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TB-SUPPORT  May 2013

TB-SUPPORT May 2013

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Subject:

Re: Packets taking the scenic route to CERN

From:

Alastair Dewhurst <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Fri, 3 May 2013 06:51:08 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (259 lines)

Hi

I did a trace route from RAL last night and saw the same issue.  I have checked now and it is normal.  This was on a UI, I didn't check a machine on the OPN subnet.

Alastair

2/5/13
# traceroute www.cern.ch
traceroute to www.cern.ch (137.138.144.168), 30 hops max, 40 byte packets
 1  gw (130.246.180.254)  0.714 ms  1.088 ms  1.477 ms
 2  130.246.0.6 (130.246.0.6)  0.516 ms  0.659 ms  0.794 ms
 3  192.100.78.61 (192.100.78.61)  2.332 ms  2.325 ms  2.807 ms
 4  ae6.read-sbr1.ja.net (146.97.41.157)  3.249 ms  3.232 ms  3.226 ms
 5  ae13.lond-sbr3.ja.net (146.97.33.146)  4.898 ms  5.086 ms  4.878 ms
 6  janet.rt1.lon.uk.geant.net (62.40.124.197)  4.866 ms  4.764 ms  4.647 ms
 7  ae3-vlan110.mx1.lon.uk.geant.net (62.40.98.74)  4.747 ms  4.886 ms  4.973 ms
 8  ae0.mx1.ams.nl.geant.net (62.40.98.81)  11.813 ms  11.448 ms  11.407 ms
 9  ae0.mx1.fra.de.geant.net (62.40.98.128)  18.381 ms  17.583 ms  17.716 ms
10  ae4.rt1.fra.de.geant.net (62.40.98.135)  18.900 ms  17.412 ms  22.400 ms
11  abilene-wash-gw.rt1.fra.de.geant.net (62.40.125.18)  135.625 ms  135.617 ms  135.653 ms
12  ae-2.10.rtr.clev.net.internet2.edu (64.57.28.162)  140.278 ms  140.317 ms  140.408 ms
13  ae-7.10.rtr.chic.net.internet2.edu (64.57.28.158)  152.877 ms  156.432 ms  150.719 ms
14  e513-a-rbrxl-2-te6.cern.ch (192.91.246.126)  248.055 ms  240.901 ms  240.828 ms

3/5/13
# traceroute www.cern.ch
traceroute to www.cern.ch (137.138.144.168), 30 hops max, 40 byte packets
 1  gw (130.246.180.254)  0.730 ms  1.532 ms  1.970 ms
 2  130.246.0.6 (130.246.0.6)  0.310 ms  0.446 ms  0.488 ms
 3  192.100.78.61 (192.100.78.61)  2.271 ms  2.265 ms  2.298 ms
 4  ae6.read-sbr1.ja.net (146.97.41.157)  24.752 ms  24.745 ms  24.736 ms
 5  ae13.lond-sbr3.ja.net (146.97.33.146)  3.751 ms  18.762 ms  18.801 ms
 6  janet.rt1.lon.uk.geant.net (62.40.124.197)  4.459 ms  4.265 ms  4.131 ms
 7  ae3-vlan110.mx1.lon.uk.geant.net (62.40.98.74)  4.078 ms  3.525 ms  3.765 ms
 8  ae0.mx1.par.fr.geant.net (62.40.98.77)  8.852 ms  8.819 ms  8.852 ms
 9  ae4.rt1.par.fr.geant.net (62.40.112.185)  59.005 ms  9.371 ms  58.473 ms
10  switch-bckp-gw.rt1.par.fr.geant.net (62.40.124.82)  17.973 ms  17.966 ms  18.052 ms
11  e513-a-rbrxl-2-te20.cern.ch (192.65.184.70)  21.149 ms  20.655 ms  17.651 ms



On 2 May 2013, at 23:19, Christopher J. Walker wrote:

