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Disable Avahi Publishing 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'

Uninstall DHCP Server Package If the system does not need to act as a DHCP server, the dhcp package can be uninstalled. The 'dhcp' package can be removed with the following command: '$ sudo yum erase dhcp'

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;'

Deny Decline Messages Edit '/etc/dhcp/dhcpd.conf' and add or correct the following global option to prevent the DHCP server from responding the DHCPDECLINE messages, if possible: 'deny declines;'

Deny BOOTP Queries Unless your network needs to support older BOOTP clients, disable support for the bootp protocol by adding or correcting the global option: 'deny bootp;'


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