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Posted by vineethkartha

GEEK PEEK

My works and thoughts

Sharing Internet over Wifi Between Ubuntu

and Android

SEP 19

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I searched the internet alot for a solution to connect my PCs internet to my android phone by creating ahotspot. In windows you have softwares like connectify to make your life easy, But in linux things are not

so easy, and I was nevera windows guy. I hated to logon to windows just to share the internet over wifi to

my android phone. I spend many sleepless nights trying to configure hostapd in Ubuntu and make it

connect to my Android. And finally after days of searching and experimenting that wonderful day of bliss

occurred to me. I have combined information I received from various sites in this post.

Initially when I shared my problem in certain groups I got the advice to set up an ad-hoc wifi network in

ubuntu, but Android 2.3 and lower versions do not detect ad-hoc network so that means you either have to

root your phone and ad the necessary features or you have to go for an alternative way.

I was definite that there will be an alternative because in windows there are softwares like connectify that

do the job, and in linux we have hostapd.

So let me get directly to the point.

Open a terminal and type

#lspci

It will show the network adapter available to you.
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#lsmod

Shows that it uses the ath9k drivers (this information may help you to google for setup information specific

to your machine.)

Also

#iwconfig

will give you the name of your wireless adapter like wlan0. Please notedown this name as you will be

needing it later on.

Now its time to install the packages.

Either fire up the ubuntu software center and install hostapd and dhcp3-server, or fire up the terminal and

type

#sudo apt-get install dhcp3-server#sudo apt-get install hostapd

After this is done we have some serious editing to do so create a backup of all the files that are being

edited.

In a terminal:

#sudo gedit /etc/hostapd/hostapd.conf

When the file is opened make the contents of the file as below.

interface=wlan0driver=nl80211ssid=geekpeekchannel=1hw_mode=gauth_algs=1wpa=3wpa_passphrase=12345678wpa_key_mgmt=WPA-PSK

wpa_pairwise=TKIP CCMPrsn_pairwise=CCMP


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In this file we have declared that our wifi hotspot will be called geekpeek, it is using the adapter wlan0, and

it should have a password which the connecting device has to enter. Save the file.

Next

#sudo gedit /etc/default/isc-dhcp-server

Edit the line that says

INTERFACES="

To

INTERFACES=wlan0

Then edit

#sudo gedit /etc/dhcp/dhcpd.conf

Make sure the follow lines are Commented out ( put a hash # sign at the beginning of the line ) the

following lines:

# option definitions common to all supported networks...#option domain-name example.org;#option domain-name-servers ns1.example.org, ns2.example.org;#default-lease-time 600;#max-lease-time 7200;

Add the following lines to the file (copy and paste)

subnet 10.10.0.0 netmask 255.255.255.0 {range 10.10.0.2 10.10.0.16;option domain-name-servers 8.8.4.4, 8.8.8.8;option routers 10.10.0.1;}

Here we have specified the IP of our PC as 10.10.10.1 and 15 other PCs with addresses ranging from10.10.0.2 to 10.10.0.16 can be connected to your PC.

Next edit


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#sudo gedit /etc/network/interfaces

This is how my interfaces file looks:

To whatever is existing in the file add,

auto wlan0iface wlan0 inet staticaddress 10.10.0.1netmask 255.255.255.0

At this stage you can reboot. And hopefully any device / laptop should connect to your wifi hotspots

network via the network manager applet. On these devices search for the network geekpeek and type in

the password.

To Connect to the internet we have some more procedures to follow.

In a terminal type:

#ifconfig

It will display the adapter name being used for connecting to the internet. I was using the LAN so my

adapter name was eth0, if you are using modems then it might be ppp0

First we have to allow ip forwarding:

#sudo gedit /etc/sysctl.conf

Make sure the following line is uncommented and reads

net.ipv4.ip_forward=1

Save and close gedit. (reboot)

After reboot: Connect to the Internet and In a terminal type:

#sudo gedit /etc/rc.local

add this line just before exit 0


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iptables -t nat -A POSTROUTING -s 10.10.0.0/16 -o ppp0 -j MASQUERADE

Then reboot the system.

The eth0 should be changed to whatever adapter you are using.

Once this is done you can make other laptops connect to to youe new wifi hotpsot by assingning them IP

addreses in the range of 10.10.0.2 to 10.10.0.16

To make and Android detect your wifi hotspot.

