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DNS Synch issues?

Superuser
Superuser
Posts: 11,924
Thanks: 3,286
Fixes: 22
Registered: 22-08-2007

DNS Synch issues?

Hi Guys,
I've been watching for the 'availability' of a new DNS name - www.halton.camra.org.uk - with great anticipation which was made 'live' yesterday.
Google 8.8.8.8 had this address resolved by late yesterday afternoon.  The first sign of this on PN DNS servers was 02:15 this morning (4th Feb).
This morning I again tried to go to the site and got 'address not found'.  I did a nslookup and immediately got a resolution.  I tired again to browse to the page and got site not found.  I did the windows configuration check which reported no issues.  Tried the page again and got the error, tired again and it was all OK.
Rather looks like some of the physical DNS servers behind the virtual DNS address are a bit behind some others - is there a way of looking at when this URL first became known on each physical server which might point to system issues please?

Cheers,
Kevin
24 REPLIES
Superuser
Superuser
Posts: 11,924
Thanks: 3,286
Fixes: 22
Registered: 22-08-2007

Re: DNS Synch issues?

Update... just did some more checking - the following carries on from my FIRST successful nslookup mentioned in post #1

C:\Users\Kevin>nslookup
Default Server:  dsldevice.lan
Address:  192.168.1.254
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
Non-authoritative answer:
Name:    dev.camrapubs.org.uk
Address:  109.123.122.221
Aliases:  www.halton.camra.org.uk
          www.camrabeerengine.org.uk
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
Non-authoritative answer:
Name:    dev.camrapubs.org.uk
Address:  109.123.122.221
Aliases:  www.halton.camra.org.uk
          www.camrabeerengine.org.uk
>

Resolution - 12x non-resolution - resolution.
Something appears to be amiss with the DNS servers!
Community Veteran
Posts: 1,841
Thanks: 103
Fixes: 6
Registered: 21-01-2013

Re: DNS Synch issues?

From here:
It's ok using my dns resolver (root servers) and using google dns.
Opendns gives a different IP address -- have you changed the IP very recently?
Plusnet dns does not give an address.  Undecided
Superuser
Superuser
Posts: 11,924
Thanks: 3,286
Fixes: 22
Registered: 22-08-2007

Re: DNS Synch issues?

Hope this helps - more diagnostics with debug set...
The first two failures (red & blue) reference ns0.demon.co.uk
The third failure (purple) references also ns.hosteurope.com which delivers more information, but not a resolution
The fourth attempt delivers success, even though also using ns0.demon.co.uk
The inconsistency of the search profile and results is disconcerting!

Quote
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 114, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 115, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 116, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = A, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 4034 (1 hour 7 mins 14 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 117, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 4034 (1 hour 7 mins 14 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain

> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 118, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 119, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 120, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = A, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 1919 (31 mins 59 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 121, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 4032 (1 hour 7 mins 12 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain

> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 122, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 123, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 124, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = A, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 4030 (1 hour 7 mins 10 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 125, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 2,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = AAAA, class = IN
    ANSWERS:
    ->  www.halton.camra.org.uk
        canonical name = www.camrabeerengine.org.uk
        ttl = 317 (5 mins 17 secs)
    ->  www.camrabeerengine.org.uk
        canonical name = dev.camrapubs.org.uk
        ttl = 4424 (1 hour 13 mins 44 secs)
    AUTHORITY RECORDS:
    ->  camrapubs.org.uk
        ttl = 13634 (3 hours 47 mins 14 secs)
        primary name server = ns.hosteurope.com
        responsible mail addr = hostmaster.camrapubs.org.uk
        serial  = 2012050201
        refresh = 86400 (1 day)
        retry  = 3600 (1 hour)
        expire  = 1209600 (14 days)
        default TTL = 14400 (4 hours)
------------
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain

> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 126, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 127, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 128, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 3,  authority records = 0,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = A, class = IN
    ANSWERS:
    ->  www.halton.camra.org.uk
        canonical name = www.camrabeerengine.org.uk
        ttl = 305 (5 mins 5 secs)
    ->  www.camrabeerengine.org.uk
        canonical name = dev.camrapubs.org.uk
        ttl = 4412 (1 hour 13 mins 32 secs)
    ->  dev.camrapubs.org.uk
        internet address = 109.123.122.221
        ttl = 4412 (1 hour 13 mins 32 secs)
------------
Non-authoritative answer:
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 129, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0
    QUESTIONS:
        www.halton.camra.org.uk, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  camra.org.uk
        ttl = 1905 (31 mins 45 secs)
        primary name server = ns0.demon.co.uk
        responsible mail addr = hostmaster.demon.net
        serial  = 2012103080
        refresh = 10800 (3 hours)
        retry  = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 7200 (2 hours)
------------
Name:    dev.camrapubs.org.uk
Address:  109.123.122.221
Aliases:  www.halton.camra.org.uk
          www.camrabeerengine.org.uk
Superuser
Superuser
Posts: 11,924
Thanks: 3,286
Fixes: 22
Registered: 22-08-2007

Re: DNS Synch issues?

Quote from: npr
From here:
It's ok using my dns resolver (root servers) and using google dns.
Opendns gives a different IP address -- have you changed the IP very recently?
Plusnet dns does not give an address.  Undecided

Hi npr,
Thank you for the helpful input - in answer to your questions...
I've seen the resolution of this name progress over the last 18 hours myself, first seen on 8.8.8.8 (but not 4.4.4.4) late yesterday afternoon.  I first saw PN resolution of this address 02:15 today.  This morning I could not connect.  The above diagnostics suggest (at least) an inconsistency across PN servers.
Yes CAMRA (Campaign for Real Ale) have changed their DNS management from Demon to DNSIMPLE...
Quote
Result of WHOIS query:

Domain name:
    camra.org.uk

Registrant:
    Campaign for Real Ale

Registrant type:
    UK Limited Company, (Company number: 1270286)

Registrant's address:
    230 Hatfield Road
    St Albans
    Hertfordshire
    AL1 4LW
    United Kingdom

Registrar:
    Cable & Wireless Limited t/a Demon Internet [Tag = DEMON]
    URL: http://www.demon.net

Relevant dates:
    Registered on: before Aug-1996
    Expiry date:  28-Jul-2016
    Last updated:  03-Feb-2014

Registration status:
    Registered until expiry date.

Name servers:
    ns1.dnsimple.com
    ns2.dnsimple.com
    ns3.dnsimple.com
    ns4.dnsimple.com

WHOIS lookup made at 09:58:04 04-Feb-2014

So there are two changes in the pot here - a change of DNS management and the addition of a NEW domain name within camra.org.uk
Whatever the state of flux (and I know there will be flux with DNS changes) I would (I think reasonably) expect PN queries to be consistent - either say "we don't yet have the changes" or "all is OK" - not well it depends on which of the 'behind the wall' DNS server services the request!
Cheers,
Kevin
Superuser
Superuser
Posts: 11,924
Thanks: 3,286
Fixes: 22
Registered: 22-08-2007

Re: DNS Synch issues?

