Raj, [Sudhi] Sqlplus "/ as sysdba" Sql> oradebug setmypid Sql> oradebug ipc Sql> oradebug tracefile_name The resulting tracefile will contain the protocol being used by the interconnect. Thanks, -Sudhi. Hi All, How to find which protocol is being used in my RAC. (i guess it was UDP or LLT being used as told by someone.) Where to check it ? Thanks, Raj _____ Start <http://us.rd.yahoo.com/evt=34442/*http:/www.yahoo.com/r/hs> your day with Yahoo! - make it your home page