>> If I "register" this interface in the interfaces file, but place a dash
>> (-) and "ignore" in the options column would that work?
>>
>>     
>
> It would make your tcrules compile cleanly.
So "- tun0 ignore" it is then (btw the "ignore" option isn't documented 
anywhere in shorewall-interfaces).

One other issue I have been thinking lately - in some circumstances 
shorewall requires the interface to be "present" (or even up) - why is 
this and what happens if the interface suddenly "disappears" (like if I 
am to completely close the tun0 device)?

If I want to "cheat" (as I often do!) I could artificially "open" tun0, 
start shorewall and then close that device. What would happen then (if 
anything)?

>  But you must have extremely
> liberal policies if traffic in and out of such an interface is accepted
> by the filtering part of Netfilter.
>   
tun0 on one of my machines will only serve traffic internally coming 
from one of my subnets, so I am not overly worried about "intrusions".

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