full-disclosure - My ISP is routing traffic to private addresses...

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Date: Fri, 17 May 2013 15:08:23 -0400
From: kyle kemmerer <krkemmerer@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: My ISP is routing traffic to private addresses...

So today when trying to access a device on my network (172.30.x.x range) I
was taken to the web interface of a completely different device.  This
baffled me at first, but after a bit of poking around, I determined that my
ISP was actually routing traffic to these addresses.  See the trace below

Tracing route to 172.30.4.18 over a maximum of 30 hops

  1    11 ms    18 ms    19 ms  XXXXXXXXX
  2    30 ms   178 ms   212 ms  vl4.aggr1.phdl.pa.rcn.net [208.59.252.1]
  3    13 ms    18 ms    13 ms  tge0-1-0-0.core1.phdl.pa.rcn.net[207.172.15.50]

  4    37 ms    39 ms    57 ms  tge0-0-0-2.core1.lnh.md.rcn.net[207.172.19.227]

  5    35 ms    34 ms    32 ms  tge0-1-0-1.core1.chgo.il.rcn.net[207.172.19.235
]
  6    42 ms    38 ms    39 ms  port-chan13.aggr2.chgo.il.rcn.net[207.172.15.20
1]
  7    37 ms    39 ms    39 ms
port-chan1.mart-ubr1.chi-mart.il.cable.rcn.net [
207.229.191.132]
  8    57 ms    61 ms    53 ms  172.30.4.18

Trace complete.

So I break out nmap and do a quick scan, and find that there are thousands
of these devices across this IP range.  Has anybody ever seen anything like
this?  Surely this must be a mistake, right? If anybody else is using RCN
as an ISP, can you access these addresses as well?

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