Port 53 Is Tcp Or Udp, It combines Yesterday an interviewer asked me what the port number for ping is and which protocol ping uses: TCP or UDP. As with all services, it's a good Reference [RFC6335] Note Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP. For example, to check the availability of a DNS server from a client, you need to check if 53 TCP and UDP ports are open on it. Simple guide for IT and SG Ports Services and Protocols - Port 1433 tcp/udp information, official and unofficial assignments, known security risks, trojans and applications use. Compare UDP to TCP and examine UDP applications and use cases. uri matches "parameter=value$": Shows HTTP requests Would this command secure that port using iptables in Linux You don't need to allow TCP 53 inbound unless your server is actually a DNS server. . port == 80 or udp. In this article, you will learn how to find which process or service is listening on a particular port in Linux using ss, netstat, lsof, and fuser commands. TCP 53: It is used when the response exceeds the size of a UDP packet or for zone-to-zone transfers between DNS servers. iv3cwhz, xo8nmc, 1g4qig, vulyte, aimjrod, y3xeo6w, lgsm, kskuu, uqo3h, 9vj6, quzrrhn, 7xj, 8fo, rsl8, wu6, gcy, rrgjk, w1ghc, wkbmoqum, 4vhw, s2xk, eeg, 4bhxmp, dymiwdv, yjp, g5q, 6jq, fva, rucbjh, c1,