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Regards
Marshall Eubanks

NORMAL
multicasttech-2>trace 200.13.39.1

Type escape sequence to abort.
Tracing the route to 200.13.39.1

  1 207.ATM1-0.GW2.DCA8.ALTER.NET (157.130.46.53) 4 msec 4 msec 4 msec
  2 0.so-3-0-0.XL2.DCA8.ALTER.NET (146.188.162.194) [AS 701] 8 msec 4 msec 24
msec
  3 0.so-3-0-0.TR2.DCA8.ALTER.NET (152.63.144.29) [AS 701] 4 msec 4 msec 4 msec

  4 115.at-6-0-0.TR2.HOU7.ALTER.NET (146.188.141.142) [AS 701] 64 msec 56 msec
60 msec
  5 186.at-1-0-0.XR2.HOU7.ALTER.NET (152.63.97.233) [AS 701] 60 msec 52 msec
56 msec
  6 182.ATM5-0.GW4.HOU7.ALTER.NET (152.63.100.133) [AS 701] 60 msec 56 msec
60 msec
  7 avental-gw.customer.ALTER.NET (157.130.133.206) [AS 701] 72 msec 72 msec
72 msec
  8 200.33.208.206 [AS 6503] 100 msec 84 msec 92 msec
  9 ar6.mexmdf.avantel.net.mx (200.33.209.29) [AS 6503] 92 msec 100 msec 88
msec
 10 na-62-239.na.avantel.net.mx (200.39.239.62) [AS 6503] 112 msec 96 msec 88
msec
 11 200.13.38.129 [AS 3561] 144 msec 136 msec 128 msec
multicasttech-2>show ip bgp 200.13.39.1
BGP routing table entry for 200.13.39.0/24, version 155431
Paths: (2 available, best #1, table Default-IP-Routing-Table)
  Advertised to non peer-group peers:
  192.168.1.2 
  701 6503
    157.130.46.53 from 157.130.46.53 (137.39.4.99)
      Origin IGP, localpref 100, valid, external, best
  1239 1239 1239 5511
    160.81.38.225 from 160.81.38.225 (144.228.242.54)
      Origin IGP, metric 48, localpref 100, valid, external

NOT NORMAL
multicasttech-2>trace 198.146.21.26

Type escape sequence to abort.
Tracing the route to 198.146.21.26

  1 207.ATM1-0.GW2.DCA8.ALTER.NET (157.130.46.53) 4 msec 12 msec 4 msec
  2 0.so-3-0-0.XL1.DCA8.ALTER.NET (146.188.162.198) [AS 701] 4 msec 8 msec 8
msec
  3 189.at-1-0-0.XR1.DCA6.ALTER.NET (152.63.33.77) [AS 701] 4 msec 8 msec 24
msec
  4 0.so-2-1-0.XL1.DCA6.ALTER.NET (152.63.38.85) [AS 701] 8 msec 8 msec 8 msec

  5 POS6-0.BR4.DCA6.ALTER.NET (152.63.41.229) [AS 701] 32 msec 12 msec 4 msec

  6 204.255.169.98 [AS 701] 8 msec 8 msec 8 msec
  7 wdc-core-01.inet.qwest.net (205.171.24.37) [AS 209] 8 msec 8 msec 4 msec

