traceroute の man を見ていたら

A more interesting example is:

    [yak 72]% traceroute allspice.lcs.mit.edu.
    traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
     1  helios.ee.lbl.gov (128.3.112.1)  0 ms  0 ms  0 ms
     2  lilac-dmc.Berkeley.EDU (128.32.216.1)  19 ms  19 ms  19 ms
     3  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  19 ms  19 ms
     4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  19 ms  39 ms  39 ms
     5  ccn-nerif22.Berkeley.EDU (128.32.168.22)  20 ms  39 ms  39 ms
     6  128.32.197.4 (128.32.197.4)  59 ms  119 ms  39 ms
     7  131.119.2.5 (131.119.2.5)  59 ms  59 ms  39 ms
     8  129.140.70.13 (129.140.70.13)  80 ms  79 ms  99 ms
     9  129.140.71.6 (129.140.71.6)  139 ms  139 ms  159 ms
    10  129.140.81.7 (129.140.81.7)  199 ms  180 ms  300 ms
    11  129.140.72.17 (129.140.72.17)  300 ms  239 ms  239 ms
    12  * * *
    13  128.121.54.72 (128.121.54.72)  259 ms  499 ms  279 ms
    14  * * *
    15  * * *
    16  * * *
    17  * * *
    18  ALLSPICE.LCS.MIT.EDU (18.26.0.115)  339 ms  279 ms  279 ms

Note that the gateways 12, 14, 15, 16 & 17 hops away either don't send 
ICMP "time exceeded" messages or send them with a ttl too small to reach us. 
14 - 17 are running the MIT C Gateway code that doesn't send "time exceeded"s. 
God only knows what's going on with 12. 

ちょｗｗｗ God only knowsてｗｗｗｗ