Re: (newbie) a network related question

#1 (**permalink**) 02-17-2008, 06:35 PM

On Tue, Mar 14, 2006 at 10:16:18AM -0500, Peter Landry wrote:
> >> Third, if you live in a house with a single address, you cannot
> >> publicly start announcing different addresses without the postal
> >> service knowing about it. If packets should arrive at your home, then
> >> you better make sure you write your street and number on the
> >> announcement, other things just won't work.
> >>
> >
> >No but I use the following format: address+office1 ... address+officeN!
> >That's what I try to achieve with the IPs as well but without having to
> use >port numbers!
>
> While this analogy is probably starting to get a little stretched,
> address + officeN is analogous to ip

ort. IP address is like a postal
> service address, it tells where a packet should physically go to. once
> it gets to that address, its up to the receiving computer to figure out
> which program is listening to the port the packet arrived on. When you
> send a letter to address + officeN, the post office doesn't care about
> the officeN part, it just looks at the address to get the packet there.
>
> >> Last but not least: _if_ your ADSL provider will assign and route
> >> multiple addresses to your router (for example a complete C network),
> >> then you can - of course - translate the different numbers into
> >> different numbers in your internal network. But then: why you are not
> >> using these IPs for your internal network directly?
> >>
> >
> >well, that's not case. But even then, how can a ISP assign a complete C
> >network just like this? What's behind that?
>
> the ISP is assigning IPs based on a block of IPs they already own, they
> don't just "create" them. They'll block off part of their own class A or
> B network and allow you to use them. All IPs get assigned by a naming
> authority, such as ARIN.

OK.

I would also like to thank all the participants for their replies.

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