  8 dca-core-02.inet.qwest.net (205.171.8.209) [AS 209] 4 msec 8 msec 8 msec

  9 atl-core-02.inet.qwest.net (205.171.8.153) [AS 209] 28 msec 24 msec 24 msec

 10 atl-edge-05.inet.qwest.net (205.171.21.54) [AS 209] 44 msec 24 msec 28 msec

 11 63.144.0.110 [AS 209] 36 msec 40 msec 32 msec
 12  *  *  * 
 13 208.63.129.1 [AS 19956] 32 msec 32 msec 32 msec
 14 208.63.129.3 [AS 19956] 56 msec *  32 msec
 15 208.63.129.1 [AS 19956] 36 msec 36 msec 32 msec
 16  * 
    208.63.129.3 [AS 19956] 32 msec * 
 17 208.63.129.1 [AS 19956] 32 msec 100 msec 96 msec
 18  * 
    208.63.129.3 [AS 19956] 36 msec * 
 19 208.63.129.1 [AS 19956] 36 msec 32 msec 32 msec
 20 208.63.129.3 [AS 19956] 32 msec *  32 msec
 21 208.63.129.1 [AS 19956] 32 msec 36 msec 44 msec
 22  *  * 
    208.63.129.3 [AS 19956] 40 msec
 23 208.63.129.1 [AS 19956] 32 msec 40 msec 32 msec
 24  * 
    208.63.129.3 [AS 19956] 32 msec * 
 25 208.63.129.1 [AS 19956] 36 msec 36 msec 40 msec
 26 208.63.129.3 [AS 19956] 32 msec *  32 msec
 27 208.63.129.1 [AS 19956] 32 msec 36 msec 40 msec
 28  * 
    208.63.129.3 [AS 19956] 36 msec * 
 29 208.63.129.1 [AS 19956] 36 msec 36 msec 52 msec
 30  *  *  * 
multicasttech-2>show ip  bgp 198.146.21.26
BGP routing table entry for 198.146.21.0/24, version 696388
Paths: (2 available, best #1, table Default-IP-Routing-Table)
  Advertised to non peer-group peers:
  192.168.1.2 
  701 209 19956 16473
    157.130.46.53 from 157.130.46.53 (137.39.4.99)
      Origin incomplete, localpref 100, valid, external, best
  1239 1239 1239 209 19956 16473
    160.81.38.225 from 160.81.38.225 (144.228.242.54)
      Origin incomplete, metric 8, localpref 100, valid, external
multicasttech-2>
multicasttech-2>ping 198.146.21.26

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.146.21.26, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
multicasttech-2>


the most interesting thing is that the rtt increases.. 

and it does so by regular amounts, about 30ms in each hop

i'd guess there is a routing loop going on there for sure, i'd also guess
its between two routers that are 30ms apart!

perhaps it could be being caused by some sort of nat on the router so
there are actually two routers looping but one or both of the addresses
get nat'd as the replies come to you

Steve

On Tue, 18 Sep 2001, Ratul Mahajan wrote:




while playing around with traceroutes for a measurement study of bgp, i
often come across the traceroute outputs similar to those appended below.
 
i don't have a reasonable explanation of such behaviour (i don't think
these are routing loops; they are not transient in any case). i am hoping

someone on the list has a hang of traceroute implementations, and provide

insights into under what circumstances this might happen.

     thanks,
     -- ratul

--------------

$ traceroute 200.13.39.1
traceroute to 200.13.39.1 (200.13.39.1), 30 hops max, 38 byte packets
 1  regina-GE1-2.cac.washington.edu (128.95.219.100)  1.098 ms  1.233 ms
 
 2  uwbr2-GE3-0.cac.washington.edu (140.142.153.24)  0.349 ms  0.377 ms 

 3  cnsp1-wes-GE1-0.pnw-gigapop.net (198.107.150.1)  1.561 ms  1.005 ms 

 4  so-1-2-2.a07.sttlwa01.us.ra.verio.net (204.203.3.1)  21.690 ms  6.076

 5  ge-6-2-0.r03.sttlwa01.us.bb.verio.net (129.250.28.1)  8.481 ms  8.756

 6  p4-7-2-0.r06.plalca01.us.bb.verio.net (129.250.3.138)  29.934 ms  
 7  p16-3-0-0.r00.plalca01.us.bb.verio.net (129.250.2.162)  26.740 ms  
 8  p4-0.francetelecom.plalca01.us.bb.verio.net (129.250.9.134)  23.058 ms
 
 9  P4-3.DALBB1.Dallas.opentransit.net (193.251.132.221)  84.523 ms  
10  P5-1.FWHBB2.Fort-worth.opentransit.net (193.251.132.213)  86.653 ms 

11  Sr9-0-0.FWHAR1.Fort-worth.opentransit.net (193.251.132.227)  88.507 ms
 
12  193.251.133.117 (193.251.133.117)  115.472 ms *  116.554 ms
13  193.251.133.117 (193.251.133.117)  145.386 ms  147.224 ms  148.333 ms

14  193.251.133.117 (193.251.133.117)  178.751 ms  172.224 ms *
15  193.251.133.117 (193.251.133.117)  208.640 ms  203.841 ms  199.946 ms

16  193.251.133.117 (193.251.133.117)  231.618 ms  233.234 ms  229.844 ms

17  193.251.133.117 (193.251.133.117)  259.227 ms  258.488 ms  262.034 ms

18  193.251.133.117 (193.251.133.117)  288.661 ms  292.598 ms  288.129 ms

19  193.251.133.117 (193.251.133.117)  321.982 ms  320.806 ms  318.364 ms

20  193.251.133.117 (193.251.133.117)  350.245 ms  349.834 ms  540.883 ms

21  193.251.133.117 (193.251.133.117)  539.971 ms  410.838 ms  419.743 ms

22  193.251.133.117 (193.251.133.117)  468.291 ms  409.761 ms  406.256 ms

23  193.251.133.117 (193.251.133.117)  432.990 ms  439.589 ms  434.184 ms

24  * 193.251.133.117 (193.251.133.117)  466.399 ms  465.287 ms
25  193.251.133.117 (193.251.133.117)  500.719 ms  498.601 ms  499.957 ms

