NAS-Port

[Anton Blajev]

Hello there, 
It's me again :)

I'm writing with an idea, 
As we saw NAS-Port is not obligatory, it's used to say about the port
client's using to connect, okay...
but why ins't ppp sending 
NAS-Port = tun0 for example (with the other type value:
something like this:
NAS-Port-Type = "Virtual"
NAS-Port = "tun0"
)

Wouldn't this be good to be done , because freeradius (and myabe other
radiuses) are using NAS-Port for unique identifyer to give an ip
addres... so there are no duplicates...

So, I'm asking... wouldn't be more proper and accurate ppp to send
NAS-Port = tun or it's being done on purpose not to do this.