Hi David, 1) I my case the primary dns server had a failure I was able to repair but *I* was on vacation and the helpdesk operator did not have the proper permissions/knowlege. For all other operations this was no problem as any of the other 4 dns servers were able to take over and it was a low priority event. That is, until we realised mai was flowing extreem slow. :-(
2) Normal behaviour for a dns resolver is to try the next dns server after a delay of 2 sec. When there are more then two dns servers and the second does not answer as well the timeout round robin gets a bit more complicated on a full scale situation. For Declude it might be a bit more simple. First 2sec timeout, just try the next dns server. Second to .... (tenth?) failure, same behaviour but keep track. After that mark the active dns server as the first one to be attempted and every 100? attempts check to see if the first dns server has come back. If the first dns server responds to queries once more switch back as there is probably a good reason we marked is as the first dns server. A simple fail over mechanism might be enough for most of us. I think very few of us have more then two dns servers defined in the setup of any machine. Met vriendelijke groet, Bonno Bloksma senior systeembeheerder tio hogeschool hospitality en toerisme begijnenhof 8-12 / 5611 el eindhoven t 040 296 28 28 / f 040 237 35 20 b.blok...@tio.nl / www.tio.nl ----- Original Message ----- From: David Barker To: declude.junkmail@declude.com Sent: Tuesday, July 06, 2010 5:54 PM Subject: RE: [Declude.JunkMail] dns servers for declude Hi Bono, We can look at adding a second DNS entry to declude. 1. What was your DNS failure ? 2. Under what circumstances would you want Declude to switch to the secondary DNS server ? Does anyone have ideas as to what this should look like so that I can scope the requirement. Thanks David From: supp...@declude.com [mailto:supp...@declude.com] On Behalf Of Bonno Bloksma Sent: Sunday, July 04, 2010 4:37 AM To: Declude.JunkMail@declude.com Subject: [Declude.JunkMail] dns servers for declude Hi, I have 5 sites and 5 dns servers. Each is primary for it's own site and secondary for another site. I can survive any single dns server failure except.... when it comes to Declude. A long time ago we were told Declude does not properly follow the Windows settings for primary, secondary and if neccesary tertiary dns server and we needed to provide ONE dns server in the Declude config. After a Declude upgrade a while ago I started with a fresh default config file and noticed the dns settings were comented so I left them at that and assumed Declude would one again use the same dns servers Windows has configured. Unfortunately the dns server reponsible for the site where the mailserver is failed yesterday for most of the day after a problem during maintenance. The secondary server took over for just about all servers / services except the Declude service. Mail was realy slow of course. :-( Is the problem that prevented us in the past from defining more then one dns server finaly resolved? Can I have a secondary dns server in Declude today? If not now, when can I? I know I can solve the problem for Declude by using a cluster of dns servers with one public ip-number but.... I have not done anything with clusters yet and: - my current dns servers have a load of close to nothing - my current dns servers are also my Active Directory DCs Yes, we will have virtual servers pretty soon too so I can have fast fail over on the dns server But... What if I want to do a fail over to my backup site? The mail server might still want to use the dns server at my primary site which will probably have a problem because I have switched to the backup site. Any clustering of dns servers at my primary site would then still be usesless. I simply want Declude to use any of the 5 dns servers I have today. Met vriendelijke groet, Bonno Bloksma senior systeembeheerder tio hogeschool hospitality en toerisme begijnenhof 8-12 / 5611 el eindhoven t 040 296 28 28 / f 040 237 35 20 b.blok...@tio.nl / www.tio.nl --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com. --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com. --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
