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SC_ALLY(1)             DragonFly General Commands Manual            SC_ALLY(1)


NAME

     sc_ally - scamper driver to run Ally on a list of candidate aliases.


SYNOPSIS

     sc_ally [-?D] [-i infile] [-o outfile] [-p port] [-U unix-socket]
             [-f fudge] [-i probe-wait] [-q attempts] [-t logfile]
             [-w waittime]


DESCRIPTION

     The sc_ally utility provides the ability to connect to a running
     scamper(1) instance and have a set of IPv4 address-pairs tested for
     aliases using the Ally technique.  For each address pair in the file,
     sc_ally establishes which probe methods (UDP, TCP-ack, ICMP-echo) solicit
     an incrementing IP-ID value, and then uses the Ally technique on pairs
     where a probe method is able to obtain an incrementing IP-ID for both
     addresses.  The output is written to a warts file.  The options are as
     follows:

     -?      prints a list of command line options and a synopsis of each.

     -D      causes sc_ally to detach and become a daemon.

     -i infile
             specifies the name of the input file which consists of a sequence
             of IPv4 address-pairs, one pair per line.

     -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
             accepting control socket connections.

     -U unix-socket
             specifies the name of a unix domain socket where scamper(1) is
             accepting control socket connections.

     -f fudge
             specifies the fudge factor to use when (1) inferring if IPIDs are
             assigned from a counter, and (2) inferring if two addresses share
             the same counter.

     -i probe-wait
             specifies the inter-probe gap for both ping and Ally
             measurements, in milliseconds.  The default is 1000ms (1 second);
             the minimum is 200ms, and the maximum is 2000ms.

     -q attempts
             specifies the number of times to try Ally when one of the
             addresses is unresponsive.

     -t logfile
             specifies the name of a file to log output from sc_ally generated
             at run time.

     -w waittime
             specifies the minimum length of time, in seconds, to wait between
             completing a measurement to a particular IP address and issuing
             the next.


EXAMPLE

     Given a set of IPv4-address pairs in a file named infile.txt:

     192.0.2.1 192.0.32.10
     192.0.2.2 192.0.31.8
     192.0.2.3 192.0.30.64

     and a scamper(1) daemon listening on port 31337, then these address-pairs
     can be tested for aliases using

     sc_ally -i infile.txt -o outfile.warts -p 31337


SEE ALSO

     N. Spring, R. Mahajan, and D. Wetherall, Measuring ISP topologies with
     Rocketfuel, Proc. ACM SIGCOMM 2002.  scamper(1), sc_wartsdump(1),
     sc_warts2text(1)


AUTHORS

     sc_ally is written by Matthew Luckie <mjl@luckie.org.nz>.

DragonFly 6.5-DEVELOPMENT        March 1, 2011       DragonFly 6.5-DEVELOPMENT

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