In case you do not already have a router or your existing router cannot be set up accordingly, any machine which fulfills the requirements for a minimal Debian installation and which has at least two network interfaces can be turned into a gateway between the existing network and the Debian Edu one. See <link linkend="Installation--Installing_a_gateway_using_debian-edu-router">installation documentation</link> for a simple way to install and set up a Debian machine using <computeroutput>debian-edu-router-config</computeroutput>.