What Do These Devices Do?

[beno]

Max Laier wrote:
>> vr0
>> plip0
>> lo0
>>     
>
> You seem a little lost.  I suggest that you read a book to cover some 
> basics before diving in with a tutorial you obviously do not understand.  
>   
Well, I appreciate your advice. But I *do* understand *most* of it. I'm 
just asking about what I *don't* understand. You guys that have the 
glorious advantage of having learned from professionals either as a 
student or as a co-worker have no concept of how difficult this is to 
learn by one's self. Indeed, I've spent all_day_yesterday_and_today 
studying this material. And I've read and re-read quite literally dozens 
of thick books on programming over the years.
> What tutorial? URL? 
>   
http://www.openbsd.org/faq/pf/index.html
> IPFilters? This list is about "packet filter (pf)" 
>   
I still get confused as to the difference, sorry. I mean PF.
beno