Re: My ISP is routing traffic to private addresses...

[Gary Baribault <gary () baribault net>]

If they use the 10.0.0.0/8 there's no harm, if they use a DOD range or
another 'public' routable range, there is definitely a risk.

Gary B

Gary Baribault
Courriel: gary () baribault net
GPG Key: 0x685430d1
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On 05/17/2013 03:22 PM, Julius Kivimäki wrote:
> Many ISPs do this, usually they hijack DoD ranges. It shouldn't cause
> any issues.
>
>
> 2013/5/17 kyle kemmerer <krkemmerer () gmail com
> <mailto:krkemmerer () gmail com>>
>
>     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
>     <http://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
>     <http://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
>     <http://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
>     <http://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
>     <http://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
>     <http://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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>
>
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