Oracle RAC requires permissions to networking components which are typically restricted on most systems. Most notable are permissions to utilities SSH, PING, and RSH. If you are attempting to install Oracle RAC software and you are receiving failures in communications; check the permissions of these utilities for a possible cause.

1. Logon to your Linux server as root.

2. Change the permissions on the following files to u+s.

chmod u+s /bin/ping
chmod u+s /usr/bin/ssh
chmod u+s /usr/bin/rsh

This completes allowing Oracle permissions to SSH, PING, and RSH for RAC configurations.
Larry J. Catt, OCP 9i, 10g
oracle@allcompute.com
www.allcompute.com