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Re: Maybe I'm misreading this but...

  • From: Chris Cappuccio
  • Date: Wed Oct 14 18:47:56 1998

On Wed, 14 Oct 1998, Barry Shein wrote:

 | 
 | The following traceroute seems to indicate, according to ARIN, that
 | someone is running routers for spammers in the IANA Reserved netspace?
 | 

You are mis-reading this because the 172 addresses are not routeable.  In a
traceroute, a router can say that it is any IP address it likes, but that
does not mean that you can traceroute to 172.x.y.z...  It just means that the
routers are most likely using those IP addresses for private interconnect

 | First a traceroute:
 | 
 | >world% traceroute www.libidomax.com
 | >traceroute to www.libidomax.com (209.149.111.17), 30 hops max, 40 byte packets
 | > 1  Boston-STD-F.std.com (199.172.62.80)  17 ms  4 ms  4 ms
 | > 2  553.Hssi2-0.GW2.BOS1.ALTER.NET (157.130.10.129)  59 ms  107 ms  69 ms
 | > 3  124.ATM3-0.XR1.BOS1.ALTER.NET (146.188.176.250)  77 ms  54 ms  37 ms
 | > 4  191.ATM2-0.TR1.NYC1.ALTER.NET (146.188.179.82)  38 ms  51 ms  51 ms
 | > 5  104.ATM7-0.TR1.ATL1.ALTER.NET (146.188.136.57)  80 ms  87 ms  133 ms
 | > 6  100.ATM7-0.XR1.ATL1.ALTER.NET (146.188.232.85)  91 ms  141 ms  63 ms
 | > 7  195.ATM10-0-0.GW1.JAX1.ALTER.NET (146.188.232.169)  53 ms  81 ms  107 ms
 | > 8  bs-jackson-gw.customer.alter.net (157.130.65.226)  107 ms  132 ms  96 ms
 | > 9  172.17.80.46 (172.17.80.46)  59 ms  53 ms  44 ms
 | >10  172.21.210.18 (172.21.210.18)  122 ms  96 ms  49 ms
 | >11  209.149.111.17 (209.149.111.17)  53 ms (ttl=118!)  58 ms (ttl=118!)  150 ms (ttl=118!)
 | 
 | 
 | 
 | Ok, now let's look up the 172.* addresses:
 | 
 | >world% arin 172.17.80.46
 | >IANA (IANA-BBLK-RESERVED)
 | >   Internet Assigned Numbers Authority
 | >   Information Sciences Institute
 | >   University of Southern California
 | >   4676 Admiralty Way, Suite 1001
 | >   Marina del Rey, CA 90292-6695
 | >
 | >   Netname: IANA-BBLK-RESERVED
 | >   Netblock: 172.16.0.0 - 172.31.0.0
 | >
 | >   Coordinator:
 | >      Internet Assigned Numbers Authority  (IANA-ARIN)  [email protected]
 | >      (310) 822-1511
 | >
 | >   Domain System inverse mapping provided by:
 | >
 | >   BLACKHOLE.ISI.EDU            128.9.64.26
 | >   NS2.INTERNIC.NET             198.41.0.11
 | 
 | and I get the same result of course for the other 172 address so I'll
 | save you the redundant cut and paste.
 | 
 | What's going on here?
 | 
 | -- 
 |         -Barry Shein
 | 
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