Creeping change - two more tests... note reference to CAMRA's new DNS manager.
Quote
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 146, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 0,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 147, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 0,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 148, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 1,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk, type = A, class = IN
   AUTHORITY RECORDS:
   ->  camra.org.uk
       ttl = 7005 (1 hour 56 mins 45 secs)
       primary name server = ns0.demon.co.uk
       responsible mail addr = hostmaster.demon.net
       serial  = 2012103080
       refresh = 10800 (3 hours)
       retry   = 1800 (30 mins)
       expire  = 604800 (7 days)
       default TTL = 7200 (2 hours)
------------
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 149, rcode = NOERROR
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 2,  authority records = 1,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk, type = AAAA, class = IN
   ANSWERS:
   ->  www.halton.camra.org.uk
       canonical name = www.camrabeerengine.org.uk
       ttl = 3400 (56 mins 40 secs)
   ->  www.camrabeerengine.org.uk
       canonical name = dev.camrapubs.org.uk
       ttl = 1420 (23 mins 40 secs)
   AUTHORITY RECORDS:
   ->  camrapubs.org.uk
       ttl = 10630 (2 hours 57 mins 10 secs)
       primary name server = ns.hosteurope.com
       responsible mail addr = hostmaster.camrapubs.org.uk
       serial  = 2012050201
       refresh = 86400 (1 day)
       retry   = 3600 (1 hour)
       expire  = 1209600 (14 days)
       default TTL = 14400 (4 hours)
------------
*** dsldevice.lan can't find www.halton.camra.org.uk: Non-existent domain
> www.halton.camra.org.uk
Server:  dsldevice.lan
Address:  192.168.1.254
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 150, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 0,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk.lan, type = A, class = IN
------------
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 151, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 0,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk.lan, type = AAAA, class = IN
------------
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 152, rcode = NOERROR
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 3,  authority records = 0,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk, type = A, class = IN
   ANSWERS:
   ->  www.halton.camra.org.uk
       canonical name = www.camrabeerengine.org.uk
       ttl = 3398 (56 mins 38 secs)
   ->  www.camrabeerengine.org.uk
       canonical name = dev.camrapubs.org.uk
       ttl = 1418 (23 mins 38 secs)
   ->  dev.camrapubs.org.uk
       internet address = 109.123.122.221
       ttl = 1418 (23 mins 38 secs)
------------
Non-authoritative answer:
------------
Got answer:
   HEADER:
       opcode = QUERY, id = 153, rcode = NXDOMAIN
       header flags:  response, want recursion, recursion avail.
       questions = 1,  answers = 0,  authority records = 1,  additional = 0
   QUESTIONS:
       www.halton.camra.org.uk, type = AAAA, class = IN
   AUTHORITY RECORDS:
   ->  camra.org.uk
       ttl = 1051 (17 mins 31 secs)
       primary name server = ns1.dnsimple.com
       responsible mail addr = admin.dnsimple.com
       serial  = 2014012201
       refresh = 86400 (1 day)
       retry   = 10800 (3 hours)
       expire  = 604800 (7 days)
       default TTL = 300 (5 mins)
------------
Name:    dev.camrapubs.org.uk
Address:  109.123.122.221
Aliases:  www.halton.camra.org.uk
         www.camrabeerengine.org.uk
>

Are my expectations that PN's internal DNS servers be consistent reasonable or is it acceptable that for some undefined duration the correct resolution of a name might be unpredictable within PN's DNS service(s)?
If history tracking is a useful approach, halton.camra.org.uk was registered this morning - it too is showing intermittent resolution / non-resolution.
Will now leave this in PN's hands.

Cheers,
Kevin
Community Gaffer
Community Gaffer
Posts: 17,650
Thanks: 642
Fixes: 162
Registered: 05-04-2007

Re: DNS Synch issues?

Hmm, thanks for the extensive info. I'll see if Dave/Kelly know anything about this.
If this post resolved your issue please click the 'This fixed my problem' button
 Chris Parr
 Plusnet Staff
Community Veteran
Posts: 1,841
Thanks: 103
Fixes: 6
Registered: 21-01-2013

Re: DNS Synch issues?

I've had a dig around and it looks like the problem is a long time to live (TTL) for the old name server (NS) demon.
This together with Plusnet using something like 8 dns caches, some of which hold the new info while some hold the old info. Unfortunately it may take a few days for everything the sort it's self out.
Quote
My note from dig results which may help explain.
Google dns
;; ANSWER SECTION:
www.halton.camra.org.uk. 3600   IN      CNAME   www.camrabeerengine.org.uk.
www.camrabeerengine.org.uk. 14400 IN    CNAME   dev.camrapubs.org.uk.
dev.camrapubs.org.uk.   14400   IN      A       109.123.122.221

;; Query time: 312 msec
;; SERVER: 8.8.8.8#53(8.8.8.8

Opendns
;; QUESTION SECTION:
;www.halton.camra.org.uk.       IN      A
;; ANSWER SECTION:
www.halton.camra.org.uk. 0      IN      A       67.215.65.132
;; Query time: 31 msec
;; SERVER: 208.67.220.220#53(208.67.220.220)
THis is still using demon Name Server -- expires in around 60 hours.

