Network ToolsVijay Vasudevan1Monday, February 11, 2008Overview•Network simulation through ns-2•Network tools:•ping•traceroute•whois•dig•Scripting!2Monday, February 11, 2008ns-2•Creatively named “The Network Simulator”•To a different presentation file we go!3Monday, February 11, 2008Ping? Pong!•ping - send a ICMP ping message to a remote destination, which returns information about the RTT, ttl.•$ ping www.google.comPING www.l.google.com (64.233.169.147): 56 data bytes64 bytes from 64.233.169.147: icmp_seq=0 ttl=245 time=15.505 ms64 bytes from 64.233.169.147: icmp_seq=1 ttl=245 time=15.586 ms64 bytes from 64.233.169.147: icmp_seq=2 ttl=245 time=16.204 ms64 bytes from 64.233.169.147: icmp_seq=3 ttl=245 time=15.585 ms64 bytes from 64.233.169.147: icmp_seq=4 ttl=245 time=15.559 ms4Monday, February 11, 2008Traceroute•Traceroute: trace the IP path to a destination•$ traceroute www.google.comtraceroute: Warning: www.google.com has multiple addresses; using 64.233.169.147traceroute to www.l.google.com (64.233.169.147), 64 hops max, 40 byte packets 1 128.237.224.2 (128.237.224.2) 1.803 ms 1.608 ms 6.027 ms 2 CORE0-VL914.GW.CMU.NET (128.2.0.155) 152.642 ms 217.223 ms 2.105 ms 3 POD-I-CYH-VL986.GW.CMU.NET (128.2.0.250) 1.456 ms 1.165 ms 1.346 ms 4 bar-cmu-ge-4-0-0-2.3rox.net (192.88.115.185) 118.413 ms 82.660 ms 107.321 ms 5 minithan-bar-transitrail-10ge-0-1-0-0-203.3rox.net (192.88.115.26) 2.160 ms 2.430 ms 3.622 ms 6 te2-1--577.tr01-asbnva01.transitrail.net (137.164.131.193) 8.133 ms 7.933 ms 7.924 ms 7 google-peer.asbnva01.transitrail.net (137.164.130.154) 7.906 ms 7.692 ms 7.712 ms 8 216.239.48.110 (216.239.48.110) 15.832 ms 216.239.48.108 (216.239.48.108) 15.421 ms 216.239.48.110 (216.239.48.110) 15.402 ms 9 64.233.175.109 (64.233.175.109) 15.817 ms 64.233.175.169 (64.233.175.169) 16.976 ms 15.335 ms10 72.14.232.21 (72.14.232.21) 18.666 ms 18.350 ms 72.14.232.25 (72.14.232.25) 18.310 ms11 yo-in-f147.google.com (64.233.169.147) 17.773 ms 15.590 ms 15.639 ms5Monday, February 11, 2008whois•Domain name/AS number directory service•whois -a 64.233.169.147OrgName: Google Inc.OrgID: GOGL (they do nothing!)Address: 1600 Amphitheatre ParkwayCity: Mountain ViewStateProv: CA. . .6Monday, February 11, 2008dig•DNS Lookup, Reverse DNS Lookup•dig www.google.com;; QUESTION SECTION:;www.google.com. IN A;; ANSWER SECTION:www.google.com. 140939 IN CNAME www.l.google.com.www.l.google.com. 54 IN A 64.233.169.104www.l.google.com. 54 IN A 64.233.169.99www.l.google.com. 54 IN A 64.233.169.147www.l.google.com. 54 IN A 64.233.169.103•dig -x 64.233.169.147;; QUESTION SECTION:;147.169.233.64.in-addr.arpa. IN PTR;; ANSWER SECTION:147.169.233.64.in-addr.arpa. 84783 IN PTR yo-in-f147.google.com.7Monday, February 11, 2008Sleuthing on the Intarnets•Sometimes an IP can tell a lot•The story of the edited CMCL wiki•Sometimes it can’t•Tor (what is it good for? anonymizing sources! (say it again))•Lesson?•If you’re going to do something bad, anonymize your traffic•Or launch it remotely8Monday, February 11, 2008Scripting•Choices! Perl, Python, Ruby, Shell scripting•I <3 Ruby, but you can use any of them. *•Take the time to write a script for your experiments. It will pay off in the long run.•. . . ns example* - you’ll be using Ruby in a later hw :).9Monday, February 11, 2008Scriptroute•System for performing network measurements•Runs on PlanetLab: distributed measurements!•Uses . . . Ruby! *gasp*•Provides an easy-to-use software interface to send out measurements and obtain statistics and data•More on Scriptroute later (Tools HW 2). 10Monday, February 11, 2008Conch-collusion•Network tools and simulators are useful. •The heart of network measurement!•Useful not only for this class but in real life (because they are logically separate).11Monday, February 11,
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