internet wifi sharing
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  1. #1
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    internet wifi sharing

    How can I share the internet on a F-19 laptop to other linux machines over wifi, preferably with authentication.
    I am looking something like connectify (http://www.connectify.me/), which facilitates connecting & sharing the same wifi.

  2. #2
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    Re: internet wifi sharing

    Howdy,

    I don't have a rebroadcast solution, but I usually hook the laptop to the upstream Wifi and then hook other machines to the laptop ethernet port:

    #! /bin/bash
    echo Configure a laptop as a wlan0 to eth0 NAT router:
    echo WAN = wlan0, DHCP
    echo LAN = em1, 192.168.0.1, 255.255.255.0

    ifconfig em1 down

    # Accept all traffic
    iptables -F
    iptables -P INPUT ACCEPT
    iptables -P OUTPUT ACCEPT
    iptables -P FORWARD ACCEPT

    # General new connection rate limiting for DOS and Brute Force protection
    iptables -I INPUT -p TCP -m state --state NEW -m limit --limit 30/minute --limit-burst 5 -j ACCEPT

    # Configure a port for the LAN hooked to eth0
    ifconfig em1 192.168.0.1 netmask 255.255.255.0 up

    # Enable IP forwarding
    echo 1 > /proc/sys/net/ipv4/ip_forward

    # Create a NAT firewall
    # WAN = wlan0, LAN = em1
    iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
    iptables -A FORWARD -i wlan0 -o em1 -m state --state RELATED,ESTABLISHED -j ACCEPT
    iptables -A FORWARD -i em1 -o wlan0 -j ACCEPT

    echo
    echo On the LAN machine do:
    echo ifconfig eth0 192.168.0.2 netmask 255.255.255.0 up
    echo route add default gw 192.168.0.1
    echo
    echo Edit /etc/resolv.conf and add the Google public DNS:
    echo nameserver 8.8.8.8
    echo nameserver 8.8.4.4
    echo
    echo Now the LAN machine should be able to connect to the wild wild world via the laptop.
    echo
    echo La voila!

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