Arno wrote:
First you have to figure where the problem is: nscd or dnscache. If it's nscd (and from a little googling about nscd and "round robin dns" I get the impression that nscd does not have a clue about round robin), disable the caching of hosts in /etc/nscd.conf.
It's not nscd. Ignore whatever you found through google. Then nscd man page will tell you that it is a caching service for glibc's get*() type lookups. Those functions don't provide for anything other than simple name lookups, and can't be used to locate MX records in DNS.
You can keep nscd around. It's especially useful if you're using NIS or LDAP as a name service.
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