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From: Paulo da Silva on 20 Jul 2010 17:34
Hi!

I have a wifi wpa2 network with 3 PCs - PC1, PC2 e PC3 configured and
working with local fix IPs (192.168.1.10,11,12), router gw 192.168.1.1.

Now I want to add a 4th PC, PC4, to PC3 using a eth cable (no wifi).

PC1 wlan0 <--------....-------+
|
PC2 wlan0 <--------....-------+---> router
|
PC3 wlan0 <--------....-------+
eth0 <---------+
|
PC4 eth0 <---------+

I was not able to bridge wlan0 and eth0! Don't know why. I used the same
commands to bridge 2 eth0 and it worked but failled when one port was wlan0.

So I am thinking to use two subnets (netmask 255.255.254.0).

Pls. correct me if I am wrong ...
Let's do PC3 eth0 192.168.2.12 and PC4 eth0 192.168.2.13 for ex.
On PC4:
ifconfig eth0 192.168.2.13 up
route add default gw 192.168.2.12

What commands should I issue on PC3?
ifconfig eth0 192.168.2.12 up
????

Thank you very much for any help/comments.
Paulo
From: Pascal Hambourg on 21 Jul 2010 03:33
Hello,

Paulo da Silva a écrit :
>
> I have a wifi wpa2 network with 3 PCs - PC1, PC2 e PC3 configured and
> working with local fix IPs (192.168.1.10,11,12), router gw 192.168.1.1.
>
> Now I want to add a 4th PC, PC4, to PC3 using a eth cable (no wifi).
>
> PC1 wlan0 <--------....-------+
> |
> PC2 wlan0 <--------....-------+---> router
> |
> PC3 wlan0 <--------....-------+
> eth0 <---------+
> |
> PC4 eth0 <---------+
>
> I was not able to bridge wlan0 and eth0! Don't know why. I used the same
> commands to bridge 2 eth0 and it worked but failled when one port was wlan0.

Maybe your wireless adapter does not allow spoofing of the source MAC
address.
<http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge#It_doesn.27t_work_with_my_Wireless_card.21>

> So I am thinking to use two subnets (netmask 255.255.254.0).

Why this netmask ?

> Pls. correct me if I am wrong ...
> Let's do PC3 eth0 192.168.2.12 and PC4 eth0 192.168.2.13 for ex.
> On PC4:
> ifconfig eth0 192.168.2.13 up

Note that if you don't specify a netmask ifconfig uses the classful mask
by default (192 is class C so 255.255.255.0).

> route add default gw 192.168.2.12
>
> What commands should I issue on PC3?
> ifconfig eth0 192.168.2.12 up

Yes. You should add a route to subnet 192.168.2.0/24 via 192.168.1.12 on
the router too, so routing works in both directions.
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