DHCP server

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This page will summarize the steps to install a DHCP server on your APF/OPOS. You might want that kind of server when, for example, your board is configured as a Wi-Fi access point or runs a webserver accessible from USB Network Gadget.


Recommended DHCP server for embedded usage is dnsmasq. This daemon can also serve as DNS & TFTP server (see below).

If you have a recent OPOS6UL/OPOS6UL_NANO BSP, then it is installed by default. Otherwise:

$ make menuconfig
Target packages  --->
    Networking applications  --->
        [*] dnsmasq
        [*]   tftp support
        [*]   dhcp support
        [ ]   DNSSEC support
        [ ]   IDN support
        [ ]   conntrack marking support


  • dnsmasq is automatically launch at system startup, when /etc/dnsmasq.conf configuration file exists.

So take your favorite text editor and create /etc/dnsmasq.conf with following informations (adapt interface name (here usb0 & IP addresses to the network you want to setup):

interface=usb0                         (wlan0 or uap0 for Wi-Fi AP)
  • then reboot your board and it should be up and running

DNS server

  • dnsmasq can also be configured as a local DNS server. Add the following lines to /etc/dnsmasq.conf to activate this functionality (here we define a new domain):
  • then update the /etc/hosts file with IP of machines that should be mapped to newly created opossom.lan domain. For example:    mysystem.armadeus.lan

where is the SOM local IP adress on the network interface registered in /etc/dnsmasq.conf

  • Restart dnsmasq:
# /etc/init.d/S80dnsmasq restart
  • then your SOM should be available with mysystem.armadeus.lan on your local network. If your PC is connected to this local network, drill is a nice command line tool to check mysystem.armadeus.lan name is correctly pointing to