Distribute outgoing connections among multiple IPs configured on the same NIC

I have a NIC with 2 aliases on it. The network interface has 3 IPs configured on it. Think about it like this: i can ping the same server by hitting .100 .101 and .102.

I want the source address of the outgoing connections to be distributed among these ip. So if i have 3 opened connections, one connection will have result as having an IP address ending with .100, the other two should result as having as ip addresses .101 and .102.

I'm using FreeBSD but I think this question to be Linux-Like wide.