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Plusnet's DNS giving out different IPs with longer routes for Akamai

Community Veteran
Posts: 5,059
Thanks: 426
Fixes: 16
Registered: 10-06-2010

Plusnet's DNS giving out different IPs with longer routes for Akamai

I've just noticed that Plusnet's own DNS servers are giving out various IP addresses for Akamai hosted websites, directing traffic out along longer routes, while OpenDNS is returning IP addresses that have shorter routes.
For example, Plusnet's DNS giving:
dig @212.159.6.9 static.bbci.co.uk
static.bbci.co.uk. 668 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 203 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 12698 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 19 IN A 23.212.108.110
a1638.g.akamai.net. 19 IN A 23.212.108.86
traceroute to 23.212.108.110 (23.212.108.110), 30 hops max, 52 byte packets
1  192.168.0.1 (192.168.0.1)  1.338 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  20.879 ms
3  link-b-central10.ptn-gw02.plus.net (212.159.2.138)  20.969 ms
4  xe-5-3-0.ptw-cr02.plus.net (212.159.0.110)  19.704 ms
5  ae2.ptw-cr01.plus.net (195.166.129.4)  19.831 ms
6  te-3-4.car5.London1.Level3.net (217.163.45.181)  123.285 ms
7  ae-51-51.csw1.London1.Level3.net (4.69.139.88)  20.882 ms
8  ae-3-3.ebr1.Paris1.Level3.net (4.69.141.86)  28.035 ms
9  ix-20-0.tcore1.LDN-London.as6453.net (195.219.83.101)  20.684 ms
10  ae-2-70.edge5.Paris1.Level3.net (4.69.168.72)  27.205 ms
11  80.231.20.42 (80.231.20.42)  40.050 ms
12  if-2-2.tcore1.PYE-Paris.as6453.net (80.231.154.18)  28.595 ms
13  if-3-6.tcore1.L78-London.as6453.net (80.231.130.85)  29.440 ms
14  a23-212-108-110.deploy.static.akamaitechnologies.com (23.212.108.110)  32.454 ms

vs. OpenDNS
dig @208.67.222.220 static.bbci.co.uk
static.bbci.co.uk. 527 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 126 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 1444 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 20 IN A 23.62.53.67
a1638.g.akamai.net. 20 IN A 23.62.53.49
traceroute to 23.62.53.67 (23.62.53.67), 30 hops max, 52 byte packets
1  192.168.0.1 (192.168.0.1)  1.431 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  24.365 ms
3  link-a-central10.ptn-gw01.plus.net (212.159.2.136)  20.089 ms
4  xe-5-3-0.ptw-cr01.plus.net (212.159.0.108)  20.141 ms
5  ae2.ptw-cr02.plus.net (195.166.129.5)  19.858 ms
6  *
7  a23-62-53-67.deploy.static.akamaitechnologies.com (23.62.53.67)  20.894 ms
14 REPLIES
Community Veteran
Posts: 1,840
Thanks: 102
Fixes: 6
Registered: 21-01-2013

Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Looks like it could be a routing issue to me, bouncing between London and Paris.
OK here:
Quote
; <<>> DiG 9.8.6-P1 <<>> @212.159.6.9 static.bbci.co.uk
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21530
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;static.bbci.co.uk.            IN      A
;; ANSWER SECTION:
static.bbci.co.uk.      387    IN      CNAME  static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 169    IN      CNAME  static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 10500 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net.    13      IN      A      23.61.255.219
a1638.g.akamai.net.    13      IN      A      23.61.255.216
;; Query time: 31 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar 01 13:58:54 GMT Standard Time 2014
;; MSG SIZE  rcvd: 175

Tracing route to a23-61-255-219.deploy.static.akamaitechnologies.com [23.61.255.
219]
over a maximum of 30 hops:
  1    52 ms    99 ms    94 ms  dsldevice.lan [192.168.1.254]
  2    27 ms    26 ms    25 ms  lo0-central10.ptw-ag01.plus.net [195.166.128.195
]
  3    27 ms    29 ms    25 ms  link-b-central10.ptw-gw02.plus.net [212.159.2.14
6]
  4    30 ms    25 ms    27 ms  xe-4-2-0.ptw-cr02.plus.net [212.159.0.242]
  5    26 ms    25 ms    25 ms  ae2.ptw-cr01.plus.net [195.166.129.4]
  6    *        *        *    Request timed out.
  7    28 ms    26 ms    25 ms  a23-61-255-219.deploy.static.akamaitechnologies.
com [23.61.255.219]

