QMUL can now pass jumbo packets to Janet. The motivation behind asking
for this capability is that the proposal seems to be that LHCONE is
proposed to work at this MTU. While QMUL's 10Gbit link was being
commissioned it seemed sensible to ask for this.
I've done some tests on this - in particular to see whether path MTU
discovery worked. For a number of sites, it doesn't.
Perhaps I should do a lightning talk at hepsysman on this. Is there
interest?
To test this, I ran tracepath from machines connected at MTUs of 1500
and 9000. Here's the summary of whether path MTU discovery works:
1500 9000 Host
Y Y perfsonar-ps01.gridpp.rl.ac.uk
N N dc2-grid-ps-00.brunel.ac.uk
Y N netmon00.grid.hep.ph.ic.ac.uk
Y N perfson1.ppgrid1.rhul.ac.uk
Y Y pygrid-sonar1.lancs.ac.uk
Y Y hepsonar1.ph.liv.ac.uk
Y Y sv220317.tier2.hep.manchester.ac.uk
Y Y lcgperf.shef.ac.uk
Y Y perfmon.dur.scotgrid.ac.uk
Y Y gridpp-ps-band.ecdf.ed.ac.uk
N N ps001.gla.scotgrid.ac.uk
Y Y epgperf.ph.bham.ac.uk
Y Y serv04.hep.phy.cam.ac.uk
Y Y t2ps-bandwidth.physics.ox.ac.uk
Y Y heplnx130.pp.rl.ac.uk
Most sites correctly report an MTU of 1500. Imperial and RHUL work with
1500 byte packets, but fail when 9000 byte packets are used (oops).
Glasgow and Brunel fail with both - however in both cases, 1500 byte
packets get further (indicating multiple problems).
I've discussed this with Simon Fayer at Imperial - and AIUI, the network
team have escalated this to Janet (noting that RHUL also looks like it
has the same problem in the same place.
I suspect that Glasgow and Brunel should raise this with their network
team.
Here are the raw results:
[root@nm03 ~]# for host in $(cat ukhosts); do echo $host ; tracepath
$host ; done
perfsonar-ps01.gridpp.rl.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.050ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.186ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.176ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.791ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
2.043ms
5: ae2.read-sbr1.ja.net (146.97.35.149) 59.246ms pmtu
1500
6: 192.100.78.17 (192.100.78.17) 2.634ms
7: perfsonar-ps01.gridpp.rl.ac.uk (130.246.179.196) 2.186ms reached
Resume: pmtu 1500 hops 7 back 7
dc2-grid-ps-00.brunel.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.058ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.134ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.235ms
3: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) asymm 2
1.083ms pmtu 1500
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
netmon00.grid.hep.ph.ic.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.048ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.159ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.978ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.827ms
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 9000
Resume: pmtu 9000
perfson1.ppgrid1.rhul.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.042ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.160ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.190ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.909ms
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 9000
Resume: pmtu 9000
pygrid-sonar1.lancs.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.040ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.152ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.221ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.762ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.979ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.849ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.741ms
7: ae14.glas-sbr1.ja.net (146.97.33.122) 10.673ms pmtu
4470
8: carlisle-lancaster.canlman.net.uk (194.81.46.34) 10.754ms pmtu
1500
9: famx-vr-hec.rtr.lancs.ac.uk (148.88.255.185) 16.186ms
10: is-vr-hec.rtr.lancs.ac.uk (148.88.255.193) 15.915ms
11: no reply
12: pygrid-sonar1.lancs.ac.uk (194.80.35.59) asymm 11
15.858ms !H
Resume: pmtu 1500
hepsonar1.ph.liv.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.036ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.198ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.287ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.837ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
61.810ms
5: as3.leed-sbr1.ja.net (146.97.33.97) 5.317ms pmtu
1500
6: gw-liv-bh.netnw.net.uk (194.66.27.54) 7.497ms
7: gw-119-1.liv.ac.uk (138.253.119.1) 7.927ms
8: no reply
9: hepsonar1.ph.liv.ac.uk (138.253.178.176) 8.467ms reached
Resume: pmtu 1500 hops 9 back 9
