Recommend vpn-remote-access port?

Hi all, I have a few machines at other places, each behind a nat/fw device. I'd like to deploy a simple vpn to allow me to easily remote access each remote machine. In my mind it would be something like this:
IPsec tunnel between the machines
Each machine has a loopback address
Each machine has the require static route to know which tunnel to use for the remote loopback address

These machines are not routers, I just need vpn to make remote access easy. Rather than me trying a bunch, can anyone recommend a port or two?

Thanks again,
PacketMan
 
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