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Re: How to share the Internet with Linux and an iPad by Wi-Fi?

On Mon, 2012-02-20 at 11:59 +0200, Andrei POPESCU wrote:
> On Du, 19 feb 12, 12:58:19, Ralf Mardorf wrote:
> > 
> > I only enabled wireless, the DSL connection isn't set up by nm, it was
> > set up by pppoeconf and starts automatically at startup.
> You're probably better of doing it by hand, aproximate steps from 
> memory:
> - disable network manager
> - configure wlan0 with a static IP + netmask in /etc/network/interfaces 
>   (but no gateway, this is important)
> - install hostapd, dnsmasq and resolvconf if not already installed
> - configure hostapd: which interface (wlan0), wpa2, wpa2 passphrase
> - configure dnsmasq as DHCP server (uncomment one of the network 
>   definitions in /etc/dnsmasq.conf)
> - enable IP forwarding: I usually do this with shorewall since in such 
>   cases I need a firewall anyway
> - if MTU for you pppoe is set to 1492 you may need to clamp MSS to Path 
>   MTU Discovery[1] (with shorewall or the iptables command mentioned on 
>   that page
> [1] http://lartc.org/howto/lartc.cookbook.mtu-mss.html
> Kind regards,
> Andrei

Thank you Andrei,

I already tried this, but I'll try again, since your information allows
me to google more precise. I'm uncertain if I should test Wicd first.

Kind regards,

The iwconfig part seems to be ok, the iptables part isn't.

$ cat adhoc
#! /bin/sh
# sh ./adhoc
# https://help.ubuntu.com/community/WifiDocs/Adhoc

sudo service network-manager stop
sudo ip link set $device down
sudo iwconfig $device mode ad-hoc
sudo iwconfig $device channel 4
sudo iwconfig $device essid 'oz'
sudo iwconfig $device key 1324354657
# sudo dhclient $device
sudo ip addr add dev $device


# default policies
sudo iptables -t nat -P POSTROUTING ACCEPT
sudo iptables -t nat -P OUTPUT ACCEPT
sudo iptables -t nat -P PREROUTING ACCEPT
sudo iptables -t filter -P INPUT DROP
sudo iptables -t filter -P FORWARD DROP
sudo iptables -t filter -P OUTPUT DROP

# NAT on behalf of secondary LAN 
sudo iptables -t nat -A POSTROUTING -s -j SNAT
--to-source 192.168.1.xxx

# forward packets from/to secondary LAN
sudo iptables -t filter -A FORWARD -s -j
sudo iptables -t filter -A FORWARD -d -j

exit 0

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