Kitz Forum
Broadband Related => Known Network Issues + MSO's => Topic started by: Weaver on May 11, 2018, 05:42:20 AM
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Starting from the ISP AA and tracing route northwards from London towards 194.35.194.231= smo.uhi.ac.uk the traceroute gets as far as Leeds, then to Edinburgh and then dies. That particular box is actually physically here in Skye just down the road.
Tested at 0502 am
Btw the website www.uhi.ac.uk (different domain, missing 'smo') is I think hosted by a CDN at who knows where and that is up, but it is of no relevance, so don't let that mislead anyone.
Traceroute -> 194.35.194.231
No Time(ms) IP Address Note Name
1 36.081 81.187.81.187 Progress
2 35.032 90.155.53.101 Progress
3 36.592 195.66.224.15 Progress
4 37.593 146.97.35.169 Progress
5 44.323 146.97.33.62 Progress
6 53.941 146.97.33.29 Progress
7 42.758 146.97.33.49 Progress
8 45.039 146.97.37.238 Progress
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
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Hi Weaver
I am sorry, I can access the website without issue and my tracert is below.
I would consider the timeouts to be a firewall/edge dropping of pings
Many thanks
John
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
tracert smo.uhi.ac.uk
Tracing route to smo.uhi.ac.uk [194.35.194.231]
over a maximum of 30 hops:
1 1 ms <1 ms 1 ms 192.168.18.1
2 1 ms 1 ms 1 ms 192.168.1.1
3 16 ms 16 ms 16 ms host81-139-192-1.in-addr.btopenworld.com [81.139
.192.1]
4 16 ms 16 ms 16 ms 213.120.182.141
5 17 ms 17 ms 16 ms 213.120.161.82
6 17 ms 17 ms 17 ms 213.120.182.65
7 17 ms 17 ms 18 ms 31.55.164.107
8 17 ms 17 ms 17 ms 109.159.248.75
9 22 ms 22 ms 22 ms 109.159.248.182
10 23 ms 23 ms 24 ms peer5-te0-9-0-7.telehouse.ukcore.bt.net [109.159
.254.144]
11 24 ms 23 ms 23 ms 195.99.125.18
12 21 ms 21 ms 21 ms ae24.londtt-sbr1.ja.net [146.97.35.193]
13 40 ms 21 ms 21 ms ae28.londtw-sbr2.ja.net [146.97.33.62]
14 27 ms 27 ms 26 ms ae31.lowdss-sbr1.ja.net [146.97.33.29]
15 27 ms 26 ms 26 ms ae29.leedaq-sbr2.ja.net [146.97.33.49]
16 30 ms 30 ms 29 ms ae21.edinsc-ban1.ja.net [146.97.37.238]
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.
Trace complete.
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Ah, I've got you - ja.net or more likely the edge of uhi.ac.uk is just filtering out pings. Thank you for that.
Good what an utter fool, I never tried just went ahead and tried tcp port 80. >:( :-[
I wonder if they filter all ICMP out and then break path mtu discovery because if so then that would be very nasty. But maybe it is just ping.
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Looking from a slightly different angle --
[Duo2 ~]$ host smo.uhi.ac.uk
smo.uhi.ac.uk has address 194.35.194.231
smo.uhi.ac.uk mail is handled by 10 damh.smo.uhi.ac.uk.
[Duo2 ~]$ ping -c1 smo.uhi.ac.uk
PING smo.uhi.ac.uk (194.35.194.231) 56(84) bytes of data.
