DNS: What It Is and What It Does - dummies
May 28, 2010 Port Number - What is it & How to Find My Port Number? The port numbers will be shown after the IP address and the two are separated by a colon. For instance, if your IP address is something like 192. 168. 45. 2 and you’re being displayed an entry for 192. 168. 45. 2: 57961, it means the port number 57961 is open. What does a port scanner do? Basically, a port scanner probes a host or server for windows server 2008 - DNS.EXE allocates 5000+ ports Restart the DNS Server service: net stop dns && net start dns; Be aware that setting the value too low, effectively defeats the purpose of MS08-037. If you're on Windows Server 2008 R2 and just want to make sure that a number of individual UDP endpoints are not used by DNS, you can also specify a list of port ranges to be excluded from use by DNS: how to forward dns alias to hostname:port? - Server Fault
Jul 13, 2019
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. DNS Port - How to allow DNS through Firewall Jul 07, 2020 [SOLVED] Creating a DNS Record with a port number
DNS Server listeming on EXCESSIVE number of udp ports
Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port Is DNS TCP or UDP Port 53? | Infoblox DNS Security Center FAQ 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. DNS Port - How to allow DNS through Firewall Jul 07, 2020 [SOLVED] Creating a DNS Record with a port number