from the 10.2.4 Server KB article: "Networking Mac OS X Server version 10.2.4 supports jumbo Ethernet frames (MTU up to 9 KB) on Xserve when used with supported PCI gigabit Ethernet cards. Support for IP over FireWire. This enhancement enables Mac OS X Server to utilize high speed, low latency interconnects for clustering and IP failover solutions over FireWire. You no longer need to use ports on your gigabit Ethernet switch in order to use IP failover. " Now I wonder how we activate it in the client version of OSX?