General Info/DNS

DNS Suffix

To add a DNS suffix to linux - CentOS

http://unix.stackexchange.com/questions/193893/append-dns-suffixes-to-etc-resolv-conf
edit /etc/sysconfig/network

DOMAIN=example.com
OR
DOMAIN="example.com sub.example.com"

To add a search domain to Mac OSX

Apple calls a DNS suffix a Search domain.

Apple Menu > System Preferences > Network
Select Network adapter > Advanced
DNS > Search Domain list > (+) Add domain