Port 123 (tcp/udp) :: SpeedGuide
Connection to 192.168.0.10 123 port [udp/ntp] succeeded! Here we see from the output that the server 192.168.0.10 has ntp running on port 123 which make use of the udp protocol. Scan muliple ports: We can use netcat to scan for multiple ports by specifing each port in the nc command: Opening UDP port 123 - Cisco Community Re: Opening UDP port 123 NTP should be able to go out across your firewall just like HTTP requests do. Can you crank up NTP logging to make certain that those servers *ever* respond, as some publically listed NTP servers are dormant. UDP-Based Amplification Attacks | CISA By design, UDP is a connection-less protocol that does not validate source Internet Protocol (IP) addresses. Unless the application-layer protocol uses countermeasures such as session initiation in Voice over Internet Protocol, an attacker can easily forge the IP packet datagram (a basic transfer unit associated with a packet-switched network) to include an arbitrary source IP address. What’s the Difference Between TCP and UDP?
Nov 26, 2009
May 27, 2018 NTP (Network Time Protocol) - study-ccna.com Network Time Protocol (NTP) is an application layer protocol used for clock synchronization between hosts on a TCP/IP network. The goal of NTP is to ensure that all computers on a network agree on the time, since even a small difference can create problems. NTP uses a well-known UDP port 123. The current version is NTPv4, and it is backward
I read that UDP port 123 is the default NTP port but why are IPs from China sending UDP packets to my linux box? I don't even understand how the UDP packets are getting past my router. – Mauricio Ramalho Nov 15 '17 at 11:35. 2.
Solved: Different between port 123 (ntp) and 37 (timeserve