WiFi access point with wpa_supplicant

If you have Linux desktop connected to the Internet (wire, LTE modem) and it has a wifi card which is managed by wpa_supplicant, you can easily setup this computer as WiFi access point. You even don't need hostapd - just wpa_supplicant and dhcp server software.

Follow these steps:

wpa_supplicant should be compiled with ap USE flag:

echo 'net-wireless/wpa_supplicant ap' | sudo tee -a /etc/portage/package.use

Configure wpa_supplicant.conf as follows (mode=2 is Access Point mode, for more see documentation):
```
network={
    ssid="AP-NAME"
    mode=2
    key_mgmt=WPA-PSK
    psk="password"
    frequency=2437
}
```
You can choose right frequncy according to the table on wikipedia.
Install and setup DHCP server. I'm using net-misc/dhcp with server USE flag:
```
echo 'net-misc/dhcp server' | sudo tee -a /etc/portage/package.use
```

Configure /etc/dhcp/dhcpd.conf

subnet 192.168.6.0 netmask 255.255.255.0 {
  range 192.168.6.20 192.168.6.30;
  option domain-name-servers 8.8.8.8;
  option routers 192.168.6.1;
  option broadcast-address 192.168.6.255;
  default-lease-time 600;
  max-lease-time 7200;
}

Start wifi interface, controlled by wpa_supplicant and DHCP server:

sudo /etc/init.d/net.wifi start
sudo ifconfig wifi 192.168.6.1/24
sudo mkdir /var/run/dhcp
sudo touch /var/lib/dhcp/dhcpcd.leases
sudo /usr/sbin/dhcpd -f -user dhcp -group dhcp wifi

Setup forwarding. Suppose 192.168.4.2 wired to the Internet

sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING --source 192.168.6.0/24 -j SNAT --to 192.168.4.2

That's all! Now you can connect to your Access Point. All these

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