--- smo.uhi.ac.uk ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 10000ms
[Duo2 ~]$ sudo traceroute -T smo.uhi.ac.uk
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 60 byte packets
1 AP (192.168.230.254) 3.064 ms 3.064 ms 3.051 ms
2 host-78-151-238-209.as13285.net (78.151.238.209) 33.939 ms 33.941 ms 33.923 ms
3 host-78-151-238-208.as13285.net (78.151.238.208) 33.902 ms 37.302 ms 37.300 ms
4 host-78-144-14-114.as13285.net (78.144.14.114) 40.129 ms host-78-144-14-102.as13285.net (78.144.14.102) 40.114 ms host-78-144-14-116.as13285.net (78.144.14.116) 40.098 ms
5 host-78-144-14-102.as13285.net (78.144.14.102) 42.493 ms linx-gw1.ja.net (195.66.224.15) 42.474 ms 42.457 ms
6 ae23.londtt-sbr1.ja.net (146.97.35.169) 45.057 ms 42.022 ms linx-gw1.ja.net (195.66.224.15) 41.836 ms
7 ae28.londtw-sbr2.ja.net (146.97.33.62) 41.700 ms 33.026 ms 32.968 ms
8 ae31.lowdss-sbr1.ja.net (146.97.33.29) 37.442 ms ae28.londtw-sbr2.ja.net (146.97.33.62) 37.313 ms ae31.lowdss-sbr1.ja.net (146.97.33.29) 36.954 ms
9 ae31.lowdss-sbr1.ja.net (146.97.33.29) 36.733 ms ae29.leedaq-sbr2.ja.net (146.97.33.49) 40.800 ms 37.812 ms
10 ae21.edinsc-ban1.ja.net (146.97.37.238) 42.577 ms ae29.leedaq-sbr2.ja.net (146.97.33.49) 39.281 ms 37.535 ms
11 146.97.41.178 (146.97.41.178) 51.508 ms 52.299 ms ae21.edinsc-ban1.ja.net (146.97.37.238) 42.597 ms
12 146.97.41.178 (146.97.41.178) 52.456 ms 54.221 ms 54.189 ms
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 damh.smo.uhi.ac.uk (194.35.194.231) 59.328 ms 59.155 ms 59.126 ms
[Duo2 ~]$
;)
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I did try from a completely different starting point, somewhere maybe in Germany I think, using an online ping and traceroute service and just the same. So it has to be them being antisocial or paranoid.
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It seems they are breaking PMTUD (https://en.wikipedia.org/wiki/Path_MTU_Discovery) which is very bad, clue required.
[Moderator edited to insert the link.]
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PING smo.uhi.ac.uk (194.35.194.231): 56 data bytes
Request timed out
Request timed out
Request timed out
Request timed out
--- smo.uhi.ac.uk ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 38 byte packets
1 bzq-179-37-1.cust.bezeqint.net (212.179.37.1) 11.007 ms 10.286 ms 10.437 ms
2 10.250.0.170 (10.250.0.170) 10.721 ms 10.560 ms 10.911 ms
3 bzq-25-77-10.cust.bezeqint.net (212.25.77.10) 69.487 ms 69.542 ms 69.125 ms
4 bzq-114-65-2.cust.bezeqint.net (192.114.65.2) 11.190 ms - ms - ms
5 bzq-219-189-230.dsl.bezeqint.net (62.219.189.230) 68.404 ms - ms - ms
6 bzq-179-124-153.cust.bezeqint.net (212.179.124.153) 58.006 ms - ms - ms
7 ae8.cr1-fra2.ip4.gtt.net (46.33.89.237) 63.959 ms - ms - ms
8 et-11-3-0.cr1-man1.ip4.gtt.net (213.254.214.246) 82.506 ms - ms - ms
9 ip4.gtt.net (46.33.78.82) 81.540 ms - ms - ms
10 ae30.leedaq-sbr2.ja.net (146.97.33.46) 82.784 ms - ms - ms
11 ae0.dund-ban3.ja.net (146.97.37.182) 95.204 ms 88.048 ms - ms
12 ae0.dund-ban3.ja.net (146.97.37.182) 88.129 ms 87.901 ms - ms
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
----Traceroute end----
traceroute to damh.smo.uhi.ac.uk (194.35.194.231), 30 hops max, 38 byte packets
1 bzq-179-37-1.cust.bezeqint.net (212.179.37.1) 10.738 ms 10.900 ms 10.338 ms
2 10.250.0.170 (10.250.0.170) 10.665 ms 11.168 ms 10.429 ms
3 bzq-25-77-10.cust.bezeqint.net (212.25.77.10) 104.658 ms 69.131 ms 69.187 ms
4 bzq-219-189-230.cablep.bezeqint.net (62.219.189.230) 68.474 ms - ms - ms
5 bzq-114-65-2.cust.bezeqint.net (192.114.65.2) 11.118 ms - ms - ms
6 bzq-161-218.pop.bezeqint.net (212.179.161.218) 58.935 ms - ms - ms
7 ae8.cr1-fra2.ip4.gtt.net (46.33.89.237) 63.919 ms - ms - ms
8 et-11-3-0.cr1-man1.ip4.gtt.net (213.254.214.246) 80.189 ms - ms - ms
9 ae22.manckh-sbr2.ja.net (146.97.35.189) 87.255 ms - ms - ms
10 ae22.manckh-sbr2.ja.net (146.97.35.189) 83.385 ms 83.317 ms 79.920 ms
11 ae0.dund-ban3.ja.net (146.97.37.182) 88.741 ms - ms - ms
12 ae30.leedaq-sbr2.ja.net (146.97.33.46) 85.932 ms - ms - ms
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
----Traceroute end----
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Yes, it seems to be broken for me . . .
