internet blocking problem ?

[Paul Koning]

> On Sep 11, 2015, at 11:40 AM, Jay Jaeger <cube1 at charter.net> wrote:
> 
> On 9/10/2015 8:32 PM, Jon Elson wrote:
> 
>> 
>> So, I wonder if I can ask classiccmp members, especially in the US, to
>> check if they can view this page:
>> http://members.iinet.net.au/~daveb/simplex/simplex.html
>> 
>> 
> 
> I cannot make a connection.  My DNS is able to resolve the address.
> 
> ISP is Charter cable, Madison WI (Fitchburg, from the DNS name), then to
> Eau Claire WI, then Chicago, IL where it looks like they apparently peer
> with Cogent.
> 
> As with others, the traceroute stopped at Cogent.  Note that this may
> mean that the next hop after that blocks all of the packets or it could
> mean that the next hop is blocking just the traceroute packets.
> 
> JRJ
> 
> 1  * * *
> 2  dtr01ftbgwi-tge-0-6-0-3.ftbg.wi.charter.com (96.34.25.58)  15.413 ms
> 16.531 ms  16.524 ms
> 3  crr01ftbgwi-bue-4.ftbg.wi.charter.com (96.34.18.108)  23.528 ms
> 21.479 ms  23.501 ms
> 4  crr01euclwi-bue-1.eucl.wi.charter.com (96.34.16.77)  21.431 ms * *
> 5  bbr01euclwi-bue-4.eucl.wi.charter.com (96.34.2.4)  21.157 ms  21.153
> ms  21.318 ms
> 6  bbr02euclwi-bue-5.eucl.wi.charter.com (96.34.0.7)  25.319 ms  16.876
> ms  22.938 ms
> 7  bbr01chcgil-bue-1.chcg.il.charter.com (96.34.0.9)  25.460 ms  26.958
> ms  23.483 ms
> 8  bbr02chcgil-bue-6.chcg.il.charter.com (96.34.0.67)  26.751 ms
> 27.724 ms  27.695 ms
> 9  te0-18-0-2.ccr41.ord03.atlas.cogentco.com (38.122.181.65)  25.728 ms
> 30.118 ms  28.197 ms
> 10  be2216.ccr41.ord01.atlas.cogentco.com (154.54.24.201)  27.315 ms
> 27.427 ms be2217.ccr42.ord01.atlas.cogentco.com (154.54.24.205)  27.389 ms
> 11  be2156.ccr21.mci01.atlas.cogentco.com (154.54.6.85)  41.659 ms
> be2157.ccr22.mci01.atlas.cogentco.com (154.54.6.117)  40.758 ms  38.666 ms
> 12  be2432.ccr21.dfw01.atlas.cogentco.com (154.54.3.133)  47.510 ms
> be2433.ccr22.dfw01.atlas.cogentco.com (154.54.3.213)  53.865 ms
> be2432.ccr21.dfw01.atlas.cogentco.com (154.54.3.133)  52.515 ms
> 13  be2441.ccr21.iah01.atlas.cogentco.com (154.54.41.65)  53.141 ms
> be2443.ccr22.iah01.atlas.cogentco.com (154.54.44.229)  55.853 ms
> be2441.ccr21.iah01.atlas.cogentco.com (154.54.41.65)  55.407 ms
> 14  be2066.ccr22.lax01.atlas.cogentco.com (154.54.7.54)  86.437 ms
> be2065.ccr21.lax01.atlas.cogentco.com (154.54.5.66)  89.222 ms  87.085 ms
> 15  be2017.ccr21.lax04.atlas.cogentco.com (154.54.0.237)  94.160 ms
> be2019.ccr21.lax04.atlas.cogentco.com (154.54.88.10)  90.385 ms  88.573 ms
> 16  * * *
> 17  * * *
> 18  * * *
> 19  * *^C

I saw the same sort of thing but I let traceroute keep running.  The result is that it started giving real answers again just one or two hops later.

Conclusion: hops 16-20ish are blocking traceroute packets.  Later hops aren't.

It's hard to be patient sometimes, but while * * * sometimes indicates "this is as far as you get" it may also indicate just a few nodes that are not cooperating with traceroute on a functional route.

	paul