Networking issue

[H.S.]

Jose Rodriguez wrote:
> Hello everyone!
> 
> Here is my problem, hope someone can help.
> 
> Im trying to setup a wireless network with my Pc as a wireless router.
> I have a Broadcom wireless card and im using Ubuntu 8.04.
> 
> For the configuration of the network i followed these instructions:
> https://help.ubuntu.com/community/Router
> 
> For the configuration of a DNS and DHCP i followed these:
> https://help.ubuntu.com/community/UbuntuWirelessRouter
> 
> I basically:
> - Configured /etc/network/interfaces with eth0, which has an IP assigned
> dinamically by the router/modem; and also configured wlan0 interface with an
> IP static.

It appears that you have a LAN cable connecting your eth0 to your
modem/router's LAN port. I would assign a static IP to eth0. This
simplified things and makes debugging for problems easier.


> - I tested connectivity, everything fine.
> - Then configured a DNS/DHCP server using dnsmasq.

Make sure that it is *not* listening on eth0 (the interface connected to
your modem/router) for DHCP requests because you must always have only
one DHCP server on a network. Your modem/router and eth0 is one network,
and rest of the interfaces on your computer (eth1, wlan0?) are other
different networks. BTW, it would be a good idea to specify what are all
these three networks in your case?

Also, is this picture correct?
                               -------------------
   ____________   lan cable    |             eth1|-> to a switch?
->|Router/Modem|>--------------|eth0        wlan0|-> wireless clients
   ------------                |_________________|

                                     ^
                                     |______Ubuntu computer

> - Finally NAT with a script as the link above can show you.
> 
> I dont think the DHCP was working so i deactivated.

Yes, good idea. Just to make sure everything is working, you can always
give other computers a static IP address.


> My problem is, i have internet in my pc/wireless router but when i try to
> connect my cellphone or another Pc or my Ipod to the wireless network i
> created i dont have access to internet. I assigned an static IP to every
> device but i cant navigate.

What about wireless encryption? Are you using any? For now, I would
suggest you disable all encryption.

Also, what is the output of the following command:
$> ifconfig -a


> 
> From the router i ping every interface and it works but when i try to reach
> other host supposedly connected with ping, i cant reached it. Same if i try
> from a Pc to the router. What am i missing here??? I thought it could be a
> bad assigment of IP address but for my eth0 im using 192.168.0.103/24, and
> for my wlan0 im using 192.168.1.1/24. The hosts then would have
> 192.168.1.2-254/24.

Correct, your eth0 is on 192.168.0.0 network and wlan0 is on 192.168.1.0
network. If you wlan0 is assigned 192.168.1.1, then your hosts can have
any of the 2-254 IP addresses.

I see that you have only one wired interface (no eth1).


> 
> Then only thing i could think of is that when i configured my wireless card
> they recommend to set it as a master mode, but i havent been able to make it

What exact card is this?


> support that. I set it in ad-hoc mode which it suppose to work as well.

I think you need it to work in master. What did you try to do so? Also,
what wireless manager are you using (one is hostapd)?



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