Community Veteran
Posts: 2,274
Thanks: 109
Fixes: 4
Registered: 18-02-2013

Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

I thought i was loosing the plot for a minute, i seem to be getting shifting routes as well..
[tt]dig @212.159.6.9 static.bbci.co.uk

;; ANSWER SECTION:
static.bbci.co.uk. 231 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 259 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 10344 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 22 IN A 23.61.255.219
a1638.g.akamai.net. 22 IN A 23.61.255.216
;; Query time: 29 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:01:29 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk

;; ANSWER SECTION:
static.bbci.co.uk. 866 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 266 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 13692 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 29 IN A 23.212.108.110
a1638.g.akamai.net. 29 IN A 23.212.108.86
;; Query time: 31 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:01:32 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk

;; ANSWER SECTION:
static.bbci.co.uk. 226 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 194 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 10431 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 15 IN A 23.212.108.110
a1638.g.akamai.net. 15 IN A 23.212.108.86
;; Query time: 31 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:01:37 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk

;; ANSWER SECTION:
static.bbci.co.uk. 717 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 252 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 7670 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 9 IN A 23.62.53.67
a1638.g.akamai.net. 9 IN A 23.62.53.49
;; Query time: 30 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:01:40 2014
;; MSG SIZE  rcvd: 175

traceroute 23.61.255.219
traceroute to 23.61.255.219 (23.61.255.219), 30 hops max, 60 byte packets
1  192.168.0.254 (192.168.0.254)  68.000 ms  67.642 ms  67.222 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  18.714 ms  19.005 ms  18.800 ms
3  link-b-central10.ptn-gw02.plus.net (212.159.2.13Cool  21.083 ms  20.966 ms  20.762 ms
4  xe-5-3-0.ptw-cr02.plus.net (212.159.0.110)  20.587 ms  20.472 ms  20.939 ms
5  ae2.ptw-cr01.plus.net (195.166.129.4)  20.762 ms  20.646 ms  20.440 ms
6  * * *
7  a23-61-255-219.deploy.static.akamaitechnologies.com (23.61.255.219)  17.614 ms  17.085 ms  17.819 ms
~ $ traceroute 23.212.108.110
traceroute to 23.212.108.110 (23.212.108.110), 30 hops max, 60 byte packets
1  192.168.0.254 (192.168.0.254)  16.712 ms  16.254 ms  15.872 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  18.564 ms  18.921 ms  18.715 ms
3  link-a-central10.ptn-gw01.plus.net (212.159.2.136)  20.191 ms  20.084 ms  19.879 ms
4  xe-5-3-0.ptw-cr01.plus.net (212.159.0.10Cool  19.958 ms  20.236 ms  20.028 ms
5  te-3-4.car5.London1.Level3.net (217.163.45.181)  21.128 ms te-4-2.car5.London1.Level3.net (217.163.45.249)  21.018 ms *
6  ae-52-52.csw2.London1.Level3.net (4.69.139.120)  20.664 ms  17.609 ms  17.922 ms
7  ae-226-3602.edge3.London1.Level3.net (4.69.166.150)  18.530 ms ae-228-3604.edge3.London1.Level3.net (4.69.166.15Cool  18.291 ms ae-225-3601.edge3.London1.Level3.net (4.69.166.146)  18.697 ms
8  ix-20-0.tcore1.LDN-London.as6453.net (195.219.83.101)  19.491 ms  19.183 ms  19.724 ms
9  if-26-2.tcore2.LDN-London.as6453.net (80.231.62.57)  20.680 ms  20.803 ms  20.695 ms
10  80.231.20.42 (80.231.20.42)  22.464 ms  22.259 ms  22.844 ms
11  a23-212-108-110.deploy.static.akamaitechnologies.com (23.212.108.110)  33.007 ms  33.503 ms  33.383 ms
traceroute 23.62.53.67
traceroute to 23.62.53.67 (23.62.53.67), 30 hops max, 60 byte packets
1  192.168.0.254 (192.168.0.254)  20.364 ms  20.005 ms  19.637 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  18.382 ms  18.532 ms  18.534 ms
3  link-b-central10.ptn-gw02.plus.net (212.159.2.13Cool  20.679 ms  20.571 ms  20.368 ms
4  xe-5-3-0.ptw-cr02.plus.net (212.159.0.110)  20.191 ms  20.458 ms  20.256 ms
5  * * *
6  a23-62-53-67.deploy.static.akamaitechnologies.com (23.62.53.67)  20.235 ms  17.594 ms  17.122 ms

