http://frednotes.wordpress.com/2012/11/13/reset-dell-idrac-using-ssh/
How to reboot an DELL idrac when web page refuse access:
Connect to idrac IP using ssh with the password refused by web page
$ ssh root@192.168.0.120
root@192.168.0.120's password:
The magic DELL tool is here : radadm
/admin1-> racadm
===============================================================================
RACADM version 1.80 (Build 17)
Copyright (c) 2003-2010 Dell, Inc.
All Rights Reserved
===============================================================================
RACADM usage syntax:
racadm <subcommand> <options>
Examples:
racadm getsysinfo
racadm getsysinfo -d
racadm getniccfg
racadm setniccfg -d
racadm setniccfg -s 192.168.0.120 255.255.255.0 192.168.0.1
racadm getconfig -g cfgLanNetworking
Display a list of available subcommands for the RAC:
racadm help
Display more detailed help for a specific subcommand:
racadm help <subcommand>
------------------------------------------------------------------------------
So to reboot :
/admin1-> racadm racreset soft
RAC reset operation initiated successfully. It may take up to a minute
for the RAC to come back online again.
/admin1-> Connection to 192.168.0.120 closed by remote host.
Connection to 192.168.0.120 closed.