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dup packets

  • From: cache22
  • Date: Mon Mar 15 13:36:39 1999

i reported a problem with packet duplication to the gridnet
(worldcom) noc, and they checked it and they said everything
is fine, some hosts give duplicate echo replies to pings.  i
get either one or three duplicates.  are there any hosts,
routers, firewalls, load balancers, etc. that do this?  i
couldn't find anything in the archives on this subject.

when i tried pinging from locations on other backbones i
didn't receive dups so i feel the problem is within
gridnet.  i am reporting here as i would like to know if any
others are suffering this problem.  also, many hosts and
networks may be receiving unnecessary traffic from duplicate
acks as there is duplication of tcp packets also.

most of the problems are through connections from east to
west coast on atm circuits--see traces below.

other unfriendly behavior--their default route appears to be
pb-nap.eni.net.  most unroutable packets, including reserved
and rfc1918, are routed there--traces below.  this morning,
when g.root-servers.net was unreachable for a few minutes
(via gridnet, did anyone else see it disappear?) i watched
those packets go to eni.  (sorry, didn't capture the
trace.)  are they selling /dev/rj0 service?

this (everything above) has been happening for at least
several months.

matt sommer
sysadmin
webkorner.com  



PING route-server.cerf.net (192.215.254.5): 56 data bytes
64 bytes from 192.215.254.5: icmp_seq=0 ttl=248 time=150.6
ms
64 bytes from 192.215.254.5: icmp_seq=0 ttl=248 time=151.1
ms (DUP!)
64 bytes from 192.215.254.5: icmp_seq=0 ttl=248 time=151.9
ms (DUP!)
64 bytes from 192.215.254.5: icmp_seq=0 ttl=248 time=152.4
ms (DUP!)
64 bytes from 192.215.254.5: icmp_seq=1 ttl=248 time=129.1
ms

--- route-server.cerf.net ping statistics ---
2 packets transmitted, 2 packets received, +3 duplicates, 0%
packet loss
round-trip min/avg/max = 129.1/147.0/152.4 ms

traceroute to route-server.cerf.net (192.215.254.5), 30 hops
max, 40 byte packets
 1  nemo.webkorner.com (207.53.77.1)  3.039 ms  2.013 ms 
1.728 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.749 ms 
19.756 ms  17.061 ms
 3  core-snfx1-atm9-0.2.grid.net (206.80.170.70)  79.949 ms 
81.523 ms  81.564 ms
 4  snfc1.grid.net (198.32.136.48)  79.668 ms  93.924 ms 
79.515 ms
 5  atm8-0-155M.sjc-bb3.cerf.net (134.24.29.38)  97.64 ms 
90.751 ms
f1-0-0.sjc-bb1.cerf.net (134.24.88.55)  106.49 ms
 6  atm0-0-155M.sfo-bb2.cerf.net (134.24.29.21)  114.862 ms
atm8-0-155M.sjc-bb3.cerf.net (134.24.29.38)  101.439 ms
atm0-0-155M.sfo-bb2.cerf.net (134.24.29.21)  105.387 ms
 7  pos0-2-155M.sfo-bb3.cerf.net (134.24.29.197)  93.883 ms 
97.39 ms  97.007 ms
 8  atm10-0-155M.lax-bb1.cerf.net (134.24.29.41)  110.238
ms  113.954 ms  107.834
ms
 9  atm1-0-1-622M.san-bb6.cerf.net (134.24.29.141)  106.82
ms
atm10-0-155M.lax-bb1.cerf.net (134.24.29.41)  190.6 ms
atm1-0-1-622M.san-bb6.cerf.net (134.24.29.141)  135.938 ms
10  pos10-0-0-155M.san-bb2.cerf.net (134.24.29.105)  114.09
ms  100.856 ms
103.303 ms
11  pos1-0-155M.san-hq5.cerf.net (134.24.29.54)  112.1 ms 
118.083 ms  104.277 ms
12  pos1-0-155M.san-hq5.cerf.net (134.24.29.54)  105.645 ms 
106.927 ms  113.921
ms
13  * route-server.cerf.net (192.215.254.5)  122.29 ms *