> On 02/05/13 21:19, Mark Mitchell wrote:
>> Hiya,
>> 
>> I think Chris wins the network vigilance award this week :-)
>> There appears to be an issue with the Geant network.
>> On a serious note, Chris how did you pick this up?
> 
> Someone came into the office and asked was there a problem with the network...
> 
> Further investigation revealed he'd been trying to videoconference to CERN and had poor performance so ended up using the phone bridge.
> 
> The QMUL link to Janet was fine, and whilst pinging CERN didn't have huge packet loss, ping times of 230ms seemed surprisingly long, and traceroute revealed packets looked like they were going across the atlantic.
> 
>> Did any of the experiment software pick up on this?
>> Email from Edoardo is attached below.
> 
> Thanks.
> 
> Chris
> 
> PS Although IPv6 traffic is going to the US, IPv6 traffic isn't.
> 
> [root@nm03 ~]# ping -c 2 www.ipv6.cern.ch
> PING cernis22-21.cern.ch (137.138.218.32) 56(84) bytes of data.
> 64 bytes from cernis22-21.cern.ch (137.138.218.32): icmp_seq=1 ttl=110 time=221 ms
> 64 bytes from cernis22-21.cern.ch (137.138.218.32): icmp_seq=1 ttl=110 time=221 ms (DUP!)
> 64 bytes from cernis22-21.cern.ch (137.138.218.32): icmp_seq=2 ttl=110 time=219 ms
> 
> --- cernis22-21.cern.ch ping statistics ---
> 2 packets transmitted, 2 received, +1 duplicates, 0% packet loss, time 1000ms
> rtt min/avg/max/mdev = 219.561/220.903/221.577/0.948 ms
> [root@nm03 ~]# ping6 -c 2 www.ipv6.cern.ch
> PING www.ipv6.cern.ch(cernis22-21.cern.ch) 56 data bytes
> 64 bytes from cernis22-21.cern.ch: icmp_seq=0 ttl=50 time=28.7 ms
> 64 bytes from cernis22-21.cern.ch: icmp_seq=0 ttl=50 time=28.7 ms (DUP!)
> 64 bytes from cernis22-21.cern.ch: icmp_seq=1 ttl=50 time=16.0 ms
> 64 bytes from cernis22-21.cern.ch: icmp_seq=1 ttl=50 time=16.0 ms (DUP!)
> 
> Traceroute6/tracepath6 don't work to that host - they stop somewhere with no name (no idea if it's inside or outside CERN).
> 
> Chris
> 
>> regards,
>> Mark
>> 
>> -------- Original Message --------
>> Subject: few prefixes from Geant?
>> Date: Thu, 2 May 2013 21:59:23 +0200
>> From: Edoardo Martelli <[log in to unmask]
>> <mailto:[log in to unmask]>>
>> To: NOC Switch <[log in to unmask] <mailto:[log in to unmask]>>, NOC Geant
>> <[log in to unmask] <mailto:[log in to unmask]>>
>> CC: Cern Extip <[log in to unmask] <mailto:[log in to unmask]>>
>> 
>> Hello Geant and SWITCH NOC
>> 
>> We don't get many prefixes from the peerings with SWitch and most of
>> our traffic to the Europen NRENs is going via Internet2.
>> 
>> It seems to me that the prefixes are not even received by Switch.
>> 
>> Is there any issue?
>> 
>> cheers
>> Edoardo
>> 
>> 
>> Router: swiCE2.switch.ch <http://swiCE2.switch.ch/>
>> Command: show ip bgp 62.40.105.162
>> 
>> BGP routing table entry for 62.40.96.0/19, version 23788441
>> Paths: (1 available, no best path)
