rudi when migrating some rackmount HP servers running Centos4 from hard coded 100 meg fdx to auto gigE that we had to 1) remove this from our ifcfg-ethX files ETHTOOL_OPTS="speed 100 duplex full autoneg off" 2) proper CAT6 wiring 3) plug into the copper gigE switchport 4) reboot using Cisco though... did not find a decent plug n play solution i.e., did not waste a lot of time looking for solutions other than the obvious cisco and centos config or network down and up interface commands - rh