PING cerf.net (192.102.249.3): 56 data bytes
64 bytes from 192.102.249.3: icmp_seq=0 ttl=247 time=178.2
ms
64 bytes from 192.102.249.3: icmp_seq=0 ttl=247 time=178.9
ms (DUP!)
64 bytes from 192.102.249.3: icmp_seq=0 ttl=247 time=179.2
ms (DUP!)
64 bytes from 192.102.249.3: icmp_seq=0 ttl=247 time=179.7
ms (DUP!)
64 bytes from 192.102.249.3: icmp_seq=1 ttl=247 time=126.5
ms

--- cerf.net ping statistics ---
2 packets transmitted, 2 packets received, +3 duplicates, 0%
packet loss
round-trip min/avg/max = 126.5/168.5/179.7 ms

traceroute to cerf.net (192.102.249.3), 30 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  1.978 ms  1.959 ms 
1.724 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  29.475 ms 
17.064 ms  18.406 ms
 3  core-snfx1-atm9-0.2.grid.net (206.80.170.70)  80.843 ms 
89.331 ms  82.987 ms
 4  snfc1.grid.net (198.32.136.48)  85.938 ms  78.285 ms 
82.579 ms
 5  f0-0-0.sjc-bb2.cerf.net (134.24.88.5)  85.739 ms  88.796
ms  90.437 ms
 6  pos0-0-155M.san-bb6.cerf.net (134.24.29.130)  104.53 ms 
102.469 ms  102.327
ms
 7  pos0-0-155M.san-hq5.cerf.net (134.24.29.113)  102.044 ms
pos0-0-155M.san-bb6.cerf.net (134.24.29.130)  100.354 ms
pos0-0-155M.san-hq5.cerf.net (134.24.29.113)  101.231 ms
 8  pos0-0-155M.san-hq5.cerf.net (134.24.29.113)  103.14 ms 
98.93 ms  100.854 ms
 9  pos9-0-0-155M.san-hq1.cerf.net (134.24.29.126)  108.44
ms  104.816 ms  104.518
ms
10  nic.cerf.net (192.102.249.3)  102.09 ms  110.655 ms 
103.239 ms


PING cisco.com (192.31.7.130): 56 data bytes
64 bytes from 192.31.7.130: icmp_seq=0 ttl=246 time=89.0 ms
64 bytes from 192.31.7.130: icmp_seq=0 ttl=246 time=89.5 ms
(DUP!)
64 bytes from 192.31.7.130: icmp_seq=0 ttl=246 time=90.0 ms
(DUP!)
64 bytes from 192.31.7.130: icmp_seq=0 ttl=246 time=90.5 ms
(DUP!)
64 bytes from 192.31.7.130: icmp_seq=1 ttl=246 time=104.7 ms

--- cisco.com ping statistics ---
2 packets transmitted, 2 packets received, +3 duplicates, 0%
packet loss
round-trip min/avg/max = 89.0/92.7/104.7 ms

traceroute to cisco.com (192.31.7.130), 30 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  1.946 ms  5.717 ms 
2.183 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.692 ms 
25.742 ms  40.845 ms
 3  core-snfx1-atm5-0.4.grid.net (206.80.187.29)  98.354 ms 
85.901 ms  82.039 ms
 4  snfc1.grid.net (198.32.136.48)  79.189 ms  107.082 ms 
79.548 ms
 5  p2-0.sanjose1-nbr1.bbnplanet.net (4.0.3.193)  85.506 ms 
100.916 ms  105.923
ms
 6  p2-0.sanjose1-nbr1.bbnplanet.net (4.0.3.193)  92.522 ms 
96.826 ms  100.667 ms
 7  p4-0.paloalto-nbr2.bbnplanet.net (4.0.1.1)  91.881 ms 
110.78 ms  106.679 ms
 8  h1-0.cisco.bbnplanet.net (131.119.26.10)  95.844 ms 
89.91 ms  89.474 ms
 9  h1-0.cisco.bbnplanet.net (131.119.26.10)  92.13 ms
pigpen.cisco.com
(192.31.7.40)  98.463 ms h1-0.cisco.bbnplanet.net
(131.119.26.10)  114.123 ms
10  cio-sys.cisco.com (192.31.7.130)  97.249 ms
pigpen.cisco.com (192.31.7.40)
99.075 ms  95.722 ms


