ru.unix.bsd

 
 - RU.UNIX.BSD ------------------------------------------------------------------
 From : Eugene Grosbein                      2:5006/1       06 Jan 2006  12:33:31
 To : All
 Subject : прикол с yandex
 -------------------------------------------------------------------------------- 
 

 # traceroute -P icmp www.yandex.ru
 traceroute to www.yandex.ru (213.180.204.11), 64 hops max, 64 byte packets
  1  gw3.svzserv.kuzbass.ru (213.184.64.134)  0.690 ms  1.171 ms  0.579 ms
  2  gw-rdtc.rdtc.ru (62.231.162.134)  1.932 ms  2.002 ms  2.831 ms
  3  74-e.ngts.rdtc.ru (62.231.160.182)  1.423 ms  1.112 ms  1.088 ms
  4  ge0-1-203.ll-nkz.zsttk.ru (82.200.27.41)  52.774 ms  1.173 ms  2.142 ms
  5  NSK13-F10.119-0.transtelecom.net (217.150.39.162)  9.835 ms  10.448 ms 
 8.738 ms
  6  MSK41.TRANSTELECOM.NET (193.232.244.211)  50.630 ms  50.768 ms  50.062 ms
  7  ix2-m9.yandex.net (193.232.244.93)  50.542 ms  53.125 ms  50.313 ms
  8  ix1-vlan4.yandex.net (213.180.210.145)  54.972 ms  52.716 ms  53.571 ms
  9  * * *
 10  * * *
 11  * * *
 12  * * *
 13  * * *
 14  * * *
 15  yandex.ru (213.180.204.11)  51.708 ms !  51.849 ms !  51.987 ms !
 
 Вызываем man traceroute, делаем поиск восклицательного знака:
 /\!
 
 В параграфе ниже написано:
 
        Notice that there are 12 "gateways" (13 is the final  destination)  and
        exactly  the  last half of them are "missing".  What's really happening
        is that rip (a Sun-3 running Sun OS3.5)  is  using  the  ttl  from  our
        arriving  datagram  as  the  ttl in its ICMP reply.  So, the reply will
        time out on the return path (with no notice sent to anyone since ICMP's
        aren't sent for ICMP's) until we probe with a ttl that's at least twice
        the path length.  I.e., rip is really only 7 hops away.  A  reply  that
        returns  with  a  ttl  of  1 is a clue this problem exists.  Traceroute
        prints a "!" after the time if the ttl is <= 1.  Since vendors  ship  a
        lot  of  obsolete  (DEC's Ultrix, Sun 3.x) or non-standard (HPUX) soft-
        ware, expect to see this problem frequently and/or  take  care  picking
        the target host of your probes.
 
 Интересно, в каком году написан этот параграф и что за хрень
 работает стеком TCP/IP на yandex.ru?
 
 Eugene
 -- 
 Как ни отмывай задний проход, он не станет глазом. (Дхарма)
 --- slrn/0.9.8.0 (FreeBSD)
  * Origin: Svyaz Service JSC (2:5006/1@fidonet)
 
 

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