>> Multipath: eBGP
>> Not advertised to any peer
>> 3356 20965, (received-only)
>> 213.242.73.73 from 213.242.73.73 (4.69.187.34)
>> Origin IGP, metric 0, localpref 100, valid, external
>> Community: 3356:2 3356:22 3356:100 3356:123 3356:501 3356:2065
>> 20965:155
>> 
>> 
>> 
>> On 2 May 2013, at 20:22, John Gordon wrote:
>> 
>>> Mark the workshop is timely, I was about to suggest that this routing
>>> might be a 'benefit ' of LHCONE. We have already seen one instance of
>>> Germany assuming that everyone is on LHCONE.
>>> 
>>> John
>>> 
>>> Mark Mitchell <[log in to unmask]
>>> <mailto:[log in to unmask]>> wrote:
>>> 
>>> 
>>> 
>>> Hi Chris,
>>> Same pattern at Glasgow
>>> I am at the LHCONE workshop so I can ask in the morning as there are
>>> multiple devices from multiple networks on both sides of the Atlantic
>>> doing WAN links and it may be a case of naming conventions? However
>>> given that on one visual trace route it appears to have been sourced
>>> in the US, I am a tad confused.
>>> I will ask the internet 2 guys tomorrow morning.
>>> regards,
>>> Mark
>>> 
>>> traceroute to www.cern.ch <http://www.cern.ch><http://www.cern.ch>
>>> (137.138.144.168), 30 hops max, 40 byte packets
>>> 1 130.209.239.2 (130.209.239.2) 0.452 ms 0.554 ms 0.677 ms
>>> 2 glasgowpop-ge1-2-glasgowuni-ge1-1-v152.clyde.net.uk
>>> <http://glasgowpop-ge1-2-glasgowuni-ge1-1-v152.clyde.net.uk><http://glasgowpop-ge1-2-glasgowuni-ge1-1-v152.clyde.net.uk>
>>> (194.81.62.153) 0.399 ms 0.380 ms 0.413 ms
>>> 3 so-2-0-0.glas-sbr1.ja.net
>>> <http://so-2-0-0.glas-sbr1.ja.net><http://so-2-0-0.glas-sbr1.ja.net>
>>> (146.97.40.97) 0.510 ms 0.562 ms 0.646 ms
>>> 4 ae14.warr-sbr1.ja.net
>>> <http://ae14.warr-sbr1.ja.net><http://ae14.warr-sbr1.ja.net>
>>> (146.97.33.121) 5.207 ms 5.211 ms 5.206 ms
>>> 5 as3.read-sbr1.ja.net
>>> <http://as3.read-sbr1.ja.net><http://as3.read-sbr1.ja.net>
>>> (146.97.33.89) 8.975 ms 8.982 ms 8.978 ms
>>> 6 ae13.lond-sbr3.ja.net
>>> <http://ae13.lond-sbr3.ja.net><http://ae13.lond-sbr3.ja.net>
>>> (146.97.33.146) 10.336 ms 10.327 ms 10.348 ms
>>> 7 janet.rt1.lon.uk.geant.net (62.40.124.197) 66.367 ms 64.430 ms 63.623 ms
>>> 8 ae3-vlan110.mx1.lon.uk.geant.net (62.40.98.74) 10.525 ms 10.528 ms
>>> 10.525 ms
>>> 9 ae0.mx1.ams.nl.geant.net (62.40.98.81) 18.056 ms 18.061 ms 18.055 ms
>>> 10 ae0.mx1.fra.de.geant.net (62.40.98.128) 24.746 ms 24.793 ms 24.762 ms
>>> 11 ae4.rt1.fra.de.geant.net (62.40.98.135) 24.854 ms 24.790 ms 24.894 ms
>>> 12 abilene-wash-gw.rt1.fra.de.geant.net (62.40.125.18) 118.807 ms
>>> 118.923 ms 119.183 ms
>>> 13 ae-2.10.rtr.clev.net.internet2.edu (64.57.28.162) 126.910 ms
>>> 126.890 ms 126.978 ms
>>> 14 ae-7.10.rtr.chic.net.internet2.edu (64.57.28.158) 135.798 ms
>>> 137.945 ms 135.682 ms
>>> 15 e513-a-rbrxl-2-te6.cern.ch
>>> <http://e513-a-rbrxl-2-te6.cern.ch><http://e513-a-rbrxl-2-te6.cern.ch>
