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Disable Avahi Server Software The 'avahi-daemon' service can be disabled with the following command: '$ sudo systemctl disable avahi-daemon'

Serve Avahi Only via Required Protocol If you are using only IPv4, edit '/etc/avahi/avahi-daemon.conf' and ensure the following line exists in the '[server]' section: 'use-ipv6=no' Similarly, if you are using only IPv6, disable IPv4 sockets with the line: 'use-ipv4=no'

Check Avahi Responses' TTL Field To make Avahi ignore packets unless the TTL field is 255, edit '/etc/avahi/avahi-daemon.conf' and ensure the following line appears in the '[server]' section: 'check-response-ttl=yes'

Prevent Other Programs from Using Avahi's Port To prevent other mDNS stacks from running, edit '/etc/avahi/avahi-daemon.conf' and ensure the following line appears in the '[server]' section: 'disallow-other-stacks=yes'

Restrict Information Published by Avahi If it is necessary to publish some information to the network, it should not be joined by any extraneous information, or by information supplied by a non-trusted source on the system. Prevent user applications from using Avahi to publish services by adding or correcting the following line in the '[publish]' section: 'disable-user-service-publishing=yes' Imp ...

Disable the CUPS Service The 'cups' service can be disabled with the following command: '$ sudo systemctl disable cups'

Disable Printer Browsing Entirely if Possible By default, CUPS listens on the network for printer list broadcasts on UDP port 631. This functionality is called printer browsing. To disable printer browsing entirely, edit the CUPS configuration file, located at '/etc/cups/cupsd.conf', to include the following: 'Browsing Off'

Disable Print Server Capabilities To prevent remote users from potentially connecting to and using locally configured printers, disable the CUPS print server sharing capabilities. To do so, limit how the server will listen for print jobs by removing the more generic port directive from /etc/cups/cupsd.conf: 'Port 631' and replacing it with the 'Listen' directive: 'Listen localhost:631' This will ...

Disable DHCP Service The 'dhcpd' service should be disabled on any system that does not need to act as a DHCP server. The 'dhcpd' service can be disabled with the following command: '$ sudo systemctl disable dhcpd'

Do Not Use Dynamic DNS To prevent the DHCP server from receiving DNS information from clients, edit '/etc/dhcp/dhcpd.conf', and add or correct the following global option: 'ddns-update-style none;'


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