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Internet Connection Sharing

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  Internet Connection Sharing "J.B. Wood" <arl_123234@hotmail.com> - 2018-02-16 08:56 -0500
    Re: Internet Connection Sharing "Jonathan N. Little" <lws4art@gmail.com> - 2018-02-16 09:17 -0500
    Re: Internet Connection Sharing Aleksandar Kuktin <ak@triklod.rs> - 2018-02-16 14:21 +0000

#4106 — Internet Connection Sharing

Hello, all.  I have a question directed to anyone who has actually done 
the following:

1.  A Fedora or CentOS (I use both) platform is connected to the 
internet via Cat5 cable, IOW not using wifi.  However, this Linux 
platform does have wifi capability.

2.  It is desired to setup up the Linux platform as a wifi hotspot 
(wirelss NAT) such that a wifi enabled Windows 7 platform can share the 
Linux platform's connection to the internet.  DHCP provided by the Linux 
box would be convenient but assigning a static IP address, netmask, and 
default gateway to the Win7 platform is just as easy.

3.  The above is easily accomplished when all the platforms are Windows. 
  I also can readily share a Win7 internet-connected platform witn a 
Linux box via wi-fi but that's the reverse of what I want to accomplish. 
  Your time and comment is greatly appreciated.  Sincerely,

-- 
J. B. Wood	            e-mail: arl_123234@hotmail.com

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#4107

J.B. Wood wrote:
> Hello, all.  I have a question directed to anyone who has actually done 
> the following:
> 
> 1.  A Fedora or CentOS (I use both) platform is connected to the 
> internet via Cat5 cable, IOW not using wifi.  However, this Linux 
> platform does have wifi capability.
> 
> 2.  It is desired to setup up the Linux platform as a wifi hotspot 
> (wirelss NAT) such that a wifi enabled Windows 7 platform can share the 
> Linux platform's connection to the internet.  DHCP provided by the Linux 
> box would be convenient but assigning a static IP address, netmask, and 
> default gateway to the Win7 platform is just as easy.
> 
> 3.  The above is easily accomplished when all the platforms are Windows. 
>   I also can readily share a Win7 internet-connected platform witn a 
> Linux box via wi-fi but that's the reverse of what I want to accomplish. 
>   Your time and comment is greatly appreciated.  Sincerely,
> 


If Linux box has a WiFi adapter and a Ethernet adapter it can be easily 
done in Ubuntu within the Network Settings dialog. That is be an Ad-hoc 
Wifi connection. If you want an Infrastructure connection (preferred as 
your #2) the wifi card must support AP/Master mode and it can easily 
done with hostapd.

<https://gist.github.com/werty1st/6350728>

-- 
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com

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#4108

On Fri, 16 Feb 2018 08:56:16 -0500, J.B. Wood wrote:

> Hello, all.  I have a question directed to anyone who has actually done
> the following:
> 
> 1.  A Fedora or CentOS (I use both) platform is connected to the
> internet via Cat5 cable, IOW not using wifi.  However, this Linux
> platform does have wifi capability.
> 
> 2.  It is desired to setup up the Linux platform as a wifi hotspot
> (wirelss NAT) such that a wifi enabled Windows 7 platform can share the
> Linux platform's connection to the internet.  DHCP provided by the Linux
> box would be convenient but assigning a static IP address, netmask, and
> default gateway to the Win7 platform is just as easy.
> 
> 3.  The above is easily accomplished when all the platforms are Windows.
>   I also can readily share a Win7 internet-connected platform witn a
> Linux box via wi-fi but that's the reverse of what I want to accomplish.
>   Your time and comment is greatly appreciated.  Sincerely,

Did you figure out how to set Linux as the Access Point? I did it long 
ago, and don't remember all the details anymore.

As for the network configuration in Linux, assume eth0 is your outside 
interface. Assume 123.123.123.123/24 is the IP address/mask on there. 
Assume wlan0 is the inside interface. Assume 10.0.0.1/8 is the address/
mask on the inside.

The Windows box (or any internal machine for that matter) should have an 
address in the subnet 10.0.0.0/8 - to be able to find 10.0.0.1 
independently. It's default IP route should point towards 10.0.0.1 .

First, set up the NAT for the linux box:
iptables -I POSTROUTING -o eth0 -s 10.0.0.0/8 -j MASQUERADE

Then enable routing:
echo 1 > /proc/sys/net/ipv4/ip_forward

It should work with this setup.

To make it permanent, use iptables-save to save you current firewall 
configuration to a file and iptables-restore to load it back up. Use /etc/
sysctl.conf to save IP forwarding (line should look like 
'net.ipv4.ip_forward = 1').

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