Which port does dns use

DNS Port - How to allow DNS through Firewall

Mar 29, 2020 · SMB uses either IP port 139 or 445. Port 139: SMB originally ran on top of NetBIOS using port 139. NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack. Using TCP allows SMB to work over the > leave port 53 open for DNS. However, it appears that nslookup stops working > and can't find the "default" nameserver. > > Question: What TCP/IP or UDP port does NSLOOKUP need to operate > on besides port 53? Does anyone know that. nslookup sends queries from a dynamically assigned ephemeral port to port 53. cricket. Acme Byte & Wire cri DNS Spoofing Attack: A high rate of DNS traffic with a source port of 53 (attacker) destined to an unprivileged port (above 1024) for a DNS resolver (attack target). DNS Cache Poisoning Attack: A high rate of DNS traffic with a source port of 53 (attacker) destined to a DNS server on your network (attack target). May 31, 2011 · Hello, I am working on rolling out an isolated VLAN where I'd like to be able for the users to utilize several services provided. For instance, I'd like to allow access to for DNS, AD authentication, and group policy. The IP address of a DNS server. To specify multiple DNS servers, use multiple --dns flags. If the container cannot reach any of the IP addresses you specify, Google’s public DNS server 8.8.8.8 is added, so that your container can resolve internet domains.--dns-search: A DNS search domain to search non-fully-qualified hostnames. DNS Port(s) From: Men & Mice Support Date: Saturday, March 4, 2000 Time: 11:11:00 am At 10:00 AM +0000 3/4/2000, Simon Forster wrote: >Quick ? > >DNS services happen on port 53 but how/what ports does QuickDNS use to >transfer data for secondary services. > >Perhaps I should explain. I have my QuickDNS server behind a firewall. Aug 27, 2019 · 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.

Mar 29, 2020 · SMB uses either IP port 139 or 445. Port 139: SMB originally ran on top of NetBIOS using port 139. NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack. Using TCP allows SMB to work over the

Port 80 is the default web server port and IIS would use Port 80 unless configured to use a different port. If it uses the UDP protocol to send and receive data, it will use a UDP port. Figure 1, below, is a represenation of an IP address split into its many TCP and UDP ports.

Jun 30, 2016 · Messages are sent over UDP and DNS servers bind to UDP port 53. When the message length exceeds the default message size for a User Datagram Protocol (UDP) datagram (512 octets), the first response to the message is sent with as much data as the UDP datagram will allow, and then the DNS server sets a flag indicating a truncated response.

What Is DNS Server Or Protocol Port Number? – POFTUT DNS is provided over intranet and internet servers with different port numbers. TCP or UDP. DNS can use both transmission protocols TCP and UDP. But general usage is over UDP protocol because of its simplicity and speed. TCP Port 53. One of the used DNS port is TCP Port 53. TCP provides stability over DNS resolutions process. Is DNS TCP or UDP Port 53? | Infoblox DNS Security Center FAQ