Adding Wireless to Cable Connection

[shimi]

On Sun, Oct 11, 2009 at 8:43 AM, Aharon Schkolnik <aschkolnik at gmail.com>wrote:

> On Thursday 08 October 2009, shimi wrote:
> > The right way to do it is not with an Access Point. Someone needs to
> > "multiplex" your connection to multiple devices. Since you have just
> > one external IP address, someone needs to "share" it between your
> > multiple machines and do "magic" that makes it (multiple unicast
> > machines between one unicast address) work. We call that magic-maker a
> > "NAT router" (which basically every home router does).
>
> Yeah, I realize that I need NAT (or PAT in Cisco terms), but I thought (I
> admit I didn't check) that the AP might do the NAT.
>
>
A pure AP is a "wireless switch" - it talks Layer 2 only.


> > So what you
> > need is an Ethernet router (with an Ethernet port on his WAN port).
>
> Thing is, I was wondering why I need a router. I don't need it to do any
> routing decisions (unless I want to share files between connected PCs,
> which I don't). I do need NAT, but I kind of thought an AP would do that.
>
>
NAT is performed at Layer 3 (some would even say Layer 4?). A layer 2 device
does not understand (nor cares about) these layers at all. It can just
forward frames...

 -- Shimi
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