Goto the wifi settings

(https://reader008.{domain}/reader008/html5/0418/5ad6b5ba4a4eb/5ad6b5bd93

(https://reader008.{domain}/reader008/html5/0418/5ad6b5ba4a4eb/5ad6b5bdeee3d.png)

press the options key ( the left most key)

Select Advanced>Use Static IP

(https://reader008.{domain}/reader008/html5/0418/5ad6b5ba4a4eb/5ad6b5be51

Give the IP address as something between 10.10.0.2 to 10.10.0.16

Gateway the same IP as your PC, In this case it is 10.10.0.1

Netmask as 255.255.255.0

DNS1 as 8.8.4.4

DNS2 as 8.8.8.8
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(https://reader008.{domain}/reader008/html5/0418/5ad6b5ba4a4eb/5ad6b5c048

Once this much has been set your android phone should be able to

connect to your wifi hotspot and you can access the internet connection

on your PC through your phone.

Now when you turn on your PC go to terminal and type

#sudo hostapd /etc/hostapd/hostapd.conf

Now I have made an application in Qt4 that provides a GUI to turn on

and off the wifi Hotspot, You can get it from the download

(http://vineethkartha.wordpress.com/downloads/) section

References

http://thenewbieblog.wordpress.com/2012/05/01/wifi-hotspot-setup-on-ubuntu/

(http://thenewbieblog.wordpress.com/2012/05/01/wifi-hotspot-setup-on-ubuntu/)

http://nims11.wordpress.com/2012/04/27/hostapd-the-linux-way-to-create-virtual-wifi-access-point/

(http://nims11.wordpress.com/2012/04/27/hostapd-the-linux-way-to-create-virtual-wifi-access-point/)

About vineethkartha

I am an Electrical and Electronics Engineer at Siemens India Ltd. Graduated from Govt Engg. College,

Barton Hill. A free software promoter and electronics hobbyist. I love C programming and have authored

a book "Thats How We C". Besides these my hobbies are cooking , Glass Painting and reading

View all posts by vineethkartha Posted on September 19, 2012, in Technical and tagged android, GUI, hostapd, hotspot, ubuntu, wifi.

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Comments (18)

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Jerrin Shaji George | September 21, 2012 at 12:05 pm

Great post

In the dhcpd.conf file, you missed an 8 in the google DNS.

vineethkartha | September 28, 2012 at 7:21 am

Thank you Jerrin for finding out the mistake

Jose manuel|November 25, 2012 at 1:10 pm

hello

I have this error when typing in the terminal sudo hostapd / etc / hostapd / hostapd.conf

Configuration file: / etc / hostapd / hostapd.conf

nl80211: Failed to set interface wlan0 into AP mode

nl80211 driver initialization failed.

ELOOP: remaining socket: sock = 4 eloop_data = 0x9e41900 user_data = 0x9e41ea0 handler =

0x807c5e0

ELOOP: remaining socket: sock = 6 eloop_data = 0x9e43ca8 user_data = (nil) handler = 08086770

I followed the tutorial and I can connect from my android to my laptop with these 2 ip addresses off

10.10.0.1 (wlan0) and 192.168.0.100 (eth0) but can not get the internet to work on my android and not

on my laptop

Thanks for any help you can give me

vineethkartha |November 29, 2012 at 11:06 pm

Dear friend, if my knowledge is correct, not all drivers support the Access Point (AP) Mode. so this

might be one reason for the error

Surajit| December 29, 2012 at 4:21 am

Hi,

I followed your tutorial, and everything has gone fine unless the last step.

When I hit enter after writing

sudo hostapd /etc/hostapd/hostapd.conf

it gives me the error

Configuration file: /etc/hostapd/hostapd.conf

nl80211: nl80211 generic netlink not found

nl80211 driver initialization failed.

And after that I checked my network manager applet and noticed that the wireless device is now

showing not managed.

my iwconfig returns

lo no wireless extensions.
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eth1 IEEE 802.11bg ESSID:"

Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated

Bit Rate:54 Mb/s Tx-Power:24 dBm

Retry min limit:7 RTS thr:off Fragment thr:off

Power Management:off

Link Quality=5/5 Signal level=0 dBm Noise level=0 dBm

Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0

Tx excessive retries:0 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

and I changed wlan0 to eth1.

I am using Ubuntu 12.04. Can you tell me what I have missed and what to check and what should I

check on those first two commands.

vineethkartha | December 30, 2012 at 10:53 am

Dear FriendSorry for the delay

This is how you can solve this issue

Go to the termional and type

sudo gedit /etc/NetworkManager/NetworkManager.conf

Then change the line managed=false to managed=true

sudo service network-manager restart

http://askubuntu.com/questions/71159/network-manager-says-device-not-managed This link mightgive you better help

Gelo | January 15, 2013 at 7:13 am

Thank you. Very good job.

After following the described steps I cant yet connect with my Samsung Galaxy S to Internet using my

laptops WIFI.

