On Fri, Dec 10, 2010 at 8:43 AM, Steve Clark <sclark at netwolves.com> wrote: > Hi, > > I have a confusing problem. I have two centos 5,5 boxes. Both have > sudo.i386 1.7.2p1-9.el5_5 > installed > > I am using the same sudoers file, but the one on box A keeps trying to do > DNS lookups > while the one on box B does not. How do I disable this DNS lookup? > > Thanks for any info. It's probably looking up the hostname of the host you're on, to match against host informaiton in sudoers entries. Do you have your hostname and IP address in /etc/hosts on each machine? And do you have fully qualified hostnames, matching the entries in /etc/hosts?