On 16/06/19 14:31, Mark Andrews wrote:
No. Treating no response as anything other than packet loss leads to lookups
failing when it is packet loss.
That makes sense - thank you
Mark
-- Mark Andrews
On 16 Jun 2019, at 23:10, Sebastian Arcus<s.ar...@open-t.co.uk> wrote:
On 16/06/19 12:37, Mark Andrews wrote:
The servers for this zone are broken, they do not respond to queries with DNS
COOKIE options present. You can add server options to named.conf to work around
this while Barclays fix their servers / firewalls. Modern recursive servers are
no longer working around broken servers that do not respond to queries. See
DNS flag day. It looks like Barclays ignored the messages.
e.g. server 157.83.102.245 { send-cookie false; };
Thank you for that - that is very helpful. Is there a named.conf option to
leave the cookie support turned on, but for Bind to retry a query without
cookies if it fails with cookies attached?
% dig federate-secure.glbaa.barclays.com @ns21.barclays.com +nocookie
; <<>> DiG 9.15.0 <<>> federate-secure.glbaa.barclays.com @ns21.barclays.com
+nocookie
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47102
;; flags: qr aa rd ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;federate-secure.glbaa.barclays.com. IN A
;; ANSWER SECTION:
federate-secure.glbaa.barclays.com. 30 IN A 157.83.96.50
;; Query time: 491 msec
;; SERVER: 157.83.102.245#53()
;; WHEN: Sun Jun 16 21:03:48 AEST 2019
;; MSG SIZE rcvd: 79
% dig federate-secure.glbaa.barclays.com @ns21.barclays.com
; <<>> DiG 9.15.0 <<>> federate-secure.glbaa.barclays.com @ns21.barclays.com
;; global options: +cmd
;; connection timed out; no servers could be reached
%
On 16 Jun 2019, at 6:43 pm, Sebastian Arcus<s.ar...@open-t.co.uk> wrote:
I have discovered Friday that the following domain used by Barclays bank in UK
doesn't resolve properly - but only on some of my servers running Bind:
federate-secure.glbaa.barclays.com
It works on a server with v9.12.3, but it fails on a server with v9.11.0 and
another one with v9.14.2. However, I don't think that the Bind version has
anything to do with it. All servers are recursive servers.
It also resolves fine if I point to Google dns servers.
I've ran tests on the domain above using the MX Toolbox dns checker
(mxtoolbox.com), and it fails with the following errors:
3 ns22.barclays.net 157.83.102.246 TIMED-OUT 518 ms , rcode=NO_DATA
3 ns21.barclays.com 157.83.102.245 TIMED-OUT 509 ms , rcode=NO_DATA
3 ns23.barclays.com 157.83.126.245 TIMED-OUT 504 ms , rcode=NO_DATA
3 ns24.barclays.net 157.83.126.246 TIMED-OUT 517 ms , rcode=NO_DATA
I've had to temporarily disable and bypass the local Bind instance on this
server and point to Google dns, as users couldn't use online banking from
Barclays because of the issue above.
Does anybody have any idea why would it work on some servers and with Google
dns, but not on other servers with Bind? Also, would someone mind trying to
resolve the above domain at their end and see if they get the same errors
please.
Any suggestions appreciated. Thank you.
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