Package: netbase Version: 5.4 Severity: normal Precision Time Protocol (PTP), IEEE 1588-2008 aka IEEE 1588 v2 / PTPv2.
https://en.wikipedia.org/wiki/Precision_Time_Protocol#Message_transport """ PTP messages may use the User Datagram Protocol over Internet Protocol (UDP/IP) for transport. [...] Event messages are sent to port number 319. General messages use port number 320. """ https://doi.org/10.1109/IEEESTD.2008.4579760 https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers Lists ports 319 and 320 as officially well known UDP port for PTP. Usually over local Gigabit Ethernet networks. https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?&page=6 (page 6) lists them too: Service Name Port Number Transport Protocol Description Assignee Contact Registration Date Modification Date Reference Service Code Known Unauthorized Uses Assignment Notes ... ptp-event 319 tcp PTP Event [Kang_Lee] [Kang_Lee] 2010-07-27 ptp-event 319 udp PTP Event [Kang_Lee] [Kang_Lee] 2010-07-27 ptp-general 320 tcp PTP General [Kang_Lee] [Kang_Lee] 2010-07-27 ptp-general 320 udp PTP General [Kang_Lee] [Kang_Lee] 2010-07-27 In practice only UDP is defined in standards and used in the wild. I also spotted it in /usr/share/nmap/nmap-services from nmap-common package. Thanks. -- System Information: Debian Release: buster/sid APT prefers testing-debug APT policy: (500, 'testing-debug'), (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.17.0-1-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled -- no debconf information