sv220317.tier2.hep.manchester.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.052ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.147ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.974ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.834ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.334ms
5: as3.leed-sbr1.ja.net (146.97.33.97) 70.084ms pmtu
1500
6: no reply
7: sv220317.tier2.hep.manchester.ac.uk (195.194.105.106) 6.337ms reached
Resume: pmtu 1500 hops 7 back 7
lcgperf.shef.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.056ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.141ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.969ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.839ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.267ms
5: as3.leed-sbr1.ja.net (146.97.33.97) 5.905ms pmtu
4470
6: YHMAN-L1.site.ja.net (146.97.42.26) asymm 5
5.706ms pmtu 1500
7: cpop1.shffu.yhman.net.uk (195.195.130.34) 20.891ms
8: no reply
9: no reply
10: lcgperf.shef.ac.uk (143.167.3.116) 7.090ms !H
Resume: pmtu 1500
perfmon.dur.scotgrid.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.052ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.201ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.072ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.794ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.976ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.888ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.702ms
7: ae14.glas-sbr1.ja.net (146.97.33.122) 10.665ms pmtu
4470
8: norman.glas-sbr1.ja.net (146.97.40.106) asymm 7
14.875ms pmtu 1530
9: dur-rtr1-ten-1-1.norman.ja.net (194.81.4.254) asymm 8
15.072ms pmtu 1500
10: no reply
11: no reply
12: no reply
13: perfmon.dur.scotgrid.ac.uk (129.234.193.3) 21.797ms reached
Resume: pmtu 1500 hops 13 back 13
gridpp-ps-band.ecdf.ed.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.047ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.241ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.958ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.849ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.347ms
5: as3.leed-sbr1.ja.net (146.97.33.97) 5.321ms pmtu
4470
6: EastMAN-E1.site.ja.net (146.97.42.46) asymm 5
11.411ms pmtu 1500
7: vlan688.srif-kb1.net.ed.ac.uk (129.215.255.242) asymm 8
11.333ms
8: vlan674.acf1.net.ed.ac.uk (129.215.255.238) asymm 9
11.147ms
9: vlan674.acf1.net.ed.ac.uk (129.215.255.238) 11.204ms !H
Resume: pmtu 1500
ps001.gla.scotgrid.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.035ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.158ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.179ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.578ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.982ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.727ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.663ms
7: ae14.glas-sbr1.ja.net (146.97.33.122) 10.929ms pmtu
4470
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 4470
Resume: pmtu 4470
epgperf.ph.bham.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.063ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.155ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.173ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.815ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
2.042ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.751ms
6: po1.birm-rbr1.ja.net (146.97.35.158) 7.843ms
7: po1.birm-rbr1.ja.net (146.97.35.158) asymm 6
7.832ms pmtu 1500
8: epgperf.ph.bham.ac.uk (193.62.56.9) 7.446ms reached
Resume: pmtu 1500 hops 8 back 8
serv04.hep.phy.cam.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.049ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.153ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.211ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
1.176ms
4: ae1.chel-rbr3.ja.net (146.97.35.122) asymm 5
30.700ms
5: camb-rbr1.eastern.ja.net (146.97.65.49) asymm 6
4.032ms
6: camb-rbr1.eastern.ja.net (146.97.65.49) 4.030ms pmtu
1500
7: route-enet.route-mill.net.cam.ac.uk (192.84.5.93) 4.000ms
8: route-mill.route-nwest.net.cam.ac.uk (192.84.5.138) 4.359ms
9: serv04.hep.phy.cam.ac.uk (131.111.66.196) 4.330ms reached
Resume: pmtu 1500 hops 9 back 9
t2ps-bandwidth.physics.ox.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.050ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.139ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.020ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.860ms
4: ae0-0.read-rbr3.ja.net (146.97.35.66) asymm 5
2.071ms
