Difference between revisions of "DHCP server"

Latest revision as of 19:14, 24 April 2018

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.

Installation

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

Usage

• 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)
dhcp-range=192.168.10.10,192.168.10.20,12h

• 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):

local=/opossom.lan/
domain=opossom.lan

• then update the /etc/hosts file with IP of machines that should be mapped to newly created opossom.lan domain. For example:

192.168.10.1    mysystem.armadeus.lan

where 192.168.10.1 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 192.168.10.1.

Links

• https://linux.die.net/man/8/dnsmasq
• https://wiki.archlinux.org/index.php/dnsmasq
• https://antanas.veiverys.com/how-to-enable-dhcp-on-usb-gadget/