>>> (192.91.246.126) 232.462 ms 232.407 ms 232.565 ms
>>> 16 * * *
>>> 17 * * *
>>> 18 * * *
>>> 19 * * *
>>> 20 * * *
>>> 21 * *
>>> On 2 May 2013, at 19:05, Christopher J. Walker wrote:
>>> 
>>> Packets to (and indeed from) CERN seem to be taking the scenic route via
>>> the USA.
>>> 
>>> I'm curious if this is deliberate...
>>> 
>>> walker@heppc046:~$ traceroute www.cern.ch
>>> <http://www.cern.ch><http://www.cern.ch>
>>> traceroute to www.cern.ch <http://www.cern.ch><http://www.cern.ch>
>>> (137.138.144.168), 30 hops max, 60 byte packets
>>> 1 138.37.51.254 (138.37.51.254) 0.239 ms 0.172 ms 0.133 ms
>>> 2 ebr3.witless.core-net.qmul.ac.uk (138.37.3.196) 0.359 ms 0.290 ms
>>> 0.296 ms
>>> 3 Te2-2.lond-bar6.ja.net
>>> <http://Te2-2.lond-bar6.ja.net><http://Te2-2.lond-bar6.ja.net>
>>> (146.97.40.233) 0.684 ms 0.742 ms 0.740 ms
>>> 4 ae2.lond-sbr4.ja.net
>>> <http://ae2.lond-sbr4.ja.net><http://ae2.lond-sbr4.ja.net>
>>> (146.97.35.137) 0.685 ms 0.651 ms 0.639 ms
>>> 5 ae12.read-sbr1.ja.net
>>> <http://ae12.read-sbr1.ja.net><http://ae12.read-sbr1.ja.net>
>>> (146.97.33.141) 2.098 ms 2.159 ms 2.128 ms
>>> 6 ae13.lond-sbr3.ja.net
>>> <http://ae13.lond-sbr3.ja.net><http://ae13.lond-sbr3.ja.net>
>>> (146.97.33.146) 8.198 ms 6.232 ms 6.192 ms
>>> 7 janet.rt1.lon.uk.geant.net (62.40.124.197) 3.783 ms 3.773 ms 3.735 ms
>>> 8 ae3-vlan110.mx1.lon.uk.geant.net (62.40.98.74) 3.728 ms 3.718 ms
>>> 3.722 ms
>>> 9 ae0.mx1.ams.nl.geant.net (62.40.98.81) 11.240 ms 11.293 ms 11.297 ms
>>> 10 ae0.mx1.fra.de.geant.net (62.40.98.128) 18.069 ms 18.058 ms 18.065 ms
>>> 11 ae4.rt1.fra.de.geant.net (62.40.98.135) 18.011 ms 18.035 ms 64.931 ms
>>> 12 abilene-wash-gw.rt1.fra.de.geant.net (62.40.125.18) 113.006 ms
>>> 113.047 ms 112.805 ms
>>> 13 ae-2.10.rtr.clev.net.internet2.edu (64.57.28.162) 120.277 ms
>>> 119.935 ms 119.917 ms
>>> 14 ae-7.10.rtr.chic.net.internet2.edu (64.57.28.158) 135.090 ms
>>> 129.386 ms 129.438 ms
>>> 15 e513-a-rbrxl-2-te6.cern.ch
>>> <http://e513-a-rbrxl-2-te6.cern.ch><http://e513-a-rbrxl-2-te6.cern.ch>
>>> (192.91.246.126) 227.000 ms 222.710 ms
>>> 223.052 ms
>>> 16 * * *
>>> 
>>> --------------------------------------------
>>> Mark Mitchell,
>>> ScotGrid Technical Co-ordinator,
>>> Rm 481,
>>> Kelvin Building,
>>> School of Physics and Astronomy,
>>> University of Glasgow,
>>> G12 8QQ, UK
>>> Telephone: +44-141-330 6439
>>> E Mail: [log in to unmask]
>>> <mailto:[log in to unmask]><mailto:[log in to unmask]>
>>> 
>>> --
>>> Scanned by iCritical.
>> 
>> --------------------------------------------
>> Mark Mitchell,
>> ScotGrid Technical Co-ordinator,
>> Rm 481,
>> Kelvin Building,
>> School of Physics and Astronomy,
>> University of Glasgow,
>> G12 8QQ, UK
>> Telephone: +44-141-330 6439
>> E Mail: [log in to unmask] <mailto:[log in to unmask]>
>> 

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