSsc_speedtrap is written by Matthew Luckie <mjl@luckie.org.nz>.
BSD August 18, 2013 BSD
