two questions - SWAG answers entertained

Fri Oct 5 15:27:36 UTC 2007

On Oct 5, 2007, at 11:10 AM, Valdis.Kletnieks at vt.edu wrote:

> On Thu, 04 Oct 2007 13:01:19 EDT, Marshall Eubanks said:
>
>> ## hop_histogram
>> # hop_histogram   1      1    968  2.78565e+07
>> # hop_histogram   2   1587  32780  7.74648e+08
>> # hop_histogram   3  12829 122320  1.06436e+09
>> # hop_histogram   4   8754  56473  2.98075e+08
>> # hop_histogram   5   2549  14877  4.19192e+07
>> # hop_histogram   6    432   1932  1.18231e+07
>> # hop_histogram   7     39    215  872786
>> # hop_histogram   8      6     32  50112
>> # hop_histogram   9      0      0  0
>> # hop_histogram  10      0      0  0
>> # hop_histogram  11      0      0  0
>> # hop_histogram  12      0      0  0
>> # hop_histogram  13      0      0  0
>> # hop_histogram  14      1      1  4094
>
> Are you able to share the identity/AS path of that outlier at 14,  
> or at least
> explain how somebody got a path length of 14 without any paths of  
> lengths 9
> through 13 showing up?

Yes -
Here it is :

  AS   3010  SPRINT-MRN-BLOCK                |    1 prefixes |    1  
prefixes &    1 ASN supported |     4094 Addresses |  14 hops | as  
path   174  3491 18734 28509  3001  3002  3003  3004  3005  3006   
3007  3008  3009  3010

here is the only address block :

*> 201.160.16.0/20  38.101.161.116        4001             0 174 3491  
18734 28509 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 i

I assume that this is some odd internal Sprint thing - maybe a lab in  
Mexico as it is going through 28509 ?

   28509         MX-TCSC23-LACNIC                [RUM]                 
{62270 - cuernavaca - MO, MX} TV Cable S.A. de C.V.

None of the other 3001-3009 appear directly.

Could this be some new form of AS path prepending ? I really don't know.

Regards
Marshall