[Duo2 ~]$ host smo.uhi.ac.uk
smo.uhi.ac.uk has address 194.35.194.231
smo.uhi.ac.uk mail is handled by 10 damh.smo.uhi.ac.uk.
[Duo2 Downloads]$ host 194.35.194.231
231.194.35.194.in-addr.arpa domain name pointer damh.smo.uhi.ac.uk.
[Duo2 Downloads]$ ping -c1 smo.uhi.ac.uk
PING smo.uhi.ac.uk (194.35.194.231) 56(84) bytes of data.
--- smo.uhi.ac.uk ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 10000ms
[Duo2 ~]$
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Hmm, I'm not so sure that it is broken . . . more like something is mis-configured.
[Duo2 ~]$ sudo traceroute -I smo.uhi.ac.uk
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 60 byte packets
1 AP (192.168.230.254) 3.105 ms 3.088 ms 3.086 ms
2 host-78-151-238-209.as13285.net (78.151.238.209) 31.164 ms 31.216 ms 31.206 ms
3 host-78-151-238-208.as13285.net (78.151.238.208) 34.012 ms 34.061 ms *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 ae29.leedaq-sbr2.ja.net (146.97.33.49) 35.741 ms 35.696 ms 37.926 ms
10 ae0.dund-ban3.ja.net (146.97.37.182) 42.834 ms 42.818 ms *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
[Duo2 ~]$ sudo traceroute -T smo.uhi.ac.uk
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 60 byte packets
1 AP (192.168.230.254) 3.464 ms 3.363 ms 3.289 ms
2 host-78-151-238-209.as13285.net (78.151.238.209) 30.844 ms 30.796 ms 33.280 ms
3 host-78-151-238-212.as13285.net (78.151.238.212) 33.231 ms 44.220 ms 35.934 ms
4 host-78-144-14-114.as13285.net (78.144.14.114) 62.866 ms host-78-144-14-104.as13285.net (78.144.14.104) 35.834 ms host-78-144-14-112.as13285.net (78.144.14.112) 38.395 ms
5 host-78-144-14-106.as13285.net (78.144.14.106) 38.393 ms linx-gw1.ja.net (195.66.224.15) 38.328 ms 38.264 ms
6 linx-gw1.ja.net (195.66.224.15) 40.699 ms ae23.londtt-sbr1.ja.net (146.97.35.169) 38.351 ms 38.262 ms
7 ae23.londtt-sbr1.ja.net (146.97.35.169) 40.921 ms 31.294 ms 31.133 ms
8 ae28.londtw-sbr2.ja.net (146.97.33.62) 30.945 ms ae31.lowdss-sbr1.ja.net (146.97.33.29) 33.418 ms 33.362 ms
9 ae29.leedaq-sbr2.ja.net (146.97.33.49) 36.160 ms ae31.lowdss-sbr1.ja.net (146.97.33.29) 36.067 ms ae29.leedaq-sbr2.ja.net (146.97.33.49) 38.720 ms
10 ae29.leedaq-sbr2.ja.net (146.97.33.49) 38.671 ms ae0.dund-ban3.ja.net (146.97.37.182) 45.672 ms 45.655 ms
11 ae0.dund-ban3.ja.net (146.97.37.182) 45.583 ms 45.539 ms 48.723 ms
12 146.97.40.118 (146.97.40.118) 51.068 ms 40.550 ms *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 damh.smo.uhi.ac.uk (194.35.194.231) 52.774 ms 52.824 ms 52.818 ms
[Duo2 ~]$ sudo traceroute -U smo.uhi.ac.uk
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 60 byte packets
1 AP (192.168.230.254) 3.820 ms 44.294 ms 44.221 ms
2 host-78-151-238-209.as13285.net (78.151.238.209) 44.128 ms 44.036 ms 43.944 ms
3 host-78-151-238-212.as13285.net (78.151.238.212) 43.853 ms 70.814 ms host-78-151-238-208.as13285.net (78.151.238.208) 74.744 ms
4 host-78-144-14-104.as13285.net (78.144.14.104) 74.655 ms host-78-144-9-160.as13285.net (78.144.9.160) 77.930 ms host-78-144-14-108.as13285.net (78.144.14.108) 77.837 ms
5 linx-gw1.ja.net (195.66.224.15) 77.745 ms 77.652 ms host-78-144-14-106.as13285.net (78.144.14.106) 80.148 ms
6 linx-gw1.ja.net (195.66.224.15) 80.063 ms ae23.londtt-sbr1.ja.net (146.97.35.169) 80.177 ms 30.553 ms
7 ae28.londtw-sbr2.ja.net (146.97.33.62) 30.299 ms ae23.londtt-sbr1.ja.net (146.97.35.169) 30.116 ms 31.174 ms
8 ae31.lowdss-sbr1.ja.net (146.97.33.29) 49.976 ms 49.904 ms ae28.londtw-sbr2.ja.net (146.97.33.62) 31.009 ms
9 ae29.leedaq-sbr2.ja.net (146.97.33.49) 40.786 ms 40.750 ms 40.706 ms
10 ae29.leedaq-sbr2.ja.net (146.97.33.49) 40.662 ms ae0.dund-ban3.ja.net (146.97.37.182) 46.889 ms ae29.leedaq-sbr2.ja.net (146.97.33.49) 43.098 ms
11 ae0.dund-ban3.ja.net (146.97.37.182) 49.432 ms * 49.393 ms
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
[Duo2 ~]$
If I enter Sabhal Mòr Ostaig into the web-browser's address bar I am taken to the site's front page (totally incomprehensible, to me ;) ).
