[Swan-dev] what is INTERFACE_IP / ifaceip / interface-ip= for?

[Andrew Cagney]

I suspect it has something to do with XFRMI.  As best I can, in the
current code, it is simply being passed to up-down scripts as
INTERFACE_IP=...?
While the name ifaceip leads me to think it's got something to do with
the host interfaces, I suspect it is connected to the XFRMI client
interface IP (if this is true I'll rename the field to
client_interface_ip)?