On Sep 27, 2011, at 11:29, John Hodrien wrote: > You probably want to do an strace -f host blah rather than a basic strace, or > I think you'll lose what's going on. Good point. Using -f doesn't show a 3+ second gap, but I still have no idea why it's slow (3-5 seconds) compared to CentOS5, or why using ltrace causes host or nslookup to crash. Can anybody else get ltrace to work with host? > Are you running either sssd or nscd on your box? Yes, I am running nscd, but I didn't think it cached DNS queries. > I've done nothing special, and DNS seems fast enough. And I have done nothing different than what I do in CentOS5, yet it is much slower (by at least an order of magnitude). On Sep 27, 2011, at 13:05, Frank Cox wrote: > Have you considered installing dnsmasq on those machines? No, this is in a corporate environment, and the queries that are slow are for names outside of our domain (i.e., the Internet), so I don't think it would help. Any other ideas on how to diagnose the root cause? Alfred