Dec 01, 2016
Mike I followed your instructions and set up the firewall. I rebooted the computer and checked the firewall settings again and shows open. When I use the scanany app from my smart phone (on the same network) I only see UDP ports 137, 1900, 5353, & 5355 open. Attention! TCP guarantees delivery of data packets on port 3481 in the same order in which they were sent. Guaranteed communication over TCP port 3481 is the main difference between TCP and UDP. UDP port 3481 would not have guaranteed communication as TCP. Sep 17, 2013 · Is it possible to set only use one port for port forwarding? Example I only set port 65534 for the port range of the torrent port forwarding. Or I must set a range of port no. example 49152-65534 to make it works? The protocol that I need to set is apply for Both (TCP & UDP)? Thanks. The ProtonVPN app’s default port is 1194 for UDP (which is the default port for OpenVPN) and 443 for TCP. However, the app is configured to work with other ports for both UDP and TCP. These ports are backups in case the main ports are blocked. Apr 10, 2017 · TCP: World Wide Web (Apache TCP port 80), e-mail (SMTP TCP port 25 Postfix MTA), File Transfer Protocol (FTP port 21) and Secure Shell (OpenSSH port 22) etc. UDP: Domain Name System (DNS UDP port 53), streaming media applications such as IPTV or movies, Voice over IP (VoIP), Trivial File Transfer Protocol (TFTP) and online multiplayer games etc.
Feb 28, 2019
TCP et UDP sont les deux protocoles principaux de la couche transport. Lors de la configuration d'un routeur ou d'une box internet, il n'est pas rare d'avoir à choisir entre les ports TCP et les DNS port 53 (udp) is for a client to query a server. This is the standard method of pulling down a single query from a DNS server and is by far the most commonly used form of DNS . DNS port 53 (tcp) is used for server-to-server communications (typ) when one server is requesting a zone transfer of the entire zone. Check UDP connection to any port of any IP or website from different places. For example you could check a DNS or game server for availability from many countries. Examples: 8.8.8.8:53. domain://8.8.4.4. cw.live-cs.ru:27997
TCP and UDP ports | Nmap
Jul 03, 2017 · You’ve probably seen references to TCP and UDP when setting up port-forwarding on a router or when configuring firewall software. These two protocols are used for different types of data. TCP/IP is a suite of protocols used by devices to communicate over the Internet and most local networks. 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. A process associates its input or output channels via an Internet socket , which is a type of file descriptor , with a transport protocol , an IP address , and a port number. The answer is DNS is mostly UDP Port 53, but as time progresses, DNS will rely on TCP Port 53 more heavily. DNS has always been designed to use both UDP and TCP port 53 from the start 1, with UDP being the default, and fall back to using TCP when it is unable to communicate on UDP, typically when the packet size is too large to push through in a single UDP packet.