PING enmu.edu (192.94.216.250): 56 data bytes
64 bytes from 192.94.216.250: icmp_seq=0 ttl=51 time=322.1
ms
64 bytes from 192.94.216.250: icmp_seq=0 ttl=51 time=322.7
ms (DUP!)
64 bytes from 192.94.216.250: icmp_seq=1 ttl=51 time=239.1
ms

--- enmu.edu ping statistics ---
2 packets transmitted, 2 packets received, +1 duplicates, 0%
packet loss
round-trip min/avg/max = 239.1/294.6/322.7 ms

traceroute to enmu.edu (192.94.216.250), 30 hops max, 40
byte packets
 1  nemo.webkorner.com (207.53.77.1)  2.014 ms  1.927 ms 
2.617 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  19.161 ms 
27.238 ms  16.684 ms
 3  core-snfx1-atm5-0.4.grid.net (206.80.187.29)  81.792 ms 
82.091 ms  80.942 ms
 4  t8-0.San-Francisco.t3.ans.net (198.32.128.10)  95.598
ms  83.259 ms  83.83 ms
 5  pacbell-nap.ans.net (198.32.128.67)  110.493 ms  97.621
ms  85.529 ms
 6  h13-1.t16-0.Los-Angeles.t3.ans.net (140.223.9.14) 
106.263 ms  119.991 ms
99.344 ms
 7  h14-1.t112-0.Albuquerque.t3.ans.net (140.223.17.10) 
136.081 ms  120.616 ms
119.887 ms
 8  f0-0.cnss116.Albuquerque.t3.ans.net (140.222.112.196) 
138.032 ms  122.725 ms
125.71 ms
 9  h1-0.enss191.t3.ans.net (192.103.74.42)  126.823 ms 
131.757 ms  130.943 ms
10  198.83.5.4 (198.83.5.4)  158.435 ms  144.432 ms  154.82
ms
11  192.65.78.82 (192.65.78.82)  175.607 ms  160.103 ms 
168.386 ms
12  EM0X.ENMU.EDU (192.94.216.250)  244.882 ms  172.999 ms 
183.95 ms


PING e.root-servers.net (192.203.230.10): 56 data bytes
64 bytes from 192.203.230.10: icmp_seq=0 ttl=251 time=112.5
ms
64 bytes from 192.203.230.10: icmp_seq=0 ttl=251 time=114.3
ms (DUP!)
64 bytes from 192.203.230.10: icmp_seq=1 ttl=251 time=117.3
ms

--- e.root-servers.net ping statistics ---
2 packets transmitted, 2 packets received, +1 duplicates, 0%
packet loss
round-trip min/avg/max = 112.5/114.7/117.3 ms

traceroute to e.root-servers.net (192.203.230.10), 30 hops
max, 40 byte packets
 1  nemo.webkorner.com (207.53.77.1)  2.072 ms  2.964 ms 
1.746 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  17.125 ms 
17.129 ms  16.715 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  81.316 ms 
69.578 ms  81.366 ms
 4  mae-east.nsn.nasa.gov (192.41.177.125)  98.22 ms  87.618
ms  91.117 ms
 5  s-ARC1-ATM.NSN.NASA.GOV (128.161.10.1)  116.303 ms 
112.699 ms  113.355 ms
 6  E.ROOT-SERVERS.NET (192.203.230.10)  123.275 ms * 
111.486 ms


