[Cialug] Routes? Interfaces?

[Jeff Chapin]

I would picture the interfaces as the doors to the building, and the
routes as the path needed to get somewhere. If you leave by the front
door, you take a different route than if you leave by the front. If you
picture a building with access to the skywalks, the outside, and the
garage, you can get a good idea of how it works.

Now on a computer, each interface can be on the same network, and have
the same routes, or they can be on completely different networks, with
different addresses blocks, and rules.

It is possible that the two interfaces open to the same network (think
double doors), and thus you would use the same route. It is also
possible that they are different networks (think sidewalk versus
skywalk) and require a little different routing.

Jeff


Todd Walton wrote:
> On Fri, Feb 27, 2009 at 9:59 AM, Dave J. Hala Jr. <dave at 58ghz.net> wrote:
>   
>> You are the packet of data.  You just had lunch and your default route
>> back to work can be via anyone of a number of interfaces. The skywalk
>> interface, the sidewalk interface, the porsche boxer interface.
>>
>> Each time you reach an intersection there is a default direction (route)
>> to take. You just travel along taking the default routes until you
>> happen across the front door of your office building, at which point the
>> bellman grabs you and throws you on the elevator that wisks you up to
>> your office.
>>     
>
> If I take the sidewalk there's a different route than if I take the
> skywalk.  Is that correct in Linux-land?  Is going through eth0 going
> to use a different route than going through eth1?
>
> I like the analogy, btw.
>
> -todd
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