configuring oracle 11gR2 scan and troubleshooting nslookup hang

Today I was implement the scan IP for Oracle Grid 11gR2 and my nslookup tesst were hanging. Turns out I just need to add entries into my /etc/resolv.conf for lookups.

Here is an example of my resolve.conf
search mycompany.com
nameserver 4.x.x.x

There is a good note explaining setup of the SCAN IP for 11gR2. The note is 11gR2 Grid Infrastructure Single Client Access Name (SCAN) Explained [ID 887522.1].

Below is a summary of the note.
Single client access name (SCAN) is the virtual name to provide for all clients connecting to the cluster instead of using server-vip addresses.

SCAN is a domain name registered to at least one and up to three IP addresses, either in the domain name service (DNS) or the Grid Naming Service (GNS).

SCAN name must be unique to your network and at least one character long and no more than 15 characters in length, must be alphanumeric - cannot begin with a numeral and may contain hyphens (-). If you require a SCAN that is longer than 15 characters, then select an Advanced installation.

SCAN VIP addresses must be on the same subnet as virtual IP addresses and public IP addresses.

Don't use /etc/hosts to resolve SCAN, use DNS or GNS.