Useful

IPMI v2.0 - accessing SOL from Linux command line.

http://wiki.nikhef.nl/grid/Serial_Consoles

(use a bit rate that makes sense for you, only set if necessary)

ipmitool -I lanplus -H host.ipmi.nikhef.nl -U root sol set volatile-bit-rate 9.6
ipmitool -I lanplus -H host.ipmi.nikhef.nl -U root sol set non-volatile-bit-rate 9.6

ipmitool -I lanplus -H IPMI-BMC-IPADDR -U BMCPRIVUSER sol activate