PING l.root-servers.net (198.32.64.12): 56 data bytes
64 bytes from 198.32.64.12: icmp_seq=0 ttl=244 time=174.9 ms
64 bytes from 198.32.64.12: icmp_seq=0 ttl=244 time=175.1 ms
(DUP!)
64 bytes from 198.32.64.12: icmp_seq=1 ttl=244 time=157.6 ms

--- l.root-servers.net ping statistics ---
2 packets transmitted, 2 packets received, +1 duplicates, 0%
packet loss
round-trip min/avg/max = 157.6/169.2/175.1 ms

traceroute to l.root-servers.net (198.32.64.12), 30 hops
max, 40 byte packets
 1  nemo.webkorner.com (207.53.77.1)  3.558 ms  3.419 ms 
1.765 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  18.912 ms 
25.015 ms  17.186 ms
 3  core-wash1-atm8-0.3.grid.net (206.80.180.34)  94.471 ms 
87.77 ms  95.625 ms
 4  * f6.peer1.wdc1.genuity.net (192.41.177.147)  109.531
ms  140.935 ms
 5  h5-0-1.core1.wdc1.genuity.net (207.240.1.233)  136.672
ms *  154.67 ms
 6  * core1.lax1.genuity.net (207.240.0.5)  169.329 ms 
181.559 ms
 7  fe-5-0.peer1.lax1.genuity.net (207.240.1.142)  244.746
ms  164.322 ms  184.965
ms
 8  sandbox.ep.net (198.32.146.11)  168.058 ms  159.353 ms *
 9  * l.root-servers.net (198.32.64.12)  159.825 ms  170.084
ms


PING altavista.com (204.123.2.66): 56 data bytes
64 bytes from 204.123.2.66: icmp_seq=0 ttl=54 time=96.8 ms
64 bytes from 204.123.2.66: icmp_seq=0 ttl=54 time=97.3 ms
(DUP!)
64 bytes from 204.123.2.66: icmp_seq=1 ttl=54 time=99.8 ms

--- altavista.com ping statistics ---
2 packets transmitted, 2 packets received, +1 duplicates, 0%
packet loss
round-trip min/avg/max = 96.8/97.9/99.8 ms

traceroute to altavista.com (204.123.2.69), 30 hops max, 40
byte packets
 1  nemo.webkorner.com (207.53.77.1)  1.96 ms  3.553 ms 
1.782 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.567 ms 
19.488 ms  21.282 ms
 3  peer-atl-uunet-fddi.grid.net (206.80.190.201)  25.164
ms  17.09 ms  61.332 ms
 4  104.ATM2-0.XR1.ATL1.ALTER.NET (146.188.232.50)  18.564
ms  17.982 ms  17.676
ms
 5  295.ATM2-0.TR1.ATL1.ALTER.NET (146.188.232.90)  17.736
ms  86.312 ms  36.625
ms
 6  109.ATM6-0.TR1.SCL1.ALTER.NET (146.188.136.66)  74.736
ms  80.162 ms  83.007
ms
 7  199.ATM7-0.XR1.PAO1.ALTER.NET (146.188.147.117)  75.24
ms  107.525 ms  86.392
ms
 8  189.ATM10-0-0.GW3.PAO1.ALTER.NET (146.188.147.249) 
78.844 ms  81.42 ms  85.98
ms
 9  208.195.253.18 (208.195.253.18)  94.185 ms  81.601 ms 
84.882 ms
10  core-gw1.pa-x.dec.com (204.123.1.1)  81.878 ms  81.915
ms  82.955 ms
11  altavista.com (204.123.2.69)  90.244 ms  86.355 ms 
84.804 ms


