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

[Gary Baribault <gary () baribault net>]

I'm with a largish cable provider in Quebec, and they use the 10.x.x.x
network throughout theirs, but if you're trying to access a 172.30
device inside your private home or work network why is that traffic
escaping to your ISP? If you're trying to access 172.30.x.x devices over
the Internet, it's not supposed to work.

$ traceroute -n www.videotron.com
traceroute to www.videotron.com (24.201.243.21), 30 hops max, 60 byte
packets
 1  192.168.0.2  0.137 ms  0.064 ms  0.071 ms
 2  * * *
 3  10.170.169.49  16.351 ms  17.245 ms  17.185 ms
 4  10.170.162.214  12.740 ms  13.593 ms  13.539 ms
 5  10.170.167.14  24.527 ms  25.335 ms  25.282 ms
 6  10.170.177.165  18.039 ms  18.904 ms  18.833 ms
 7  10.170.163.177  14.135 ms  9.233 ms  12.787 ms
 8  10.170.163.182  13.678 ms  12.584 ms  11.337 ms

etc...

If I was using 10.x.x.x then I would route the traffic inside, I use
192.168.0.x at home, so 10 would leak to the net, but that's RFC'd not
to work.

Gary Baribault

On 05/17/2013 03:08 PM, kyle kemmerer wrote:
> 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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