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Received: from warlock.wand.net.nz (warlock.cms.waikato.ac.nz [130.217.250.15])
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id 1fSSoZ-000548-7l; Tue, 12 Jun 2018 07:49:19 +1200
To: poheyey@yk20.com
Subject: PMTUD Test Results - smo.uhi.ac.uk
From: PMTUD Test <mjl@wand.net.nz>
Message-Id: <E1fSSoZ-000548-7l@warlock.wand.net.nz>
Sender: www-data <www-data@wand.net.nz>
Date: Tue, 12 Jun 2018 07:49:19 +1200
tbit from 130.217.250.115 to 194.35.194.231
server-mss 1460, result: pmtud-success
app: http, url: http://smo.uhi.ac.uk/
[ 0.010] TX SYN 44 seq = 0:0 5cad
[ 0.324] RX SYN/ACK 44 seq = 0:1 0000
[ 0.324] TX 40 seq = 1:1 5cae
[ 0.334] TX 212 seq = 1:1(172) 5caf DF
[ 0.647] RX 40 seq = 1:173 a502
[ 1.458] RX 1500 seq = 1:173(1460) a503 DF
[ 1.458] RX 1500 seq = 1461:173(1460) a504 DF
[ 1.458] RX 1500 seq = 2921:173(1460) a505 DF
[ 1.458] TX PTB 56 mtu = 1280
[ 1.458] RX 1500 seq = 4381:173(1460) a506 DF
[ 1.458] RX 1500 seq = 5841:173(1460) a507 DF
[ 1.459] RX 1500 seq = 7301:173(1460) a508 DF
[ 1.459] RX 1500 seq = 8761:173(1460) a509 DF
[ 1.459] RX 1500 seq = 10221:173(1460) a50a DF
[ 1.459] RX 1500 seq = 11681:173(1460) a50b DF
[ 1.459] RX 1500 seq = 13141:173(1460) a50c DF
[ 1.772] RX 1280 seq = 1:173(1240) a50d DF
[ 1.772] RX 1280 seq = 1241:173(1240) a50e DF
[ 1.772] RX 480 seq = 2481:173(440) a50f DF
[ 1.772] TX 40 seq = 173:1241 5cb1
[ 1.772] RX 1280 seq = 2921:173(1240) a510 DF
[ 1.772] RX 1280 seq = 4161:173(1240) a511 DF
[ 1.772] RX 480 seq = 5401:173(440) a512 DF
[ 1.772] RX 1280 seq = 5841:173(1240) a513 DF
[ 1.773] RX 1280 seq = 7081:173(1240) a514 DF
[ 1.773] RX 480 seq = 8321:173(440) a515 DF
[ 1.773] RX 1280 seq = 8761:173(1240) a516 DF
[ 1.782] TX FIN 40 seq = 173:2481 5cb2
[ 1.792] TX FIN 40 seq = 173:2921 5cb3
[ 1.803] TX FIN 40 seq = 173:4161 5cb4
[ 1.813] TX FIN 40 seq = 173:5401 5cb5
[ 1.823] TX FIN 40 seq = 173:5841 5cb6
[ 1.832] TX FIN 40 seq = 173:7081 5cb7
[ 1.842] TX FIN 40 seq = 173:8321 5cb8
[ 1.852] TX FIN 40 seq = 173:8761 5cb9
[ 1.862] TX FIN 40 seq = 173:10001 5cba
[ 2.086] RX 1280 seq = 10001:173(1240) a517 DF
[ 2.086] RX 1280 seq = 14601:173(1240) a518 DF
[ 2.086] TX FIN 40 seq = 173:11241 5cbb
[ 2.086] TX 40 seq = 173:11241 5cbc
[ 2.095] RX 480 seq = 11241:173(440) a519 DF
[ 2.095] RX 40 seq = 15841:174 a51a
[ 2.095] RX 1280 seq = 15841:174(1240) a51b DF
[ 2.096] TX FIN 40 seq = 173:11681 5cbd
[ 2.096] TX 40 seq = 174:11681 5cbe
[ 2.106] RX 1280 seq = 11681:174(1240) a51c DF
[ 2.106] TX 40 seq = 174:12921 5cbf
[ 2.106] RX 1280 seq = 17081:174(1240) a51d DF
[ 2.106] TX 40 seq = 174:12921 5cc0
[ 2.116] RX 1280 seq = 12921:174(1240) a51e DF
[ 2.116] RX 1280 seq = 18321:174(1240) a51f DF
[ 2.117] TX 40 seq = 174:14161 5cc1
[ 2.117] TX 40 seq = 174:14161 5cc2
[ 2.126] RX 480 seq = 14161:174(440) a520 DF