5: xe-1-0-0.oxfo-rbr3.ja.net (193.63.108.138) asymm 6
3.045ms
6: xe-2-0-0.oxfo-rbr2.ja.net (193.63.108.142) asymm 7
3.183ms
7: xe-2-0-0.oxfo-rbr2.ja.net (193.63.108.142) 11.065ms pmtu
1500
8: coucs1b.backbone.ox.ac.uk (192.76.21.1) 3.287ms
9: t2ps-bandwidth.physics.ox.ac.uk (163.1.5.211) 3.189ms reached
Resume: pmtu 1500 hops 9 back 9
heplnx130.pp.rl.ac.uk
1: nm03.esc.qmul.ac.uk (194.36.10.39) 0.042ms pmtu
9000
1: 194.36.10.254 (194.36.10.254) 0.144ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.039ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.485ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
2.056ms
5: ae2.read-sbr1.ja.net (146.97.35.149) 1.970ms pmtu
1500
6: no reply
7: heplnx130.pp.rl.ac.uk (130.246.47.130) 2.132ms !H
Resume: pmtu 1500
################## Now try at 1500 ###########################
[root@perfsonar-latency ~]# for host in $(cat ukhosts ); do echo $host ;
tracepath $host ; done
perfsonar-ps01.gridpp.rl.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.059ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.088ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.886ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.552ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.774ms
5: ral-1.site.ja.net (146.97.41.158) 2.512ms
6: 192.100.78.17 (192.100.78.17) 2.664ms
7: perfsonar-ps01.gridpp.rl.ac.uk (130.246.179.196) 2.244ms reached
Resume: pmtu 1500 hops 7 back 7
dc2-grid-ps-00.brunel.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.052ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.092ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.796ms
3: brunel-university.ja.net (146.97.137.110) 0.891ms
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
netmon00.grid.hep.ph.ic.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.057ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.097ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.304ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.517ms
4: imperial-college.ja.net (146.97.137.154) 0.884ms
5: netmon00.grid.hep.ph.ic.ac.uk (146.179.247.74) 0.697ms !H
Resume: pmtu 1500
perfson1.ppgrid1.rhul.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.044ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.084ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 1.372ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 0.995ms
4: royal-holloway-physics-2.ja.net (146.97.138.234) 2.418ms
5: no reply
6: perfson1.ppgrid1.rhul.ac.uk (134.219.225.13) asymm 7
2.312ms reached
Resume: pmtu 1500 hops 6 back 7
pygrid-sonar1.lancs.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.059ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.092ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.930ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.592ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.690ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.579ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.376ms
7: ClydeNET-G1.site.ja.net (146.97.41.250) asymm 8
33.458ms
8: lancs-bar2-canlman-carlisle.canlman.net.uk (194.81.46.26) 10.970ms
9: famx-vr-hec.rtr.lancs.ac.uk (148.88.255.185) 15.289ms
10: is-vr-hec.rtr.lancs.ac.uk (148.88.255.193) 15.669ms
11: no reply
12: pygrid-sonar1.lancs.ac.uk (194.80.35.59) asymm 11
15.736ms !H
Resume: pmtu 1500
hepsonar1.ph.liv.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.052ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.092ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.881ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.635ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.102ms
5: nnw.leed-sbr1.ja.net (146.97.40.242) 6.460ms
6: gw-liv-bh.netnw.net.uk (194.66.27.54) 7.568ms
7: gw-119-1.liv.ac.uk (138.253.119.1) 17.861ms
8: no reply
9: hepsonar1.ph.liv.ac.uk (138.253.178.176) 8.317ms reached
Resume: pmtu 1500 hops 9 back 9
sv220317.tier2.hep.manchester.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.056ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.100ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.682ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.591ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.126ms
5: nnw.leed-sbr1.ja.net (146.97.40.242) 6.496ms
6: no reply
7: sv220317.tier2.hep.manchester.ac.uk (195.194.105.106) 6.192ms reached
Resume: pmtu 1500 hops 7 back 7
lcgperf.shef.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.066ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.109ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.894ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.573ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.032ms
