The key ingredient: the wificard must support Master mode.
Apparently, there is no way to query if the card supports a particular
mode. One just tries setting it and then checks if the mode changed.
For example, in my case my wifi card is eth1:
$ sudo iwconfig eth1 | grep -o 'Mode:[^ ]*'
Mode:Managed
$ sudo iwconfig eth1 mode Master
Error for wireless request "Set Mode" (8B06) :
SET failed on device eth1 ; Invalid argument.
$ sudo iwconfig eth1 | grep -o 'Mode:[^ ]*'
Mode:Managed
I guess not.
Regards,
- Robert
On Sun, Sep 11, 2011 at 3:20 PM, Robert Citek <[email protected]> wrote:
> Hello all,
>
> In the days before ubiquitous wifi cards, I was able to "tether" a
> friend's laptop without a wifi card to my laptop via a crossover
> ethernet cable. My laptop had DHCPd running on the wired interface
> and was NAT'ed to route via the wifi interface. This allowed my
> friend to access the Internet via my laptop. The setup was something
> like this:
>
> [friend] --- [me] -))) (((- Internet
>
> where "---" represents the Ethernet cable and "-))) (((-" represents
> the wifi connection.
>
> In fact, I was able to do this for a few friends at the same time if I
> brough along a switch/hub and had access to external power.
>
> I would now like to do something similar, but somewhat in reverse:
>
> [friend] -))) (((- [me] --- Internet
>
> Specifically, my friend's laptop would connect to mine via wifi, and
> my laptop would NAT/route traffic via the wired interface out to the
> Internet.
>
> I would imagine that I would somehow need to do the following:
> 1) create an ESSID
> 2) enable it to be broadcast
> 3) enable DHCPd on the wifi interface
> 4) enble NAT routing between the wifi and the wired interface.
>
> I'm getting stuck at the first two steps. This would seem as though I
> am turning my laptop into a "hotspot". However, using that search
> term hasn't brought me any joy. Every hit I've found refers to using
> a wifi router (e.g. the WRT54G) and then all kinds of fancy
> authentication schemes.
>
> Am still Googling and browsing, but any pointers to the more correct
> search terms would be helpful.
>
> Thanks in advance.
>
> Regards,
> - Robert
>
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