RE: Programmatically Pull the IP Address of The iSeries

I thought the way that the iSeries Cluster worked in a failover situation
was for the failover system to assume the address of the failed system.
Otherwise the DNS would have to be changed to start sending out the failover
systems address.  

In order to get the IP address of the iSeries, I'd use the following api
calls:

int gethostname(char *name, int length) - get host name set in CFGTCP Opt 12

struct hostent *gethostbyname(char *host_name) - resolves the name to a list
of 32 bit addresses and a list of alias names

char *inet_ntoa(struct in_addr internet_address) - translate 32 bit address
to its dotted decimal form.

You still have to figure out which of the addresses to use if your systems
name resolves to more than one address - I usually opt for the first one.

Kurt

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Wednesday, July 19, 2006 2:08 PM
To: Midrange Systems Technical Discussion
Subject: RE: Programmatically Pull the IP Address of The iSeries

<snip>
When we are role swapped, the file needs to go to the DR iSeries.
</snip>
Excuse me, but we're looking at DR also.  Wouldn't the DR iSeries change
in some other fashion?  Like, the DNS now serve the backup i5 and not the
primary?  So, that if you ping myi5 instead of getting 10.10.1.5 you might
now get 10.10.1.6?  Isn't this how it should work?  Well, I suppose both
addresses could be configured on both boxes and the interface just not
started would be an alternative.  In summary I am saying that there has to
be a better way.  Otherwise, imagine changing a few thousand emulation
sessions on about that many pc's to now point to the backup system.  Not
really a plan that could be implemented in minutes, right?

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com


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