Network

Helpful Network Commands

Add a Virtual Interface

• : Can be anything you like like ap0 if you wanted to create a Virtual Access Point.
• : One of the following
  • __ap: Access Point mode.
  • ibss: Independent Basic Service Set or Ad-Hoc (Group of devices talk to eachother).
  • monitor: Passive monitoring mode where packets are handed to OS unfiltered
  • mp: Mesh Point or a device in a mesh network.
  • station

    # iw dev wlan0 interface add <name> type <type>
    iw dev wlan0 interface ap0 type __ap
    # You may also need to assign ap0 its own MAC Address, see "Change Device MAC Address"
    

Change Device MAC Address

# ip link set dev <dev-name> address <new-mac-address>
ip link set dev ap0 address 00:12:34:56:78:9c

Extra Steps for AP Mode

• Either set up and configure hostapd as AP daemon or use nmcli to set up an AP with NetworkManager and pick ap0 as the interface.
• For both configurations dnsmasq is used to assign the connecting clients on the ap0 interface IP addresses via DHCP.
  • With hostapd you likely will need to configure /etc/dnsmasq/dnsmasq.conf. NetworkManger does this part for you.
• Use iptables to set up ip masquerading
• Enable IPv4 forwarding in kernel via /etc/sysctl