[ 2.126] TX 40 seq = 174:19561 5cc3
[ 2.126] RX 1280 seq = 19561:174(1240) a521 DF
[ 2.126] TX 40 seq = 174:20801 5cc4
[ 2.136] RX 1280 seq = 20801:174(1240) a522 DF
[ 2.136] RX 1280 seq = 22041:174(1240) a523 DF
[ 2.136] TX 40 seq = 174:22041 5cc5
[ 2.137] TX 40 seq = 174:23281 5cc6
[ 2.145] RX 1280 seq = 23281:174(1240) a524 DF
[ 2.146] RX 1280 seq = 24521:174(1240) a525 DF
[ 2.146] TX 40 seq = 174:24521 5cc7
[ 2.146] TX 40 seq = 174:25761 5cc8
[ 2.156] RX 1280 seq = 25761:174(1240) a526 DF
[ 2.156] RX 1280 seq = 27001:174(1240) a527 DF
[ 2.156] TX 40 seq = 174:27001 5cc9
[ 2.156] TX 40 seq = 174:28241 5cca
[ 2.166] RX 1280 seq = 28241:174(1240) a528 DF
[ 2.166] RX 1280 seq = 29481:174(1240) a529 DF
[ 2.166] TX 40 seq = 174:29481 5ccb
[ 2.166] TX 40 seq = 174:30721 5ccc
[ 2.176] RX 1280 seq = 30721:174(1240) a52a DF
[ 2.176] RX 1280 seq = 31961:174(1240) a52b DF
[ 2.176] TX 40 seq = 174:31961 5ccd
[ 2.176] TX 40 seq = 174:33201 5cce
[ 2.399] RX 1280 seq = 33201:174(1240) a52c DF
[ 2.399] RX 1280 seq = 34441:174(1240) a52d DF
[ 2.399] RX 40 seq = 35681:174 a52e
[ 2.400] TX 40 seq = 174:34441 5ccf
[ 2.409] RX 1280 seq = 35681:174(1240) a52f DF
[ 2.409] RX 1280 seq = 36921:174(1240) a530 DF
[ 2.411] TX 40 seq = 174:35681 5cd0
[ 2.419] RX 1280 seq = 38161:174(1240) a531 DF
[ 2.419] RX 1280 seq = 39401:174(1240) a532 DF
[ 2.419] RX FIN 255 seq = 40641:174(215) a533 DF
[ 2.420] TX 40 seq = 174:36921 5cd1
[ 2.430] TX 40 seq = 174:38161 5cd2
[ 2.440] TX 40 seq = 174:39401 5cd3
[ 2.450] TX 40 seq = 174:40641 5cd4
[ 2.460] TX 40 seq = 174:40857 5cd5
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id 1fSSwu-00027M-DS; Tue, 12 Jun 2018 07:57:56 +1200
To: poheyey@yk20.com
Subject: PMTUD Test Results - 194.35.194.231
From: PMTUD Test <mjl@wand.net.nz>
Message-Id: <E1fSSwu-00027M-DS@warlock.wand.net.nz>
Sender: www-data <www-data@wand.net.nz>
Date: Tue, 12 Jun 2018 07:57:56 +1200
traceroute from 130.217.250.115 to 194.35.194.231
1 130.217.248.251 1.044 ms
2 10.5.5.1 0.528 ms
3 130.217.2.4 0.569 ms
4 210.7.39.9 0.668 ms
5 182.255.119.200 3.208 ms
6 113.197.15.70 4.113 ms
7 113.197.15.76 26.740 ms
8 113.197.15.78 27.092 ms
9 113.197.15.99 120.232 ms
10 113.197.15.201 171.365 ms
11 207.231.240.8 161.602 ms
12 162.252.70.0 172.531 ms
13 162.252.70.58 195.482 ms
14 162.252.70.106 203.618 ms
15 162.252.70.130 212.613 ms
16 162.252.70.54 220.104 ms
17 162.252.70.136 220.359 ms
18 62.40.124.44 294.737 ms
19 62.40.124.198 297.403 ms
20 146.97.33.18 298.089 ms
21 146.97.33.49 299.737 ms
22 146.97.37.182 304.708 ms
23 *
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The actual web server is up, but they are blocking pings and possibly all ICMP which I think is evil and due to a shortage of clue. Bad outdated-think. This fooled me before, I tied ping and traceroute, no good, but if you just go and TCP-connect to the website it works.
