Ahh, if only.... Unfortunately we (apparently) don't have the network infrastructure in place to allow these 2 machines to share a virtual IP address.
Regarding DNS TTLs, does the channel really do something more sophisticated than gethostbyname() to resolve the address? If not, there doesn't seem to be any information regarding TTLs available to the CHIN (this is z/OS by the way) to tell it to re-resolve and anyway it seems sensible to let your DNS servers deal with that sort of thing. Hopefully the channel is smart enough to try to re-resolve the channel when it finds it can't connect as Margherita said at the beginning. Trouble is, testing DNS changes is not that easy! Thanks for all the help, as usual. Cheers, Paul -----Original Message----- From: Khedr, Hossam (GEI, MORT) [mailto:[EMAIL PROTECTED] Sent: 24 February 2004 14:38 To: [EMAIL PROTECTED] Subject: Re: Channel address resolution We are using cluster server, and we have set up a virtual IP address as a shared IP between the 2 boxes in case of failover. Now the sender channels to those boxes are looking up the shared IP. The cluster server will do the rest for us. I guess you should ask your business partner or admin to give you that virtual IP address. Hope this one helps. Hossam -----Original Message----- From: MQSeries List [mailto:[EMAIL PROTECTED] Behalf Of Chan, Ian M Sent: Monday, February 23, 2004 7:40 PM To: [EMAIL PROTECTED] Subject: Re: Channel address resolution Paul, I think it depends on the TTL from the DNS. Usually it's set at 86400 (1 day). I had experience that the IP address was changed at the DNS and my sender couldn't connect (at MVS MQ v1.2) by using the name after comms failure. Not sure is there any change on MQ 5.3. You can look at the TTL from the DNS response by entering nslookup -q=hinfo <name> Cheers, Ian -----Original Message----- From: MQSeries List [mailto:[EMAIL PROTECTED] Behalf Of Crupi, Margherita Sent: Tuesday, 24 February 2004 10:05 AM To: [EMAIL PROTECTED] Subject: Re: Channel address resolution Paul, It will re-resolve during the next retry. Thanks... -----Original Message----- From: MQSeries List [mailto:[EMAIL PROTECTED] Behalf Of Meekin, Paul Sent: Monday, 23 February 2004 10:38 PM To: [EMAIL PROTECTED] Subject: Channel address resolution Hi List, I have a sender channel connecting to a receiver on a machine which will be changing its IP address during failover as part of a cluster. I'm concerned that my SDR may not lookup the new IP address after a switch. I'm using DNS for the CONNAME but what happens if the SDR channel is active when I lose the RCVR end? If my SDR goes into retry, will it ever attempt to re-resolve the IP address via DNS or will it continue trying the old address unless I manually stop/start it (the machines are on different networks)? Cheers, Paul Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
