Characterizes ICMP responsiveness of routers.
Icmp Tool provides a straight-forward way to characterize the responsiveness to TTL-limited probes of routers close to you. The tool is based on code we used for a large scale campaign on PlanetLab. For details on how the router classification works, refer to our paper “Characterizing ICMP Rate Limitation on Routers”: http://goo.gl/cU004b Typical usage looks like this:
#!/usr/bin/env python from icmptool import icmptool routers_by_hop = icmptool(dest='184.108.40.206', ttls=[1,2,3], min_rate=1, max_rate=500, n_of_rates=5, duration=8) for hop in routers_by_hop: for router in routers_by_hop[hop]: print "router %s at hop %s is of type %s for the tested probing rates" % ( router, hop, routers_by_hop[hop][router]['rtype_description']) if 'fr-onoff' in routers_by_hop[hop][router]['rtype_str']: print("\tOn-off parameters are:\n\t\tBurst Size: " "%s packets\n\t\tInter Burst Time: %s seconds" "\n\t\t=> max answering rate %d pps " % (routers_by_hop[hop][router]['onoff_parameters']['bsize'], routers_by_hop[hop][router]['onoff_parameters']['iat'], routers_by_hop[hop][router]['onoff_parameters']['bsize'])) elif 'fr-rl' in routers_by_hop[hop][router]['rtype_str']: #generically rate-limited print "\tMaximum answering rate is %s" % routers_by_hop[hop][router]['extra_info']['limited_ans_rate']
By doing that, we probed routers at hops 1, 2, 3 on the path to 220.127.116.11, at 5 exponentially-spaced probing rates between 1 pps and 500 pps, for 8 seconds each time. routers_by_hop will now contain at key i details of the responsiveness of the router on hop i.
Alternatively, the script icmp_tool.py can be called from the shell to perform the same task. The above example simply becomes:
$ ./icmp_tool.py --dest 18.104.22.168 --ttls 1 2 3 --min_rate 1 --max_rate 500 --n_of_rates 5 --duration 8
Icmp Tool sends TTL-limited probes at constant rate(s) to the routers at the specified hops and by studying the timeseries of the received ICMP time-exceeded replies it determines the responsiveness of nearby routers to these probes. A responsive router typically shows 3 responsiveness phases in the following order:
[fully-responsive] [rate-limited] [irregular]
Depending on the chosen probing rates and on the configuration of the router, not all phases might appear. The most common implementation of rate limitation is with an on-off pattern, of which we provide the parameters: burst size, period length and resulting answering rate. In some cases, rate limitation is implemented with a maximum constant answering rate, but no such pattern is observable. We call this a generically rate-limited router (rl). The irregular phase, if any, might appear whether or not rate limitation has been configured. After a certain threshold, the responsiveness of the router might simply not follow (any more) any pattern and become less predictable.
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