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Hi
Sorry I do not see that it is broken or breaking any rfc
We sometimes do this depending upon the server/client needs
It could also be a edge/firewall higher up so say from ping 17 onwards
I suspect they are part of a group (as most educational institutes now appear to be), and that is why at say ping 18 it is fully blocked whilst allowing ports through. You would need to be added to authorised cidr range to see the full testing.
I suppose the easiest way perhaps to see it in action, is to turn off your external router ping and then try to ping it from an external system/network, say from an online tester
I’m sorry if I’m wrong though, it is not our system so have no insight of their setup
Many thanks
John
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@spring BTW, in case you thought your browser was corrupting the data, much of the site is incomprehensible because it is in the Scottish Gaelic (gd) language, in fact all tuition is Gaelic language-only, no English allowed.
[I think that that makes it the only solely Celtic-language tertiary education institution in Europe, not even in Wales or Ireland are there any such tertiary institutions where English is not allowed at all. I was a full-time student there twenty years ago, so it is me at whom is knowledge.]
It must be a nuisance if you cannot even ping your own kit to diagnose anything. Duh, that’s what it’s for. They had better pack that nonsense up if they ever get into this century and start using IPv6 so they don't continue to break PMTUD. Thing is, they have a healthy supply of their own IPv4 addresses anyway, so there is little pressure.
I wonder if this would serve as a test site to illustrate problems if you yourself do not have a full 1500 byte IP MTU ? Eg users who are on 1492-byte MTU or artificially reduced values, or who use tunnels.
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https://www.serversniff.net/
Checking 194.35.194.231 using protocol tcp, port 80, 1 queries and 40 hops
2 62.155.242.67 (62.155.242.67) 67.573 ms
3 217.5.118.62 (217.5.118.62) 24.780 ms
4 ffm-b4-link.telia.net (213.248.93.186) 24.713 ms
5 ffm-bb4-link.telia.net (62.115.120.7) 41.739 ms
6 prs-bb4-link.telia.net (62.115.122.138) 42.043 ms
7 ldn-bb3-link.telia.net (62.115.134.93) 41.678 ms
8 ldn-b5-link.telia.net (213.155.132.195) 40.283 ms
9 jisc-ic-318436-ldn-b5.c.telia.net (62.115.148.161) 39.938 ms
10 ae24.londtt-sbr1.ja.net (146.97.35.193) 40.155 ms
11 ae28.londtw-sbr2.ja.net (146.97.33.62) 41.075 ms
12 ae31.lowdss-sbr1.ja.net (146.97.33.29) 43.811 ms
13 ae29.leedaq-sbr2.ja.net (146.97.33.49) 46.862 ms
14 ae0.dund-ban3.ja.net (146.97.37.182) 52.437 ms
15 146.97.40.118 (146.97.40.118) 51.967 ms
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23 damh.smo.uhi.ac.uk (194.35.194.231) 66.355 ms
24 damh.smo.uhi.ac.uk (194.35.194.231) 61.351 ms
25 damh.smo.uhi.ac.uk (194.35.194.231) 60.638 ms
26 damh.smo.uhi.ac.uk (194.35.194.231) 61.050 ms
27 damh.smo.uhi.ac.uk (194.35.194.231) 69.342 ms
28 damh.smo.uhi.ac.uk (194.35.194.231) 61.547 ms
29 damh.smo.uhi.ac.uk (194.35.194.231) 70.376 ms
30 damh.smo.uhi.ac.uk (194.35.194.231) 59.827 ms
