Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Author Topic: I can't get to 194.35.194.231 [edit: My misinterpretation]  (Read 1257 times)

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick

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      
« Last Edit: May 11, 2018, 10:01:43 AM by Weaver »
Logged

d2d4j

  • Reg Member
  • ***
  • Posts: 729

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.
Logged

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick

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.
Logged

burakkucat

  • Global Moderator
  • Senior Kitizen
  • *
  • Posts: 24231
  • Over the Rainbow Bridge
    • The ELRepo Project
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #3 on: May 11, 2018, 05:39:57 PM »

Looking from a slightly different angle --

Code: [Select]
[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 ~]$

  ;)
Logged
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

Please consider making a donation to support the running of this site.

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #4 on: May 11, 2018, 06:30:35 PM »

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.

Logged

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #5 on: June 11, 2018, 05:23:50 PM »

It seems they are breaking PMTUD which is very bad, clue required.

[Moderator edited to insert the link.]
« Last Edit: June 11, 2018, 06:35:38 PM by burakkucat »
Logged

spring

  • Reg Member
  • ***
  • Posts: 322
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #6 on: June 11, 2018, 08:24:38 PM »

Code: [Select]
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----
« Last Edit: June 11, 2018, 08:36:08 PM by spring »
Logged
No one knows what is the taste of the void.

burakkucat

  • Global Moderator
  • Senior Kitizen
  • *
  • Posts: 24231
  • Over the Rainbow Bridge
    • The ELRepo Project
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #7 on: June 11, 2018, 08:35:49 PM »

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 ~]$
Logged
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

Please consider making a donation to support the running of this site.

burakkucat

  • Global Moderator
  • Senior Kitizen
  • *
  • Posts: 24231
  • Over the Rainbow Bridge
    • The ELRepo Project
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #8 on: June 11, 2018, 08:41:46 PM »

Hmm, I'm not so sure that it is broken . . . more like something is mis-configured.

Code: [Select]
[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 MÚr Ostaig into the web-browser's address bar I am taken to the site's front page (totally incomprehensible, to me  ;)  ).
« Last Edit: June 11, 2018, 08:49:51 PM by burakkucat »
Logged
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

Please consider making a donation to support the running of this site.

spring

  • Reg Member
  • ***
  • Posts: 322
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #9 on: June 11, 2018, 08:56:07 PM »

Code: [Select]
Received: from warlock.wand.net.nz (warlock.cms.waikato.ac.nz [130.217.250.15])
by node1 (Haraka/2.8.16) with ESMTP id 54DC2929-703B-4A1C-8F6D-215157AE856F.1
envelope-from <www-data@wand.net.nz>;
Mon, 11 Jun 2018 19:46:56 +0000
Received: from www-data by warlock.wand.net.nz with local (Exim 4.80)
(envelope-from <www-data@wand.net.nz>)
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
Code: [Select]
Received: from warlock.wand.net.nz (warlock.cms.waikato.ac.nz [130.217.250.15])
by node4 (Haraka/2.8.16) with ESMTP id 44EDF58D-FD69-44E7-BD36-CA7E9BDC183C.1
envelope-from <www-data@wand.net.nz>;
Mon, 11 Jun 2018 14:55:54 -0500
Received: from www-data by warlock.wand.net.nz with local (Exim 4.80)
(envelope-from <www-data@wand.net.nz>)
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  *
24  *
25  *
26  *
27  *
« Last Edit: June 11, 2018, 08:58:48 PM by spring »
Logged
No one knows what is the taste of the void.

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #10 on: June 11, 2018, 09:37:38 PM »

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.
Logged

d2d4j

  • Reg Member
  • ***
  • Posts: 729
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #11 on: June 11, 2018, 09:39:29 PM »

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

Iím sorry if Iím wrong though, it is not our system so have no insight of their setup

Many thanks

John
Logged

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6386
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #12 on: June 11, 2018, 09:56:39 PM »

@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, thatís what itís 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.
Logged

spring

  • Reg Member
  • ***
  • Posts: 322
Re: I can't get to 194.35.194.231 [edit: My misinterpretation]
« Reply #13 on: June 11, 2018, 10:27:09 PM »

https://www.serversniff.net/
Code: [Select]
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
16 *
17 *
18 *
19 *
20 *
21 *
22 *
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
15 *
16 *
17 *
18 *
19 *
20 *
21 *
22 *
23 *
24 *
25 *
26 *
27 *
28 *
29 *
30 *
31 *
32 *
33 *
34 *
35 *
36 *
37 *
38 *
39 *
40 *



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
15 *
16 *
17 *
18 *
19 *
20 *
21 *
22 *
23 *
24 *
25 *
26 *
27 *
28 *
29 *
30 *
31 *
32 *
33 *
34 *
35 *
36 *
37 *
38 *
39 *
40 *
Various sites
Code: [Select]
Tracerouting 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  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
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  * * *
12  * * *
13  * * *
14  * * *
15  * * *
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
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *



 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
10  *
11  *
12  *
13  *
14  *
15  *
16  *
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
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *
« Last Edit: June 11, 2018, 10:53:26 PM by spring »
Logged
No one knows what is the taste of the void.