Plusnet dns 212.159.6.9
;; AUTHORITY SECTION:
camra.org.uk.           2376    IN      SOA     ns0.demon.co.uk. hostmaster.demo
n.net. 2012103080 10800 1800 604800 7200
;; Query time: 15 msec
;; SERVER: 212.159.6.9#53(212.159.6.9)

Plusnet dns 212.159.6.10

;; ANSWER SECTION:
www.halton.camra.org.uk. 203    IN      CNAME   www.camrabeerengine.org.uk.
www.camrabeerengine.org.uk. 10299 IN    CNAME   dev.camrapubs.org.uk.
dev.camrapubs.org.uk.   10299   IN      A       109.123.122.221
;; Query time: 31 msec
;; SERVER: 212.159.6.10#53(212.159.6.10)

Looks like plusnet 212.159.6.9 is still querying the old "demon" domain NS.
Using the following command to check the NS
dig NS www.halton.camra.org.uk @212.159.6.9
Roughly 9 put of 10 times it gives
ns.hosteurope.com. and hostmaster.cmrapubs.org.uk.
1 in 10 it gives:
ns0.demon.co.uk. and hostmaster.demon.net.
TTL expires in around 14 hours in the worst cached (TTL) I've seen.


Edit 1pm
Plusnet dns now giving me the correct IP every time.
Community Gaffer
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Re: DNS Synch issues?

I've seen a different DNS problem over the last couple of days that's been reported too, so have dropped a note to the engineering guys to look.
If this post resolved your issue please click the 'This fixed my problem' button
 Chris Parr
 Plusnet Staff
Superuser
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Re: DNS Synch issues?

Chris,
Thank you for passing on.
npr,
Thank you for your detailed analysis, though a bit beyond (even dare I say) my technical grasp!
Whilst I understand that it can take 24-72 hours for the whole of the internet to get these kind of changes sorted out, is it unreasonable to expect that if (at least) one of the PN virtual DNS platforms has the new info, they should all have it?  Or is this a 'characteristic' of autonomous / resilient configuration of individual DNS caches?
Cheers,
Kevin
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Re: DNS Synch issues?

Quote from: Townman
is it unreasonable to expect that if (at least) one of the PN virtual DNS platforms has the new info, they should all have it?  

I think it's a very reasonable expectation.
I gave up on PN's dns some time ago Sad
To be fair though, part of the problem is waiting for the old TTL to expire.
Also opendns have still to pick up the correct IP address. (hopefully in the next 30 minutes Wink
Community Veteran
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Re: DNS Synch issues?

Just had another look at your dns issue.
Although plusnet and google are still resolving your site other resolvers are giving very strange results.
May be worth rechecking your domain record at dnsimple.com.
That is the NS for the domain camra.org.uk so I would have expected it to be the NS for the host www.halton.camra.org.uk, it appears no to be.  Undecided
Superuser
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Re: DNS Synch issues?

@npr,
Thank you.  Can you provide a bit more detail please as I will need to pass ths information on to CAMRA.
I'm just the owner of a branch web site using their hosting vehicle and domain management service..
Cheers,
Kevin.
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Re: DNS Synch issues?

Much of the weirdness I was seeing from the dig command had corrected it's self by late last night. So the dns change may have just been slow to propagate.
As far as I can see this morning there is just opendns which is not finding your site.
In the opendns members centre you an see what the different caches around the world holds for  a name, around half holds the correct IP (109.123.122.221)  the other half hold (67.215.65.132). So I think we just need to wait a while longer and thing should correct themselves.
Can anyone else who uses opendns confirm this site is not working for them?
Edit:
A list showing the IP address held for "www.halton.camra.org.uk" in diferent opendns caches around Europe.
I've posted this cos I found it interesting and also I've just learnt / testing how to post tables Smiley
                                               
Europe
Amsterdam, The Netherlands   
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221
Berlin, Germany
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221   
Bucharest, Romania
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221
Copenhagen, Denmark
67.215.65.132
Frankfurt, Germany
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221   
London, England
67.215.65.132
Paris, France
67.215.65.132
Prague, Czech Republic
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221   
Warsaw, Poland
    dev.camrapubs.org.uk
    www.camrabeerengine.org.uk
    109.123.122.221   

Community Veteran
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Re: DNS Synch issues?

I have it working from 208.67.222.123 hmm.....
sudo unbound-control lookup www.camrabeerengine.org.uk
The following name servers are used for lookup of www.camrabeerengine.org.uk.
forwarding request:
Delegation with 0 names, of which 0 can be examined to query further addresses.
It provides 2 IP addresses.
208.67.222.123   not in infra cache.
208.67.220.123   not in infra cache.
And about:config.... browser.cache.disk.enable;false
Very Fast might i add as well Smiley
Edit: I should have checked the url a little closer, thats a no then. www.halton.camra.org.uk ;  Lips are sealed