Ive made only one change on the instructions:

put eth0 instead ppp0 in the line

iptables -t nat -A POSTROUTING -s 10.10.0.0/16 -o ppp0 -j MASQUERADE

$iwconfig

wlan0 IEEE 802.11bgn ESSID:off/any

Mode:Ad-Hoc Frequency:2.412 GHz Cell: Not-Associated

Tx-Power=16 dBmRetry long limit:7 RTS thr:off Fragment thr:off

Power Management:off

lo no wireless extensions.
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eth0 no wireless extensions.

$lsmod

Module Size Used by

xt_state 12514 0

ipt_REJECT 12485 0

xt_tcpudp 12531 0

iptable_filter 12706 0

nf_nat_h323 12809 0

nf_conntrack_h323 51810 1 nf_nat_h323

nf_nat_pptp 12536 0

nf_conntrack_pptp 13553 1 nf_nat_pptp

nf_conntrack_proto_gre 13580 1 nf_conntrack_pptp

nf_nat_proto_gre 12671 1 nf_nat_pptp

nf_nat_tftp 12420 0

nf_conntrack_tftp 12817 1 nf_nat_tftp

nf_nat_sip 16945 0

nf_conntrack_sip 24467 1 nf_nat_sip

nf_nat_irc 12542 0

nf_conntrack_irc 13112 1 nf_nat_irc

nf_nat_ftp 12548 0

nf_conntrack_ftp 13106 1 nf_nat_ftp

ipt_MASQUERADE 12663 1

iptable_nat 12977 1

nf_nat 20316 9nf_nat_h323,nf_nat_pptp,nf_nat_proto_gre,nf_nat_tftp,nf_nat_sip,nf_nat_irc,nf_nat_ftp,ipt_MASQUE

RADE,iptable_nat

nf_conntrack_ipv4 14080 3 iptable_nat,nf_nat

nf_conntrack 66307 18

xt_state,nf_nat_h323,nf_conntrack_h323,nf_nat_pptp,nf_conntrack_pptp,nf_conntrack_proto_gre,nf_n

at_tftp,nf_conntrack_tftp,nf_nat_sip,nf_conntrack_sip,nf_nat_irc,nf_conntrack_irc,nf_nat_ftp,nf_connt

rack_ftp,ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4

nf_defrag_ipv4 12649 1 nf_conntrack_ipv4

ip_tables 17791 2 iptable_filter,iptable_natx_tables 21898 7

xt_state,ipt_REJECT,xt_tcpudp,iptable_filter,ipt_MASQUERADE,iptable_nat,ip_tables

bnep 17707 2

rfcomm 37276 0

bluetooth 183228 10 bnep,rfcomm

parport_pc 31968 0

ppdev 12817 0

snd_hda_codec_hdmi 31423 1

snd_hda_codec_realtek 63493 1

sp5100_tco 13417 0

arc4 12473 2

joydev 17161 0

kvm_amd 54394 0


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kvm 357806 1 kvm_amd

hid_generic 12445 0

acer_wmi 27586 0

sparse_keymap 13658 1 acer_wmi

mxl5005s 45855 1

snd_seq_midi 13132 0

snd_rawmidi 25382 1 snd_seq_midi

microcode 18209 0zl10353 17563 1

ath9k 116557 0

dvb_usb_ce6230 13133 0

snd_hda_intel 32515 5

dvb_usb 23606 1 dvb_usb_ce6230

dvb_core 98654 1 dvb_usb

snd_hda_codec 111547 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel

snd_hwdep 13272 1 snd_hda_codec

rc_core 21266 1 dvb_usbuvcvideo 71277 0

snd_seq_midi_event 14475 1 snd_seq_midi

snd_seq 51255 2 snd_seq_midi,snd_seq_midi_event

videobuf2_core 32070 1 uvcvideo

mac80211 461161 1 ath9k

videodev 95841 2 uvcvideo,videobuf2_core

videobuf2_vmalloc 12756 1 uvcvideo

ath9k_common 13783 1 ath9k

snd_pcm 80163 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec

psmouse 84843 0

videobuf2_memops 13184 1 videobuf2_vmalloc

usbhid 41702 0

serio_raw 13031 0

snd_seq_device 14137 3 snd_seq_midi,snd_rawmidi,snd_seq

ath9k_hw 376155 2 ath9k,ath9k_common

ath 19187 3 ath9k,ath9k_common,ath9k_hw

cfg80211 175375 3 ath9k,mac80211,ath

hid 82142 2 hid_generic,usbhid

snd_timer 24411 2 snd_seq,snd_pcmi2c_piix4 12983 0

k10temp 12958 0

shpchp 32189 0

snd 61991 20

snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_rawmidi,snd_hda_intel,snd_hda_codec,snd_hwdep,

