swinog August 2016

swinog@lists.swinog.ch

22 participants
14 discussions

'known' DNS Problems with Migros Banking App?
by Benoit Panizzon 09 Aug '16

09 Aug '16

Hello One customer contacted us, because the Migros Banking App does not work from within our network and asked me to contact the Migros NOC to find out what we should change to make it work. From the Migros NOC I got the feedback, that this is an issue they observed with customers whose ISP have IPv6 enabled DNS Server. They recommend that either the ISP disables IPv6 on the nameservers, or that the customers uses a different ISP, for example via Mobile Phone Hotspot to use their Banking app. Apparently UPC Cablecom is another ISP with the same issue and cablecom is able to resolve the issue by disabling IPv6 for the affected customers. I am a bit puzzled. I first suspected a DNSSEC issue as our servers do validate DNSSEC. But this does not seem to be the case. I can resolve the hostnames without any problems via our DNS Servers. Our DNS Servers are IPv6 enabled. When another DNS Server has an IPv6 address, they will prefer IPv6. But our customer does not get an IPv6 address. So his local resolver does only know the IPv4 address of our DNS Servers. The Migros DNS Servers do not publish an IPv6 address. So how is IPv6 involved in this issue? The Domain in Question: mbmid.ch is: mbmid.ch. 241 IN NS ns1.datacenter-migros.ch. mbmid.ch. 241 IN NS migze104.migros.ch. mbmid.ch. 241 IN NS migze100.migros.ch. ns1.datacenter-migros.ch. 146 IN A 164.14.130.66 migze100.migros.ch. 3222 IN A 146.67.146.20 migze104.migros.ch. 3222 IN A 193.8.177.201 They are not DNSSEC Signed. The only issue I found is that ns1.datacenter-migros.ch is not published in the registrar glue record, but this also would not lead to a failure to resolve the hostname. Has anyone else come across that issue and could give me a hint where to further investigate? -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

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Re: [swinog] Rack mounting Switch/Routers in Cold and Hot Isle DC
by Robert.Guentensperger＠swisscom.com 05 Aug '16

05 Aug '16

Hi Patrick better airflow vs. nice/easy cabling better airflow = less HW issues = less impact = equip. lives longer = saves finally money nice/easy cabling = nice to see = less cable problems = faster changes/troubleshooting on HW-side So my vote is clear for better airflow. Cheers, Günti > -----Original Message----- > From: swinog-bounces(a)lists.swinog.ch [mailto:swinog- > bounces(a)lists.swinog.ch] On Behalf Of Patrick Studer > Sent: Friday, August 05, 2016 2:31 PM > To: swinog(a)lists.swinog.ch > Subject: ***Signed_Message*** Re: [swinog] Rack mounting Switch/Routers > in Cold and Hot Isle DC > > Hi > > Thanks for all the input. > > Unfortunately, my questions seems not to be clear enough. > > I know, how to solve the issue. > > I just wanted to know, if anybody is strictly following the best > practice for the airflow or if some ignore the best practice in place > for a proper cabling (and perhaps just leaves an additional U free for > airflow)? > > Or in other words, which option count more (better airflow vs. nice/easy > cabling). > > Kind regards > > Patrick Studer > > ************************************************************************ > **** > ** > X-NetConsulting GmbH Internet http://www.x- > netconsulting.ch Nauenstrasse 49 E- > Mail p.studer(a)x-netconsulting.ch > CH-4052 Basel Telefon +41 61 315 85 55 > Schweiz Fax +41 61 315 85 59 > ************************************************************************ > **** > ** > > > -----Ursprüngliche Nachricht----- > Von: swinog-bounces(a)lists.swinog.ch [mailto:swinog- > bounces(a)lists.swinog.ch] > Im Auftrag von Gregor Riepl > Gesendet: Donnerstag, 4. August 2016 23:16 > An: swinog(a)lists.swinog.ch > Betreff: Re: [swinog] Rack mounting Switch/Routers in Cold and Hot Isle > DC > > > How to you solve this issue? > > The easiest solution, if there is no fancy (i.e. software controlled) > way to reverse fan flow: > > Just open the switch, unscrew the fans, turn them around and remount > them. > > Our network engineer did that countless times, and it always works. > > No need to spend heaps of $$$ on hardware with the "correct" flow > direction. > > > _______________________________________________ > swinog mailing list > swinog(a)lists.swinog.ch > http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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Rack mounting Switch/Routers in Cold and Hot Isle DC
by Patrick Studer 05 Aug '16

05 Aug '16

Hi I'm interested, how swinog members mount their (switch/router/firewall) equipment in a hot/cold isle environment. In theory, one should mount the switches/routers in front (toward cold isle) of the rack to have an optimal airflow, but then cabling get a little bit messy. If this type of equipment is mounted in the back (toward hot isle), the cabling can be done much cleaner, but the airflow isn't optimal and in worst case, switches and routes take in hot air from other devices. How to you solve this issue? Thanks for you valuable input. Kind regards Patrick Studer **************************************************************************** ** X-NetConsulting GmbH Internet <http://www.x-netconsulting.ch/> http://www.x-netconsulting.ch Nauenstrasse 49 E-Mail <mailto:p.studer@x-netconsulting.ch> p.studer(a)x-netconsulting.ch CH-4052 Basel Telefon +41 61 315 85 55 Schweiz Fax +41 61 315 85 59 **************************************************************************** **

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Re: [swinog] Rack mounting Switch/Routers in Cold and Hot Isle DC
by Jerome.Tissieres＠swisscom.com 04 Aug '16

04 Aug '16

Hi Patrick, In many datacenter switches, at least the good ones, you can choose the fan direction (front-to-back or back-to-front) and this solve this problem. Cheers, Jerome From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch] On Behalf Of Patrick Studer Sent: Thursday, 4. August 2016 09:17 To: swinog(a)swinog.ch Subject: [swinog] Rack mounting Switch/Routers in Cold and Hot Isle DC Hi I'm interested, how swinog members mount their (switch/router/firewall) equipment in a hot/cold isle environment. In theory, one should mount the switches/routers in front (toward cold isle) of the rack to have an optimal airflow, but then cabling get a little bit messy. If this type of equipment is mounted in the back (toward hot isle), the cabling can be done much cleaner, but the airflow isn't optimal and in worst case, switches and routes take in hot air from other devices. How to you solve this issue? Thanks for you valuable input. Kind regards Patrick Studer ****************************************************************************** X-NetConsulting GmbH Internet http://www.x-netconsulting.ch<http://www.x-netconsulting.ch/> Nauenstrasse 49 E-Mail p.studer(a)x-netconsulting.ch<mailto:p.studer@x-netconsulting.ch> CH-4052 Basel Telefon +41 61 315 85 55 Schweiz Fax +41 61 315 85 59 ******************************************************************************

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swinog August 2016