Hostap

HostAP adalah salah satu driver perangkat IEEE 802.11 paling populer untuk Linux dan sejak November 2016 secara resmi usang di kernel Linux. hostap bekerja dengan card yang menggunakan chipset Conexant (sebelumnya Intersil) Prism 2 / 2.5 / 3 dan mendukung mode HostAP, yang memungkinkan card WLAN untuk melakukan semua fungsi node access wireless.

Kode driver ditulis oleh Jouni Malinen, disewa oleh Atheros pada tahun 2008, dan dimasukkan ke dalam tree kernel utama di Linux 2.6.14.

This project includes three main components:

   Host AP - Linux driver for Prism2/2.5/3
   hostapd - user space daemon for access points, including, e.g., IEEE 802.1X/WPA/EAP Authenticator for number of Linux and BSD drivers, RADIUS client, integrated EAP server, and RADIUS authentication server
   wpa_supplicant user space IEEE 802.1X/WPA supplicant (wireless client) for number of Linux, BSD, and Windows drivers

Sharing 3G internet over Wi-Fi using HostAPd under Ubuntu Linux How to use your 3G card on three machines at once.

[UPDATE: There is an easier way to do this now. Recent versions of Ubuntu have an option in the Network Manager GUI to share one internet connection over a LAN or WLAN. So the following notes are for background only.]

In case they are useful, I've pasted below this message the Linux config files needed to share a 3G internet connection over WPA Wi-Fi, by using Ubuntu Linux and HostAPd to make your own wireless access point.

I used this setup today to share a 3G connection from Linux to an XKryptor VPN laptop, and to an iPhone accessing the iTunes store. (Aside: the iPhone has its own 3G connection, but due to Apple / O2 policy, it refuses to download podcasts >10MB unless it thinks it's on Wi-Fi! Another solution for that might be to jailbreak the iPhone using Pwnage Tool, install HostAPd on it, then see if it will connect to itself...)

Anyway, here goes... Of course you'll need to tweak these files slightly to set your own ESSID and WPA passphrase. These files are taken from a laptop using an Atheros WLAN card and MadWifi drivers, running Ubuntu 7.04 Feisty Fawn. Your mileage may vary if you have a different configuration, but Ubuntu comes with commented templates for the various config files, so you can always read those as a starting point if something doesn't work.

   Bring up the 3G card with KPPP (say) under Ubuntu Linux. The 3G thingy will be ppp0.

   Configure /etc/hostapd/hostapd.conf

       interface=ath0
       driver=madwifi

       ctrl_interface=/var/run/hostapd
       ctrl_interface_group=0

       ssid=your_ssid_here
       max_num_sta=255
       macaddr_acl=0
       auth_algs=3

       wme_enabled=0
       ieee8021x=0
       eapol_key_index_workaround=0
       eap_server=0
       own_ip_addr=127.0.0.1

       wpa=1
       wpa_passphrase=your_ultra_secret_keyphrase_goes_here
       wpa_key_mgmt=WPA-PSK
       wpa_pairwise=TKIP
       wpa_group_rekey=600
       wpa_gmk_rekey=86400

   Configure /etc/dhcp3/dhcpd.conf. (XK VPN users, please change the 10.x.x.x range to avoid a clash due to a bug in the XK VPN concentrator...)

       ddns-update-style none;

       default-lease-time 600;
       max-lease-time 7200;

       log-facility local7;

       option domain-name-servers 208.67.220.220,208.67.222.222 ;
         subnet 10.42.43.0 netmask 255.255.255.0 {
         range 10.42.43.50 10.42.43.70;
         option subnet-mask 255.255.255.0;
         option broadcast-address 10.42.43.255;
         option routers 10.42.43.1;
         }

   Create a script to fire it all up when required:

       cat > /usr/local/sbin/gohostapd
       #/bin/sh

       rmmod ath_pci

       modprobe ath_pci autocreate=ap

       iwconfig ath0 mode Master freq 2.42G essid your_ssid_here
       sleep 2
       ifconfig ath0 10.42.43.1/24

       iptables -t nat -A POSTROUTING -s 10.42.43.0/24 -o ppp0 -j MASQUERADE
       iptables -A FORWARD -s 10.42.43.0/24 -o ppp0 -j ACCEPT
       iptables -A FORWARD -d 10.42.43.0/24 -m state --state
       ESTABLISHED,RELATED -i ppp0 -j ACCEPT

       echo 1 >/proc/sys/net/ipv4/conf/all/forwarding

       echo 'INTERFACES=ath0' >/etc/default/dhcp

       dhcpd3 ath0

       hostapd -d /etc/hostapd/hostapd.conf

Once hostapd is running, you can run hostapd_cli to monitor the clients.

You might want to disable any Linux network services before running this. My machine doesn't offer any open network ports, so I haven't bothered checking the iptables rules too closely - they just do the NAT stuff so that traffic from the Wi-Fi clients gets routed properly.

Hostap

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