Is UDP protocol safe?
No, neither of the protocols are secure. TCP being stateful protocol is reliable. UDP is a stateless protocol making it unreliable. I think the point of secure meaning on TCP is, there is absolute guarantee that the data transferred remains intact and arrives in the same order in which it was sent.
Why UDP is not secure?
UDP has no algorithm for verifying that the source of the sending packet is the source that it seems to be. An attacker can therefore eavesdrop on UDP/IP packets and make up a false packet pretending the packet is sent from another source (spoofing).
What is the lowest TCP port number?
A port number is a 16-bit unsigned integer, thus ranging from 0 to 65535. For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port.
What is the problem with UDP port 5351?
UDP on port 5351 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 5351 thinks that error checking and correction is not necessary or performed in the application, avoiding the overhead of such processing at the network interface level.
Why can’t I configure UDP or TCP ports in my firewall?
Some firewalls allow selective configuration of UDP or TCP ports with the same number, so it’s important to know the type of port you’re configuring. For example, NFS can use TCP 2049, UDP 2049, or both. If your firewall doesn’t allow you to specify the type of port, configuring one type of port probably configures the other.
What is UDP protocol used for?
UDP (User Datagram Protocol) is a minimal message-oriented Transport Layer protocol (protocol is documented in IETF RFC 768). Application examples that often use UDP: voice over IP (VoIP), streaming media and real-time multiplayer games.