North American Network Operators Group

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Re: ICMP weirdness

  • From: Alon Tirosh
  • Date: Mon Oct 18 17:21:47 2004
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Comcast uses parts of 10/8 for cable modem addressing, and these are
pingable from within the comcast network. Could this be some other
internal equipment address as well?


On Mon, 18 Oct 2004 17:01:39 -0400, Jim Popovitch <jimpop@yahoo.com> wrote:
> 
> On Mon, 2004-10-18 at 15:54, Stephen J. Wilcox wrote:
> > why not that seems ok to me.. ?
> >
> > assuming you accept the 1918 assignment to your cable then its not unreasonable
> > that you can get to other end users on that network
> 
> Across other non-private IP space?  I am not all that familiar w/
> RFC1918, but I would think that this goes against it, or should I assume
> that Insight Broadband is part of Comcast?
> 
> -Jim P.
> 
> >
> > Steve
> 
> 
> >
> > On Mon, 18 Oct 2004, Jim Popovitch wrote:
> >
> > >
> > > >From Comcast Cable, at my home in Atlanta, I can ping 10.10.1.1....
> > > which is pong'ed from a private client network hanging somewhere off of
> > > Insight Broadband's network in the North Central part of the US.  Why on
> > > god's green earth do network operators allow such nonsense as this?
> > >
> > > -Jim P.
> > >
> > > Traceroute -I 10.10.1.1 produces the following:
> > >
> > > traceroute to 10.10.1.1 (10.10.1.1), 30 hops max, 38 byte packets
> > >  1  10.238.10.1 (10.238.10.1)  29.089 ms  25.387 ms  28.574 ms
> > >  2  66.56.22.66 (66.56.22.66)  30.923 ms  31.305 ms  33.142 ms
> > >  3  66.56.22.70 (66.56.22.70)  35.945 ms  35.874 ms  36.832 ms
> > >  4  c-66-56-23-38.atl.client2.attbi.com (66.56.23.38)  34.740 ms  35.041
> > > ms  37.537 ms
> > >  5  12.118.184.41 (12.118.184.41)  41.967 ms  45.584 ms  43.997 ms
> > >  6  gbr2-p70.attga.ip.att.net (12.123.21.6)  44.988 ms  44.706 ms
> > > 43.033 ms
> > >  7  tbr2-p013602.attga.ip.att.net (12.122.12.37)  49.353 ms  44.010 ms
> > > 45.244 ms
> > >  8  12.122.10.138 (12.122.10.138)  62.244 ms  62.269 ms  62.148 ms
> > >  9  gbr1-p40.sl9mo.ip.att.net (12.122.11.114)  60.922 ms  67.005 ms
> > > 60.264 ms
> > > 10  gar1-p360.sl9mo.ip.att.net (12.123.24.209)  59.572 ms  64.013 ms
> > > 60.198 ms
> > > 11  12-220-0-69.client.insightBB.com (12.220.0.69)  77.000 ms  76.050
> > > ms  77.926 ms
> > > 12  12-220-7-198.client.insightBB.com (12.220.7.198)  95.437 ms  80.068
> > > ms  84.076 ms
> > > 13  10.10.1.1 (10.10.1.1)  93.612 ms  97.280 ms  192.994 ms
> > >
> > >
> > >
> 
>