Request wireless connection sharing.

[Joeordie]

Gents,

Thanks for this great tool. I'm trying to see if I can help, but fear that this is above my expertise at the moment. I would request that we have a reverse AP available so it would specifically look like this.

WAN<--- (some wifi access point) <--- wlan0 (create_ap NAT's to eth0) ----> dhcp clients

so its simply sharing the wireless connection through a eth0.

I know there are other tools in the wild that can do this in the world but i would like to keep all simple using the create_ap commands/script. All the needed tools are available in this case but I don't think the command is built into the script.

Joeordie

[oblique]

With few changes I can implement this, but the purpose of this script is to create an AP. I will think about it because probably I need to change the command line arguments of create_ap and I need to take some good decisions for this. Anyway, even if I decide to add this feature, I'm a bit busy for now.

Few months ago I wrote a small script that do what you said, but is not that powerful as create_ap and it doesn't removes firewall restrictions etc. Check the code:

#!/bin/bash

INTERNET_IFACE=wlan0
WIRED_IFACE=eth0
SUBNET=192.168.12

cleanup() {
    trap "" SIGINT
    iptables -D FORWARD -d ${SUBNET}.0/24 -i $INTERNET_IFACE -j ACCEPT
    iptables -D FORWARD -s ${SUBNET}.0/24 -i $WIRED_IFACE -j ACCEPT
    iptables -t nat -D POSTROUTING -o $INTERNET_IFACE -j MASQUERADE
    echo 0 > /proc/sys/net/ipv4/ip_forward
    ip link set dev $WIRED_IFACE down
    ip add flush $WIRED_IFACE
    exit 0
}

# setup clean up function
trap "cleanup" SIGINT

# initialize ethernet
ip link set dev $WIRED_IFACE up
ip add flush $WIRED_IFACE
ip addr add ${SUBNET}.1/24 broadcast ${SUBNET}.255 dev $WIRED_IFACE

# set iptables rules
iptables -I FORWARD -d ${SUBNET}.0/24 -i $INTERNET_IFACE -j ACCEPT
iptables -I FORWARD -s ${SUBNET}.0/24 -i $WIRED_IFACE -j ACCEPT
iptables -t nat -I POSTROUTING -o $INTERNET_IFACE -j MASQUERADE

# enable ipv4 routing
echo 1 > /proc/sys/net/ipv4/ip_forward

# run dnsmasq
dnsmasq --no-hosts --listen-address=${SUBNET}.1 --dhcp-range=${SUBNET}.1,${SUBNET}.254,255.255.255.0,24h --dhcp-option=option:router,${SUBNET}.1 -d

cleanup

[Joeordie]

ill try this script, this one i can follow, I will look into create_ap and see if this can be accommodated. Still learning though.

[ghost]

I want a feature that share my Linux internet through another interface.

Internet(ipv4&ipv6)--------------[eth0/wlan0]--Linux--[eth1 with dhcpd(v4&v6)] --------------many clients in LAN

This is similar to Joeordie's . The interface to public Internet can be any type , wifi or wired.

And this create_ap is the best and most convenient tool I have ever seen on Internet. I hope it has this feature. Maybe it can be done by adding an option that just cut the creating wifi AP stuff.

[reigelgallarde]

@oblique, I understand that you don't have a plan on implementing this years ago. I'm using your above script though and it's working well.

I'm using a raspberry pi with create_ap. It was all good until I found out that the built in wifi is not capable for doing long range wifi. I bought a usb dongle to in hopes I can produce a wider ranged. But then there was a problem with powering the raspberry pi and this usb dongle.

What I came up with in the end was to use a router. The router has its own AP configured. Disabled DHCP, and is connected to raspberry pi. Now my setup is still the same idea with create_ap but now on eth1. Your script above works. But just wished I could still use create_ap instead.

More power to this script. Thank you for creating create_ap.