It would be really really cool if I could make the ports different from
virtual-->real, something like this in lvs.cf :

virtual vs1 {
	active = 1
	address = 172.100.1.250 eth0:5
	port = 80
	...

	server real1 {
		address = 172.100.1.75
		port = 81
		...
	}
	server real2 {
		address = 172.100.1.75
		port = 82
	}

}

Thanks, 
-Ray