[/tt]
Community Veteran
Posts: 2,274
Thanks: 109
Fixes: 4
Registered: 18-02-2013

Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Just to make sure, i've tested again, is it me or are those routes shifting ?
[tt]dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 670 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 97 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 6782 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 16 IN A 23.62.53.49
a1638.g.akamai.net. 16 IN A 23.62.53.67
;; Query time: 39 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:16:28 2014
;; MSG SIZE  rcvd: 175
pi@resolver ~ $ dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 806 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 97 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 12785 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 19 IN A 23.212.108.110
a1638.g.akamai.net. 19 IN A 23.212.108.86
;; Query time: 29 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:16:39 2014
;; MSG SIZE  rcvd: 175
pi@resolver ~ $ dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 766 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 57 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 12745 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 6 IN A 23.212.108.110
a1638.g.akamai.net. 6 IN A 23.212.108.86
;; Query time: 31 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:17:19 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 122 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 172 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 9485 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 10 IN A 23.212.108.86
a1638.g.akamai.net. 10 IN A 23.212.108.110
;; Query time: 30 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:17:23 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 611 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 281 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 6723 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 11 IN A 23.62.53.49
a1638.g.akamai.net. 11 IN A 23.62.53.67
;; Query time: 30 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:17:27 2014
;; MSG SIZE  rcvd: 175
~ $ dig @212.159.6.9 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 117 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 167 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 9480 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 5 IN A 23.212.108.86
a1638.g.akamai.net. 5 IN A 23.212.108.110
;; Query time: 48 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)
;; WHEN: Sat Mar  1 14:17:28 2014
;; MSG SIZE  rcvd: 175
[/tt]
================================================================================
No shift on open dns... well spotted.
=================================================================================
[tt]dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 408 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 95 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19017 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 11 IN A 23.62.53.49
a1638.g.akamai.net. 11 IN A 23.62.53.67
;; Query time: 29 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:10 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; QUESTION SECTION:
;static.bbci.co.uk. IN A
;; ANSWER SECTION:
static.bbci.co.uk. 408 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 95 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19017 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 11 IN A 23.62.53.49
a1638.g.akamai.net. 11 IN A 23.62.53.67
;; Query time: 30 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:10 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 407 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 94 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19016 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 10 IN A 23.62.53.67
a1638.g.akamai.net. 10 IN A 23.62.53.49
;; Query time: 30 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:11 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 406 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 93 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19015 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 9 IN A 23.62.53.49
a1638.g.akamai.net. 9 IN A 23.62.53.67
;; Query time: 30 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:12 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 406 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 93 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19015 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 9 IN A 23.62.53.49
a1638.g.akamai.net. 9 IN A 23.62.53.67
;; Query time: 29 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:12 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 405 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 92 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19014 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 8 IN A 23.62.53.67
a1638.g.akamai.net. 8 IN A 23.62.53.49
;; Query time: 30 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:13 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 401 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 88 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19010 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 4 IN A 23.62.53.67
a1638.g.akamai.net. 4 IN A 23.62.53.49
;; Query time: 29 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:17 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 399 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 86 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19008 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 20 IN A 23.62.53.67
a1638.g.akamai.net. 20 IN A 23.62.53.49
;; Query time: 118 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:19 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 398 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 85 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19007 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 19 IN A 23.62.53.49
a1638.g.akamai.net. 19 IN A 23.62.53.67
;; Query time: 28 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:20 2014
;; MSG SIZE  rcvd: 175
~ $ dig @208.67.222.123 static.bbci.co.uk
;; ANSWER SECTION:
static.bbci.co.uk. 397 IN CNAME static-bbci.bbc.net.uk.
static-bbci.bbc.net.uk. 84 IN CNAME static.bbci.co.uk.edgesuite.net.
static.bbci.co.uk.edgesuite.net. 19006 IN CNAME a1638.g.akamai.net.
a1638.g.akamai.net. 18 IN A 23.62.53.67
a1638.g.akamai.net. 18 IN A 23.62.53.49
;; Query time: 31 msec
;; SERVER: 208.67.222.123#53(208.67.222.123)
;; WHEN: Sat Mar  1 14:25:21 2014
;; MSG SIZE  rcvd: 175
[/tt]
Community Veteran
Posts: 1,840
Thanks: 102
Fixes: 6
Registered: 21-01-2013

Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Quote from: 11110_110
Just to make sure, i've tested again, is it me or are those routes shifting ?


I think the problem there is, each plusnet dns IP has something like 4 caches.
You would think the short ttl of these cdn servers would even things out and all the caches would hold the same IP's, unfortunately this never seems to happen.
The easiest answer is not to use PN's dns.  Undecided
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

As we should all know by now, there are 4 different servers behind each of the 6.9 6.10 13.49 13.50 IP addresses.
6.113 - short www.amd.com = 23.61.255.232
6.114 - short www.amd.com = 23.61.251.10
6.117 - long www.amd.com = 77.67.40.50
6.118 - short www.amd.com = 23.62.3.41
So it seems only 1 out of the 4 PTN DNS servers is giving out IP addresses that send your traffic a longer way.
Testing the other lot (PCL) from a PTN / PTW gateway might not be fair, but:
6.129 - long
6.130 - short
6.131 - short
6.132 - long
2 out of the 4 PCL DNS servers giving IP addresses with longer routes.
I would have thought this would be directing a lot of traffic away from Plusnet's own Akamai IPs and through Level3 etc. instead.
Edit: I'm not sure exactly when this started, maybe since Feb 24th?
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

After a telephone call interrupting my broadband as usual (which I should probably do something about), I'm now on pcl-ag01, with a different IP address, and can't reproduce the problem on any of the 8 DNS servers. So perhaps the issue only affects certain gateways.
Community Gaffer
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Were you on a PTN/PTW gateway before?  That would isolate the difference to be being between the different DNS farms.
Kelly Dorset
Broadband Service Manager
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

