On Fri, Dec 10, 2010 at 2:23 PM, Steve Clark <sclark at netwolves.com> wrote: > On 12/10/2010 10:40 AM, Tom H wrote: > On Fri, Dec 10, 2010 at 8:43 AM, Steve Clark <sclark at netwolves.com> wrote: >>> >>> 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? >> >> Do both hosts have their hostnames in "/etc/hosts"? >> >> Do both hosts have "hosts: files dns" in "/etc/nsswitch.conf"? > > I have resolved the problem as far why they behaved differently. > Someone had put an entry in /etc/resolv.conf when normally we run our > own nameserver at 127.0.0.1. > Putting a hostname and address in the /etc/hosts also fixed the problem. > > But I still don't understand why it wants to do a DNS lookup when I don't > have > Defaults fqdn > in the sudoers file. A WAG: Since sudo rights are assigned on a box by box basis (unless you use "ALL"), sudo has to check on which box you are running it.