High availability virtual ip

[Biran, Yahav (Yahav)]

i have two linux machines, that are running on the same LAN.
i would like to find a way to set HA IP.
i was thinking on creating virtual ip that will ride on the exiting eth.
lets say 10.0.0.1 and 10.0.0.2 and the VIP will be 172.16.4.1
both will run an infinite loop of:while (ping 172.16.4.1) do ...
once that the while is exiting in one of the hosts it will try to acquire
the VIP.
there is additional lock mechanism to implement so the two servers will not
try to acquire the same VIP concurrently.

i would like to know if there is any out of the box sofware that can do this
task?
yahav
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