31 damh.smo.uhi.ac.uk (194.35.194.231) 60.329 ms
32 damh.smo.uhi.ac.uk (194.35.194.231) 60.907 ms
33 damh.smo.uhi.ac.uk (194.35.194.231) 59.825 ms
34 damh.smo.uhi.ac.uk (194.35.194.231) 60.133 ms
35 damh.smo.uhi.ac.uk (194.35.194.231) 60.121 ms
36 damh.smo.uhi.ac.uk (194.35.194.231) 61.192 ms
37 damh.smo.uhi.ac.uk (194.35.194.231) 60.441 ms
38 damh.smo.uhi.ac.uk (194.35.194.231) 60.738 ms
39 damh.smo.uhi.ac.uk (194.35.194.231) 60.228 ms
40 damh.smo.uhi.ac.uk (194.35.194.231) 60.763 ms
Checking 194.35.194.231 using protocol icmp, port 80, 1 queries and 40 hops
2 62.155.242.67 (62.155.242.67) 18.058 ms
3 217.5.118.62 (217.5.118.62) 25.244 ms
4 ffm-b4-link.telia.net (213.248.93.186) 24.915 ms
5 ffm-bb3-link.telia.net (62.115.120.1) 40.383 ms
6 prs-bb3-link.telia.net (62.115.123.13) 41.864 ms
7 ldn-bb3-link.telia.net (62.115.134.93) 41.364 ms
8 ldn-b5-link.telia.net (213.155.132.195) 41.078 ms
9 jisc-ic-318436-ldn-b5.c.telia.net (62.115.148.161) 40.078 ms
10 ae24.londtt-sbr1.ja.net (146.97.35.193) 40.208 ms
11 ae28.londtw-sbr2.ja.net (146.97.33.62) 42.448 ms
12 ae31.lowdss-sbr1.ja.net (146.97.33.29) 43.199 ms
13 ae29.leedaq-sbr2.ja.net (146.97.33.49) 50.139 ms
14 ae0.dund-ban3.ja.net (146.97.37.182) 54.172 ms
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Checking 194.35.194.231 using protocol udp, port 80, 1 queries and 40 hops
2 62.155.242.67 (62.155.242.67) 17.800 ms
3 217.239.47.14 (217.239.47.14) 26.035 ms
4 ffm-b4-link.telia.net (213.248.93.186) 26.051 ms
5 ffm-bb3-link.telia.net (62.115.120.1) 45.140 ms
6 prs-bb3-link.telia.net (62.115.123.13) 42.480 ms
7 ldn-bb3-link.telia.net (62.115.134.93) 41.674 ms
8 ldn-b5-link.telia.net (213.155.132.195) 41.545 ms
9 jisc-ic-318436-ldn-b5.c.telia.net (62.115.148.161) 41.607 ms
10 ae24.londtt-sbr1.ja.net (146.97.35.193) 41.355 ms
11 ae28.londtw-sbr2.ja.net (146.97.33.62) 40.643 ms
12 ae31.lowdss-sbr1.ja.net (146.97.33.29) 45.383 ms
13 ae29.leedaq-sbr2.ja.net (146.97.33.49) 48.857 ms
14 ae0.dund-ban3.ja.net (146.97.37.182) 53.048 ms
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Various sitesTracerouting to smo.uhi.ac.uk using TCP packets...
1 L300.DLLSTX-VFTTP-49.gni.frontiernet.net (71.252.219.1) 3.676 ms 4.739 ms 4.935 ms
2 172.102.55.124 7.491 ms 12.224 ms 7.615 ms
3 ae8---0.scr02.dlls.tx.frontiernet.net (74.40.3.25) 4.948 ms 4.778 ms 5.008 ms
4 ae1---0.cbr01.dlls.tx.frontiernet.net (74.40.1.82) 4.933 ms 7.312 ms 5.131 ms
5 lag-102.ear3.Dallas1.Level3.net (4.15.44.125) 4.937 ms 4.502 ms 4.437 ms
6 ae10.cr10-dal3.ip4.gtt.net (77.67.71.221) 6.941 ms 4.726 ms 5.067 ms
7 et-11-3-0.cr1-man1.ip4.gtt.net (213.254.214.246) 119.993 ms 119.617 ms 119.984 ms
8 ip4.gtt.net (46.33.78.82) 120.139 ms 119.546 ms 119.989 ms
9 ae22.manckh-sbr2.ja.net (146.97.35.189) 119.992 ms 124.205 ms 120.035 ms
10 ae30.leedaq-sbr2.ja.net (146.97.33.46) 122.469 ms 131.550 ms 122.033 ms
11 ae0.dund-ban3.ja.net (146.97.37.182) 127.353 ms 127.214 ms 127.428 ms
12 146.97.40.118 127.544 ms 127.197 ms 127.429 ms
13 * * *
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20 damh.smo.uhi.ac.uk (194.35.194.231) [open] 132.952 ms 134.813 ms 997.335 ms
TCP TraceRoute Output:
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 40 byte packets