5: YHMAN-L1.site.ja.net (146.97.42.26) 5.412ms
6: v795.sff-d01.yhman.net.uk (194.81.2.75) 6.210ms
7: cpop1.shffu.yhman.net.uk (195.195.130.34) 6.722ms
8: no reply
9: no reply
10: lcgperf.shef.ac.uk (143.167.3.116) 14.531ms reached
Resume: pmtu 1500 hops 10 back 10
perfmon.dur.scotgrid.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.057ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.087ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.801ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.538ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.753ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.411ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.422ms
7: norman.glas-sbr1.ja.net (146.97.40.106) 14.556ms
8: dur-rtr1-ten-1-1.norman.ja.net (194.81.4.254) 15.026ms
9: no reply
10: no reply
11: no reply
12: no reply
13: perfmon.dur.scotgrid.ac.uk (129.234.193.3) 21.958ms reached
Resume: pmtu 1500 hops 13 back 13
gridpp-ps-band.ecdf.ed.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.130ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.095ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.665ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.647ms
4: as3.leed-sbr1.ja.net (146.97.33.97) asymm 5
5.922ms
5: EastMAN-E1.site.ja.net (146.97.42.46) 11.237ms
6: vlan686.kb6.net.ed.ac.uk (194.81.56.58) 11.104ms
7: vlan688.srif-kb1.net.ed.ac.uk (129.215.255.242) asymm 8
11.122ms
8: vlan674.acf1.net.ed.ac.uk (129.215.255.238) asymm 9
11.449ms
9: vlan674.acf1.net.ed.ac.uk (129.215.255.238) 23.145ms !H
Resume: pmtu 1500
ps001.gla.scotgrid.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.066ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.168ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.921ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.576ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.694ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.439ms
6: ae14.glas-sbr1.ja.net (146.97.33.122) asymm 7
10.328ms
7: clydenet.glas-sbr1.ja.net (146.97.40.98) 10.443ms
8: glasgowuni-ge1-1-glasgowpop-ge1-2-v152.clyde.net.uk (194.81.62.154)
10.897ms
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
epgperf.ph.bham.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.072ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.099ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.779ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.952ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.709ms
5: as3.warr-sbr1.ja.net (146.97.33.90) asymm 6
5.428ms
6: po1.birm-rbr1.ja.net (146.97.35.158) 7.459ms
7: no reply
8: epgperf.ph.bham.ac.uk (193.62.56.9) 7.426ms reached
Resume: pmtu 1500 hops 8 back 8
serv04.hep.phy.cam.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.047ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.147ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.877ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.619ms
4: ae1.chel-rbr3.ja.net (146.97.35.122) asymm 5
1.662ms
5: camb-rbr1.eastern.ja.net (146.97.65.49) asymm 6
3.841ms
6: University-of-Cambridge.Camb-rbr1.eastern.ja.net (146.97.130.2)
4.377ms
7: route-enet.route-mill.net.cam.ac.uk (192.84.5.93) 4.075ms
8: route-mill.route-nwest.net.cam.ac.uk (192.84.5.138) 4.145ms
9: serv04.hep.phy.cam.ac.uk (131.111.66.196) 3.981ms reached
Resume: pmtu 1500 hops 9 back 9
t2ps-bandwidth.physics.ox.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.063ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.088ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.673ms
3: ae3.lond-sbr1.ja.net (146.97.35.145) asymm 4
0.581ms
4: ae0-0.read-rbr3.ja.net (146.97.35.66) asymm 5
1.805ms
5: xe-1-0-0.oxfo-rbr3.ja.net (193.63.108.138) asymm 6
2.624ms
6: xe-2-0-0.oxfo-rbr2.ja.net (193.63.108.142) asymm 7
2.817ms
7: Oxford-University-1.ja.net (193.63.109.110) 3.103ms
8: coucs1b.backbone.ox.ac.uk (192.76.21.1) 3.201ms
9: t2ps-bandwidth.physics.ox.ac.uk (163.1.5.211) 3.042ms reached
Resume: pmtu 1500 hops 9 back 9
heplnx130.pp.rl.ac.uk
1: perfsonar-latency.esc.qmul.ac.uk (194.36.10.38) 0.057ms pmtu
1500
1: 194.36.10.254 (194.36.10.254) 0.082ms
2: Te-0-4-0-5.londsh-rbr1.ja.net (146.97.143.225) 0.857ms
3: be2.londic-rbr1.ja.net (146.97.66.34) 1.484ms
4: ae2.read-sbr1.ja.net (146.97.35.149) asymm 5
1.719ms
5: ral-1.site.ja.net (146.97.41.158) 2.460ms
6: no reply
7: heplnx130.pp.rl.ac.uk (130.246.47.130) 2.101ms !H
Resume: pmtu 1500
[root@perfsonar-latency ~]#
Chris