snd_seq,snd_pcm,snd_seq_device,snd_timer

radeon 820734 4

ttm 75534 1 radeon

drm_kms_helper 47303 1 radeondrm 238768 6 radeon,ttm,drm_kms_helper

soundcore 14599 1 snd

i2c_algo_bit 13197 1 radeon

snd_page_alloc 14036 2 snd_hda_intel,snd_pcm


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wmi 18590 1 acer_wmi

mac_hid 13037 0

video 18847 1 acer_wmi

lp 13299 0

parport 40753 3 parport_pc,ppdev,lp

ums_realtek 17669 0

uas 17556 0

pata_atiixp 12999 0atl1e 32271 0

usb_storage 39350 4 ums_realtek

I would appreciate some help.

Thanks.

vineethkartha | January 15, 2013 at 4:19 pm

Please do give me some time to look into the issue as I am caught up with other work, I will lookinto it as soon as I can.

effepi| April 4, 2013 at 3:09 pm

My Pc with Ubuntu share my home internet connection with Android, but not if the connection is

through a company lan with firewall at predefined gateway. Can you give me help? Thanks.

vineethkartha | April 8, 2013 at 6:12 am

It must have something to do with the firewall settings. If your company policies are Liberal

enough ask your system admin


I can surf the Internet on the PC through firewall using my credentials, but on the smartphone I

dont see the form to login.

abhishek khandal| April 8, 2013 at 1:56 pm

You can get the login form on your smartphone at the address 192.168.1.1 or 192.168.0.1 maybe.


The smartphone ping the IP of PCs wlan interface, but not the ethernet (lan with static IP).

Thanks

abhishek khandal| April 7, 2013 at 8:50 pm

Hi vineeth

I followed all your mentioned steps,my HTC explorer connects to the network made,but the Internet

does not work,I cant browse internet or anything which requires internet.

I did everything mentioned in your post.I am using Ubuntu 12.04 LTS and my HTC explorer is on the

stock ROM(not rooted).

I router is Nokia Siemens residential router 1600

I even have an inbuilt wireless adapter,but do not know which is it.Well,if this does not workout,I actually want to use WiFi to use internet on my mobile,but my router
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reboots whenever I connect my phone to it,possible bcoz of IP address conflicts,as it used to connect

to my ubuntu via wired and even by wireless,both.

Hoping for a quick reply.

Thanks,

Abhishek

vineethkartha | April 8, 2013 at 6:08 am

Hi abhishek,

if your router has a wireless adapter than why do you want to share net via you PC why dont you

connect your phone directly over wifi to your phone?

Abhishek khandal| April 8, 2013 at 1:46 pm

I have the Nokia Siemens wifi router,I have a wireless adapter in my CPU cabinet,and I have

this wireless option in my ubuntu which use this wireless adapter to connect to wifi by the

nokia wifi router.

The prob. is whenever I connect my phone to the the router to access internet,it reboots,possibly

bcoz of IP conflicts,but wired and wireless connection simultaneously connected works onUbuntu,there is no IP conflict problem on my PC,it is only on my HTC.

I tried your method to make use of wireless adapter or router to make it as a hotspot to which I

can connect my HTC to use internet,is there any other way possible where I do not have to root

my phone?

Thanks a ton

James | April 24, 2013 at 2:19 am

Not working for me. My phone gets stuck at the obtaining ip address.

This is what is in terminal

Using interface wlan0 with hwaddr 00:c0:ca:2f:a6:dd and ssid geekpeek

wlan0: STA 28:98:7b:64:5e:5c IEEE 802.11: authenticated

wlan0: STA 28:98:7b:64:5e:5c IEEE 802.11: associated (aid 1)

wlan0: AP-STA-CONNECTED 28:98:7b:64:5e:5c

wlan0: STA 28:98:7b:64:5e:5c RADIUS: starting accounting session 5176F1B0-00000000

wlan0: STA 28:98:7b:64:5e:5c WPA: pairwise key handshake completed (RSN)

wlan0: AP-STA-DISCONNECTED 28:98:7b:64:5e:5c

wlan0: STA 28:98:7b:64:5e:5c IEEE 802.11: disassociatedCould not set station 28:98:7b:64:5e:5c flags for kernel driver (errno=11).

wlan0: STA 28:98:7b:64:5e:5c IEEE 802.11: authenticated

wlan0: STA 28:98:7b:64:5e:5c IEEE 802.11: associated (aid 1)

wlan0: AP-STA-CONNECTED 28:98:7b:64:5e:5c

wlan0: STA 28:98:7b:64:5e:5c RADIUS: starting accounting session 5176F1B0-000000

James | April 24, 2013 at 2:27 am

Ok got it to connect but no internet.

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