As the traceroutes show, I was on ptn-ag03, and so was 11110_110 it appears.
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Yes indeed i was, npr was on ptw, but said he was ok
Quote from: npr
Looks like it could be a routing issue to me, bouncing between London and Paris.
OK here:
  2    27 ms    26 ms    25 ms  lo0-central10.ptw-ag01.plus.net
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Now it gets even stranger because it's started happening again, but I haven't changed gateways nor IP addresses. For example:
dig @212.159.6.9 newsimg.bbc.co.uk +noadflag
;; QUESTION SECTION:
;newsimg.bbc.co.uk. IN A
;; ANSWER SECTION:
newsimg.bbc.co.uk. 648 IN CNAME newsimg.bbc.net.uk.
newsimg.bbc.net.uk. 231 IN CNAME news.bbc.co.uk.edgesuite.net.
news.bbc.co.uk.edgesuite.net. 4633 IN CNAME a1733.g.akamai.net.
a1733.g.akamai.net. 27 IN A 23.62.53.67
a1733.g.akamai.net. 27 IN A 23.62.53.58
or
newsimg.bbc.co.uk. 431 IN CNAME newsimg.bbc.net.uk.
newsimg.bbc.net.uk. 70 IN CNAME news.bbc.co.uk.edgesuite.net.
news.bbc.co.uk.edgesuite.net. 5473 IN CNAME a1733.g.akamai.net.
a1733.g.akamai.net. 27 IN A 92.122.123.48
a1733.g.akamai.net. 27 IN A 92.122.123.81
or
newsimg.bbc.co.uk. 757 IN CNAME newsimg.bbc.net.uk.
newsimg.bbc.net.uk. 102 IN CNAME news.bbc.co.uk.edgesuite.net.
news.bbc.co.uk.edgesuite.net. 4583 IN CNAME a1733.g.akamai.net.
a1733.g.akamai.net. 29 IN A 217.212.252.153
a1733.g.akamai.net. 29 IN A 217.212.252.163
traceroute to 217.212.252.153 (217.212.252.153), 30 hops max, 60 byte packets
1  192.168.0.1 (192.168.0.1)  3.176 ms
2  lo0-central10.pcl-ag01.plus.net (195.166.128.182)  21.764 ms
3  link-a-central10.pcl-gw01.plus.net (212.159.2.160)  24.713 ms
4  xe-10-0-0.pcl-cr01.plus.net (212.159.0.192)  21.043 ms
5  xe-11-2-0.edge3.London2.Level3.net (212.187.201.213)  22.542 ms
6  ae-3-3.ebr1.Paris1.Level3.net (4.69.141.86)  38.304 ms
7  ae-71-71.csw2.Paris1.Level3.net (4.69.161.82)  37.791 ms
8  ae-2-70.edge3.Paris1.Level3.net (4.69.168.70)  40.455 ms
9  prs-b7-link.telia.net (213.248.89.189)  75.974 ms
10  prs-bb1-link.telia.net (213.155.132.192)  78.207 ms
11  ffm-bb1-link.telia.net (213.155.132.157)  84.966 ms
12  s-bb3-link.telia.net (80.91.246.211)  107.361 ms
13  hls-b2-link.telia.net (80.91.245.179)  125.700 ms
14  217-212-252-153.customer.teliacarrier.com (217.212.252.153)  121.418 ms
So then:
@212.159.6.129 newsimg.bbc.co.uk = 92.122.123.48
@212.159.6.130 newsimg.bbc.co.uk = 23.62.53.67
@212.159.6.131 newsimg.bbc.co.uk = 92.122.123.81
@212.159.6.132 newsimg.bbc.co.uk = 217.212.252.163
Or is it just that something notices that the 23.6*.*.* servers are maxed out so decides to redirect traffic elsewhere?
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

Who knows... the good lady hasn't reported any problems over the weekend using plusnet-dns. Mainly for browsing though.
Still on ptn-ag03 this way so i've tested the ptn group of servers instead.
[tt]dig @212.159.6.9 newsimg.bbc.co.uk +noadflag
a1733.g.akamai.net. 27 IN A 23.62.53.58
a1733.g.akamai.net. 27 IN A 23.62.53.67
a1733.g.akamai.net. 8 IN A 23.61.251.11
a1733.g.akamai.net. 8 IN A 23.61.255.209
a1733.g.akamai.net. 24 IN A 66.171.231.95
a1733.g.akamai.net. 24 IN A 66.171.231.32
traceroute 66.171.231.95
traceroute to 66.171.231.95 (66.171.231.95), 30 hops max, 60 byte packets
1  192.168.0.254 (192.168.0.254)  26.158 ms  25.705 ms  25.318 ms
2  lo0-central10.ptn-ag03.plus.net (195.166.128.192)  18.693 ms  21.673 ms  21.852 ms
3  link-b-central10.ptn-gw02.plus.net (212.159.2.13Cool  19.128 ms  21.313 ms  21.339 ms
4  xe-5-3-0.ptw-cr02.plus.net (212.159.0.110)  27.225 ms  27.728 ms  27.619 ms
5  195.99.126.182 (195.99.126.182)  25.280 ms  20.770 ms  26.357 ms
6  core1-te-0-9-0-17.faraday.ukcore.bt.net (213.121.193.134)  21.944 ms  20.824 ms  20.514 ms
7  host213-121-193-133.ukcore.bt.net (213.121.193.133)  20.517 ms  20.493 ms  27.092 ms
8  166-49-214-194.eu.bt.net (166.49.214.194)  20.100 ms  20.867 ms  20.171 ms
9  166-49-214-158.eu.bt.net (166.49.214.15Cool  22.239 ms  23.165 ms  20.243 ms
10  ae2-90g.cr1.lhr1.uk.nlayer.net (69.22.139.62)  19.271 ms  19.897 ms  19.975 ms
11  xe-2-3-0.cr1.ams2.nl.nlayer.net (69.22.142.14)  28.233 ms xe-1-0-0.cr1.cdg1.fr.nlayer.net (69.22.142.57)  27.676 ms xe-2-3-0.cr1.ams2.nl.nlayer.net (69.22.142.14)  27.916 ms
12  xe-0-2-0.cr1.fra1.de.nlayer.net (69.22.142.12)  40.947 ms xe-1-0-1.cr1.fra1.de.nlayer.net (69.22.142.11)  34.660 ms  36.865 ms
13  as34164.ae1.cr1.fra1.de.nlayer.net (69.22.139.90)  45.448 ms  45.597 ms  45.963 ms
14  66.171.231.95 (66.171.231.95)  35.754 ms  36.328 ms  34.534 ms
dig @212.159.6.113 newsimg.bbc.co.uk=23.62.53.67
dig @212.159.6.114 newsimg.bbc.co.uk=23.61.255.209
dig @212.159.6.117 newsimg.bbc.co.uk=2.20.183.163
dig @212.159.6.118 newsimg.bbc.co.uk=80.150.192.112[/tt]