***	default route stuff	***


traceroute to 192.168.0.1 (192.168.0.1), 7 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  2.109 ms  1.987 ms 
1.725 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.876 ms 
17.136 ms  16.879 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  80.955 ms 
69.07 ms  84.384 ms
 4  206.80.168.178 (206.80.168.178)  108.509 ms  108.005 ms 
108.684 ms
 5  pb-nap.eni.net (198.32.128.39)  116.592 ms  108.99 ms 
108.275 ms
 6  pb-nap.eni.net (198.32.128.39)  108.28 ms !H * *
 7  * * *


[they blackholed this one, oddly enough]

traceroute to 172.16.0.1 (172.16.0.1), 7 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  1.956 ms  1.996 ms 
1.695 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.623 ms 
17.005 ms  20.315 ms
 3  core-snfc1-hssi11-0.1.grid.net (206.80.180.214)  78.943
ms  76.954 ms  78.453
ms
 4  * * *
 5  * * *
 6  * * *
 7  * * *

traceroute to 172.17.0.1 (172.17.0.1), 7 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  2.184 ms  2.169 ms 
1.69 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  17.204 ms 
17.49 ms  96.326 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  73.894 ms 
80.646 ms  72.661 ms
 4  206.80.168.178 (206.80.168.178)  114.916 ms  111.088 ms 
107.569 ms
 5  pb-nap.eni.net (198.32.128.39)  110.934 ms  109.213 ms 
109.857 ms
 6  * * *
 7  * * *

traceroute to 172.32.0.1 (172.32.0.1), 7 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  2.002 ms  3.351 ms 
1.696 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  17.148 ms 
16.834 ms  18.726 ms
 3  core-wash1-atm8-0.3.grid.net (206.80.180.34)  94.444 ms 
94.4 ms  99.834 ms
 4  206.80.168.178 (206.80.168.178)  140.235 ms  140.247 ms 
137.033 ms
 5  pb-nap.eni.net (198.32.128.39)  127.318 ms  133.545 ms 
124.439 ms
 6  * * *
 7  * * *


traceroute to 10.0.0.1 (10.0.0.1), 7 hops max, 40 byte
packets
 1  nemo.webkorner.com (207.53.77.1)  2.998 ms  1.933 ms 
2.636 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  16.79 ms 
17.42 ms  17.519 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  83.64 ms 
80.487 ms  98.335 ms
 4  206.80.168.178 (206.80.168.178)  126.873 ms  111.404 ms 
110.231 ms
 5  pb-nap.eni.net (198.32.128.39)  127.533 ms  109.746 ms 
111.201 ms
 6  pb-nap.eni.net (198.32.128.39)  114.215 ms !H * *
 7  * * *


traceroute to 1.0.0.1 (1.0.0.1), 7 hops max, 40 byte packets
 1  nemo.webkorner.com (207.53.77.1)  2.053 ms  2.003 ms 
1.685 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  30.512 ms 
17.147 ms  18.741 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  76.457 ms 
89.586 ms  69.123 ms
 4  206.80.168.178 (206.80.168.178)  110.383 ms  117.309 ms 
112.722 ms
 5  pb-nap.eni.net (198.32.128.39)  112.76 ms  112.733 ms 
111.573 ms
 6  * * *
 7  * * *

traceroute to 0.0.0.1 (0.0.0.1), 7 hops max, 40 byte packets
 1  nemo.webkorner.com (207.53.77.1)  2.025 ms  2.825 ms 
1.753 ms
 2  core-atln1-hssi4/0.9.grid.net (207.205.2.1)  20.68 ms 
17.356 ms  20.616 ms
 3  core-wash1-atm4/0.4.grid.net (206.80.188.33)  73.731 ms
core-wash1-atm8-0.3.grid.net (206.80.180.34)  94.608 ms
core-wash1-atm4/0.4.grid.net (206.80.188.33)  68.392 ms
 4  206.80.168.178 (206.80.168.178)  121.929 ms  107.539 ms 
120.781 ms
 5  pb-nap.eni.net (198.32.128.39)  112.065 ms  122.983 ms 
109.885 ms
 6  * * *
 7  pb-nap.eni.net (198.32.128.39)  111.42 ms !H * *





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