1 gw-v130.xl-is.net (141.138.203.1) 41.877 ms 0.587 ms 41.969 ms
2 te0-22.cr1.nkf.as49685.net (80.246.207.190) 1.334 ms 1.611 ms 1.683 ms
3 a3718.as49685.atom86.net (95.142.106.210) 0.648 ms 0.718 ms 0.702 ms
4 * * *
5 ae23.londtt-sbr1.ja.net (146.97.35.169) 8.733 ms 8.798 ms 8.781 ms
6 ae28.londtw-sbr2.ja.net (146.97.33.62) 13.710 ms 13.420 ms 13.264 ms
7 ae31.lowdss-sbr1.ja.net (146.97.33.29) 20.512 ms 20.456 ms 20.013 ms
8 ae29.leedaq-sbr2.ja.net (146.97.33.49) 13.711 ms 13.626 ms 17.473 ms
9 ae0.dund-ban3.ja.net (146.97.37.182) 18.476 ms 18.455 ms 18.808 ms
10 146.97.40.118 (146.97.40.118) 19.192 ms 19.296 ms 19.438 ms
11 * * *
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16 damh.smo.uhi.ac.uk (194.35.194.231) 27.744 ms 27.730 ms 27.705 ms
ICMP TraceRoute Output:
traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 40 byte packets
1 gw-v130.xl-is.net (141.138.203.1) 10.043 ms 10.232 ms 10.574 ms
2 te0-22.cr1.nkf.as49685.net (80.246.207.190) 2.232 ms 2.231 ms 2.224 ms
3 a3718.as49685.atom86.net (95.142.106.210) 0.710 ms 0.733 ms 0.728 ms
4 * * *
5 ae23.londtt-sbr1.ja.net (146.97.35.169) 8.737 ms 8.766 ms 8.750 ms
6 ae28.londtw-sbr2.ja.net (146.97.33.62) 8.698 ms 8.820 ms 8.801 ms
7 ae31.lowdss-sbr1.ja.net (146.97.33.29) 11.928 ms 11.940 ms 11.930 ms
8 ae29.leedaq-sbr2.ja.net (146.97.33.49) 13.565 ms 13.651 ms 13.624 ms
9 ae0.dund-ban3.ja.net (146.97.37.182) 18.469 ms 18.463 ms 18.412 ms
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Success! tcptraceroute on port 80 to smo.uhi.ac.uk
1 router1-nac.linode.com (207.99.1.13) 0.794 ms
2 173.255.239.50 0.844 ms
3 ae5.cr9-nyc3.ip4.gtt.net (173.205.38.197) 1.163 ms
4 et-11-3-0.cr1-man1.ip4.gtt.net (213.254.214.246) 80.774 ms
5 ip4.gtt.net (46.33.78.82) 80.777 ms
6 ae22.manckh-sbr2.ja.net (146.97.35.189) 86.877 ms
7 ae30.leedaq-sbr2.ja.net (146.97.33.46) 83.426 ms
8 ae0.dund-ban3.ja.net (146.97.37.182) 88.352 ms
9 146.97.40.118 89.128 ms
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17 damh.smo.uhi.ac.uk (194.35.194.231) [open] 96.766 ms
UDP traceroute to smo.uhi.ac.uk (194.35.194.231), 30 hops max, 60 byte packets
1 static.33.75.46.78.clients.your-server.de (78.46.75.33) 0.363 ms 0.361 ms 0.357 ms
2 core22.fsn1.hetzner.com (213.239.229.253) 0.351 ms 0.343 ms core21.fsn1.hetzner.com (213.239.229.249) 49.474 ms
3 core12.nbg1.hetzner.com (213.239.224.13) 38.972 ms core11.nbg1.hetzner.com (213.239.245.221) 14.796 ms core11.nbg1.hetzner.com (213.239.224.9) 44.113 ms
4 juniper5.dc2.nbg1.hetzner.com (213.239.229.162) 2.949 ms juniper5.dc2.nbg1.hetzner.com (213.239.229.166) 2.948 ms 2.942 ms
5 ae5-710.nbg40.core-backbone.com (81.95.15.5) 3.276 ms 2.926 ms 3.264 ms
6 ae6-2077.lon10.core-backbone.com (5.56.18.2) 16.028 ms 16.056 ms 16.051 ms
7 * * *
8 ae23.londtt-sbr1.ja.net (146.97.35.169) 19.466 ms 19.494 ms 19.477 ms
9 ae28.londtw-sbr2.ja.net (146.97.33.62) 19.003 ms 19.066 ms 19.050 ms
10 ae31.lowdss-sbr1.ja.net (146.97.33.29) 21.958 ms 22.005 ms 21.924 ms
11 ae29.leedaq-sbr2.ja.net (146.97.33.49) 27.075 ms 27.053 ms 27.004 ms
12 ae0.dund-ban3.ja.net (146.97.37.182) 32.084 ms 32.051 ms 31.994 ms
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