![]() MDNS uses UDP port 5353, which still needs to be opened on the Ubuntu firewall: $ sudo ufw allow 5353/udp Step 5: Disable IPv6 In many manuals you can find the restriction of network interfaces via the parameter “allow-interfaces=…” However, this is not necessary if the server is only active as mDNS Reflector. $ sudo nano /etc/avahi/nfįollowing lines need to be changed ![]() The configuration can be edited with any editor (here nano). The mDNS Reflector function is disabled by default and commented out in the configuration. $ sudo apt-get install avahi-daemon avahi-utils Step 3: Configure Avahiīy default, avahi is an mDNS server and advertises its own services. Install Avahi and some supportive packages. Otherwise the interfaces have to be configured. If DHCP is available in the printer network as well as in the client network, the server can be installed in the default settings without any problems. I recommend to install openSSH as well, this simplifies the administration. Installation of Avahi – Step by Step Step 1: Install Ubuntu Server Below is a short tutorial for the installation of an Avahi mDNS reflector on an Ubuntu Server VM. Avahi has proven to be a good mDNS reflector. In this case you have to use a small Linux VM with a network interface in the client network as well as in the printer network. Sophos XG) do not support mDNS reflectors. OpenWrt), the function can be installed or configured later. UniFi USGs) already have this integrated and enabled by default. The solution for this problem are mDNS reflectors. Since multicast queries are not routed by default, the query from the client network never gets forwardet to the printer network despite routing. In principle, with a multicast query, all compatible devices populate which services are offered under which port. Multicast DNS (this is the full name of mDNS) is, as the name suggests, a multicast protocol. The cause of the problem is that AirPrint finds the printers with mDNS (called Bonjour in Apple jargon). The printers are no longer found on mobile devices such as iPhones and iPads, even if you set up routing between the client and printer networks and open all ports from the client network to the printer network. ![]() The problem is that AirPrint no longer works when printers are segmented into their own subnets. It is common practice to move multifunction devices and printers into seperate network segments and make them accessible to the user via the print server only. Nowadays, all network administrators should know that flat network structures are particularly not a good idea. ![]()
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