Raspberry Pi as a Hotspot: Difference between revisions

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     range 10.11.12.101 10.11.12.120;
     range 10.11.12.101 10.11.12.120;
     option broadcast-address 10.11.12.255;
     option broadcast-address 10.11.12.255;
    option routers 10.11.12.13;
    option domain-name-servers 8.8.8.8, 8.8.4.4;
}
}
</pre>
</pre>
Line 96: Line 99:


= NAT =
= NAT =
In my config I have not configured port forwarding and NAT.  For my application here I am using the Raspberry Pi with SMB shares so the kids can access TV shows and movies from their android tables in the car so NAT is not required. This also why I have not configure a gateway or name servers in the DHCP server. I may add the NAT details at a later time.
In my config I have not configured port forwarding and NAT.  For my application here I am using the Raspberry Pi with SMB shares so the kids can access TV shows and movies from their Android devices in the car so NAT is not required.
 
== forwarding ==
<pre>
vi /etc/sysctl.conf
</pre>
 
change
<pre>
#net.ipv4.ip_forward=1
</pre>
 
to be
 
<pre>
net.ipv4.ip_forward=1
</pre>
 
== iptables ==
<pre>
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
</pre>
 
Refer to [[Iptables#Automatic_Load_on_Restart | iptables]] for automatic load on boot.
 
= reboot =
Lastly reboot and all hopefully will be good.


[[Category : Raspberry Pi]] [[Category : Linux]]
[[Category : Raspberry Pi]] [[Category : Linux]]

Latest revision as of 11:28, 6 January 2015

configure wlan

Assign an IP address to NIC

vi /etc/network/interfaces

add

auto wlan0

Remark the following lines so the wlan never acts as a client

#allow-hotplug wlan0
#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
#iface default inet manual

Assin an IP address to wlan0

iface wlan0 inet static
address 10.11.12.1
netmask 255.255.255.0
wireless-mode Master

dhcp

Setup DHCP Scope. More information can be found at DHCP_for_Linux

apt-get install isc-dhcp-server
vi /etc/dhcp/dhcpd.conf

The following is based on your requirements.

# option definitions common to all supported networks...
#option domain-name "example.org";
#option domain-name-servers ns1.example.org, ns2.example.org;
subnet 10.11.12.0 netmask 255.255.255.0 {
    range 10.11.12.101 10.11.12.120;
    option broadcast-address 10.11.12.255;

    option routers 10.11.12.13;
    option domain-name-servers 8.8.8.8, 8.8.4.4;
}


vi /etc/dhcp/dhcpd.conf 

Bind DHCP to wlan interface

vi /etc/default/isc-dhcp-server

Change

INTERFACES=""

to

INTERFACES="wlan0"

hostapd

As I have the RTL8188CUS wireless chipset I needed to download a specific version of the hostapd application. Other wireless network cards you could try using the distro package

apt-get install hostapd 

otherwise

cd /usr/src
wget https://github.com/jenssegers/RTL8188-hostapd/archive/master.zip
unzip master.zip
cd RTL8188-hostapd-master/hostapd/
make
make install
vi /etc/hostapd/hostapd.conf

Configure the following paramaters as required

ssid=
channel=
wpa_passphrase=

NAT

In my config I have not configured port forwarding and NAT. For my application here I am using the Raspberry Pi with SMB shares so the kids can access TV shows and movies from their Android devices in the car so NAT is not required.

forwarding

vi /etc/sysctl.conf

change

#net.ipv4.ip_forward=1

to be

net.ipv4.ip_forward=1

iptables

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

Refer to iptables for automatic load on boot.

reboot

Lastly reboot and all hopefully will be good.