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SC_ALLY(1) General Commands Manual SC_ALLY(1) NAME sc_ally -- scamper driver to run Ally on a list of candidate aliases. SYNOPSIS sc_ally [-?D] [-a infile] [-o outfile] [-p port] [-U unix-socket] [-f fudge] [-i probe-wait] [-O options] [-q attempts] [-t logfile] [-w waittime] sc_ally [-d dump-id] [-O options] [file ...] DESCRIPTION The sc_ally utility provides the ability to connect to a running scamper(1) instance and have a set of IPv4 address sets tested for aliases using the Ally technique. For each address pair on a single line 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 in- crementing IP-ID for both addresses. sc_ally can also infer which IP addresses are aliases using the Mercator common source address tech- nique as a byproduct of the UDP probing that sc_ally does. The output of sc_ally is written to a warts(5) file, which can then be processed to extract aliases. 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. -a infile specifies the name of the input file which consists of a se- quence of IPv4 addresses, one candidate set per line. -o outfile specifies the name of the output file to be written. The out- put file will use the warts format. -p port specifies the port on the local host where scamper(1) is ac- cepting control socket connections. -U unix-socket specifies the name of a unix domain socket where scamper(1) is accepting control socket connections. -d dump-id specifies the number identifying an analysis to conduct. The current choices for are 1-3, and are: - 1: dump aliases inferred using the Ally (IPID-based) tech- nique. - 2: dump aliases inferred using the Mercator (common source address based) technique. - 3: dump aliases inferred using both Ally and Mercator techniques. -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. A value of zero will cause ally to in- fer aliases if the IPIDs are in a monotonic sequence. -i probe-wait specifies the inter-probe gap for both ping and Ally measure- ments, in milliseconds. The default is 1000ms (1 second); the minimum is 200ms, and the maximum is 2000ms. -O options allows the behavior of sc_ally to be further tailored. The current choices for this option are: - nobs: do not consider byte swapped IPID values when infer- ring if IPID values are assigned from a counter. - tc: dump transitive closure when reporting aliases. -q attempts specifies the number of probes to use with Ally. -t logfile specifies the name of a file to log output from sc_ally gener- ated at run time. -w waittime specifies the minimum length of time, in seconds, to wait be- tween completing a measurement to a particular IP address and issuing the next. EXAMPLES Given a set of IPv4-address sets in a file named infile.txt: 192.0.2.1 192.0.32.10 192.0.31.60 192.0.2.2 192.0.31.8 192.0.2.3 192.0.30.64 and a scamper(1) daemon listening on port 31337, then these addresses can be tested for aliases using sc_ally -a infile.txt -o outfile.warts -p 31337 To obtain a list of inferred alias pairs using the Ally technique from a warts(5) file: sc_ally -d 1 outfile.warts To obtain a list of inferred routers using a transitive closure of alias pairs inferred using the Ally and Mercator techniques: sc_ally -d 3 -O tc outfile.warts SEE ALSO scamper(1), sc_radargun(1), sc_wartsdump(1), sc_warts2text(1), N. Spring, R. Mahajan, and D. Wetherall, Measuring ISP topologies with Rocketfuel, Proc. ACM SIGCOMM 2002. R. Govindan and H. Tangmunarunkit, Heuristics for Internet Map Discovery, Proc. IEEE INFOCOM 2000. A. Bender, R. Sherwood, and N. Spring, Fixing Ally's growing pains with velocity modeling, Proc. ACM/SIGCOMM Internet Measurement Conference 2008. AUTHORS sc_ally was written by Matthew Luckie <mjl@luckie.org.nz>. FreeBSD Ports 14.quarterly May 4, 2019 SC_ALLY(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | AUTHORS
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