Edit: Added
===================PTN============================
[tt]
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.113       18.18/26.48/45.84/10.16/0
212.159.6.114       18.88/19.60/20.94/0.78/0
212.159.6.117       18.83/22.37/30.05/4.11/0
212.159.6.118       18.15/18.64/18.85/0.26/0
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.113       18.59/24.86/31.90/5.41/0
212.159.6.114       18.13/18.56/18.82/0.30/0
212.159.6.117       18.83/19.92/23.89/1.99/0
212.159.6.118       18.21/19.50/20.78/0.65/1
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.113       18.22/18.60/19.56/0.49/0
212.159.6.114       18.58/19.00/19.59/0.37/0
212.159.6.117       18.35/19.90/22.06/1.49/0
212.159.6.118       18.20/21.78/26.61/3.29/0
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.113       18.45/21.46/26.64/3.53/0
212.159.6.114       17.62/20.07/24.79/2.55/0
212.159.6.117       17.97/18.64/19.98/0.70/0
212.159.6.118       18.34/18.89/20.07/0.69/0[/tt]
=================PCL========================
[tt]
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.129       18.23/18.61/19.04/0.28/0
212.159.6.130       18.37/19.70/22.81/1.75/0
212.159.6.131       17.97/18.74/20.68/0.99/0
212.159.6.132       18.87/19.55/21.17/0.83/0
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.129       17.74/18.25/18.65/0.32/0
212.159.6.130       18.04/18.15/18.23/0.06/0
212.159.6.131       17.71/19.73/24.26/2.37/0
212.159.6.132       18.66/19.03/19.54/0.32/0
Nameserver           Response Time (ms)
                    min/avg/max/stdev/retries
212.159.6.129       17.92/18.13/18.43/0.18/0
212.159.6.130       17.99/19.21/20.71/1.03/0
212.159.6.131       18.03/20.31/26.53/3.46/1
212.159.6.132       18.75/19.43/20.41/0.56/0
Nameserver           Response Time (ms)
                      min/avg/max/stdev/retries
212.159.6.129       18.25/18.49/18.78/0.21/0
212.159.6.130       17.99/18.39/19.39/0.50/0
212.159.6.131       18.04/22.60/28.41/4.11/0
212.159.6.132       18.70/23.37/28.27/3.87/0[/tt]
Looks pretty much the same, jumpy!
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

I've not seen this since about 5am on 6th March, which is probably about the same time or a few hours after the recent DNS timeout issue was fixed.
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

There are some new IP addresses for Akamai now.
The IP addresses being returned for Akamai edgesuite hosted sites seems to be flipping between the new 212.56.73.* addresses and the old 23.6*.*.* addresses. Possibly 6.129 and 6.130 return the new 212.56.73.* IPs and 6.131 and 6.132 the older ones, although that may not be completely consistent. (From pcl-ag02). Also got an occasional further out result such as 23.215.60.141.
Plusnet Alumni (retired) paulmh5
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Re: Plusnet's DNS giving out different IPs with longer routes for Akamai

The results you get back are based on whatever Akamai provide to our DNS server when they query upstream.
The 212.56.73.x addresses are part of a local cache however Akamai are not always preferring that due to some balancing metrics in their world which we are trying to iron out.
Plusnet Staff - Lead Network Design/Delivery Engineer