26  193.251.133.117 (193.251.133.117)  530.089 ms  527.642 ms  528.999 ms

27  193.251.133.117 (193.251.133.117)  556.208 ms  555.552 ms  557.387 ms

28  193.251.133.117 (193.251.133.117)  586.776 ms  584.171 ms  586.944 ms

29  193.251.133.117 (193.251.133.117)  608.677 ms  610.789 ms  618.232 ms

30  193.251.133.117 (193.251.133.117)  641.141 ms  643.149 ms  639.050 ms


----------

$ traceroute 198.146.21.26
traceroute to 198.146.21.26 (198.146.21.26), 30 hops max, 38 byte packets

 1  regina-GE1-2.cac.washington.edu (128.95.219.100)  4.395 ms  0.986 ms
 
 2  uwbr2-GE2-0.cac.washington.edu (140.142.155.24)  0.326 ms  0.310 ms 

 3  cnsp1-wes-GE1-0.pnw-gigapop.net (198.107.150.1)  1.305 ms  1.113 ms 

 4  so-1-2-2.a07.sttlwa01.us.ra.verio.net (204.203.3.1)  4.219 ms  4.308

 5  ge-6-2-0.r03.sttlwa01.us.bb.verio.net (129.250.28.1)  4.096 ms  6.462

 6  p4-5-0-0.r06.plalca01.us.bb.verio.net (129.250.3.89)  25.469 ms  
 7  p4-0-0.r05.plalca01.us.bb.verio.net (129.250.2.129)  23.593 ms  22.371

 8  svl-brdr-01.inet.qwest.net (205.171.4.45)  24.093 ms  25.967 ms  
 9  svl-core-03.inet.qwest.net (205.171.14.109)  27.487 ms  22.669 ms  
10  svl-core-01.inet.qwest.net (205.171.14.121)  22.500 ms  24.719 ms  
11  chi-core-03.inet.qwest.net (205.171.8.50)  62.208 ms  55.153 ms  
12  chi-core-01.inet.qwest.net (205.171.20.173)  57.742 ms  54.672 ms  
13  chi-edge-01.inet.qwest.net (205.171.20.34)  54.261 ms  58.971 ms  
14  208.46.63.202 (208.46.63.202)  88.583 ms  69.619 ms  67.605 ms
15  208.63.128.3 (208.63.128.3)  70.551 ms  67.581 ms  69.375 ms
16  208.63.128.1 (208.63.128.1)  65.115 ms  70.951 ms  66.083 ms
17  208.63.128.3 (208.63.128.3)  67.628 ms  65.488 ms  68.418 ms
18  208.63.128.1 (208.63.128.1)  72.197 ms  71.422 ms  69.517 ms
19  208.63.128.3 (208.63.128.3)  68.539 ms  68.976 ms  67.911 ms
20  208.63.128.1 (208.63.128.1)  72.373 ms  67.838 ms  66.468 ms
21  208.63.128.3 (208.63.128.3)  67.040 ms  69.136 ms  67.631 ms
22  208.63.128.1 (208.63.128.1)  66.317 ms  83.947 ms  70.693 ms
23  208.63.128.3 (208.63.128.3)  66.865 ms  69.521 ms  69.760 ms
24  208.63.128.1 (208.63.128.1)  69.604 ms  67.534 ms  70.447 ms
25  208.63.128.3 (208.63.128.3)  68.285 ms  69.772 ms  67.721 ms
26  208.63.128.1 (208.63.128.1)  71.915 ms  69.530 ms  72.403 ms
27  208.63.128.3 (208.63.128.3)  111.475 ms  69.670 ms  69.267 ms
28  208.63.128.1 (208.63.128.1)  68.883 ms  67.147 ms  72.106 ms
29  208.63.128.3 (208.63.128.3)  69.842 ms  67.889 ms  66.944 ms
30  208.63.128.1 (208.63.128.1)  70.986 ms  73.124 ms  68.452 ms





-- 
Stephen J. Wilcox
IP Services Manager, Opal Telecom
http://www.opaltelecom.co.uk/
Tel: 0161 222 2000
Fax: 0161 222 2008



Marshall Eubanks

tme () 21rst-century com


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