Re: The OpenLDAP Client and Multiple DNS Records

[Howard Chu <hyc@symas.com>]

George Holbert wrote:
> Tim Gustafson wrote:
> > Hi,
> >
> > How does the OpenLDAP client library handle multiple A records being returned for a DNS query for an LDAP server?

> OpenLDAP doesn't alter hosts resolution behavior.
> As usual, the first address (A record) returned would be used.
>
> > That is to say, if "host ldap" returns 1.1.1.1, 2.2.2.2 and 3.3.3.3, will the OpenLDAP client library only connect to 1.1.1.1?  If a connection to 1.1.1.1 fails, will it try 2.2.2.2 and then 3.3.3.3?
>
> It will not try 2.2.2.2 or 3.3.3.3 automatically if a connection attempt
> to 1.1.1.1 fails.
> It might happen to try them on the next connection, if the host needs to
> resolve the LDAP server's name again, and either 2.2.2.2 or 3.3.3.3 is
> the first A record returned.

False. If multiple A records are returned, if the first address fails it will 
continue on to the next, stopping when something succeeds or it runs out of 
alternatives.

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/