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What port is DNS requests on?

03/08/202203/08/2022| Shirley GriffinShirley Griffin| 0 Comment | 12:00 AM
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What port is DNS requests on?

Port 53
The answer is DNS is mostly UDP Port 53, but as time progresses, DNS will rely on TCP Port 53 more heavily.

What is port 53 DNS used for?

DNS uses Port 53 which is nearly always open on systems, firewalls, and clients to transmit DNS queries. Rather than the more familiar Transmission Control Protocol (TCP) these queries use User Datagram Protocol (UDP) because of its low-latency, bandwidth and resource usage compared TCP-equivalent queries.

Should I open port 53?

You don’t need to allow TCP 53 inbound unless your server is actually a DNS server.

Is DNS port 53 secure?

The DNS protocol – operating on UDP port 53 for normal requests – is used as a means of “tunnelling” through security systems to steal data. The channel is not normally used for sending information and so is not always monitored by security systems.

What port does DNS operate on?

Echo,port 7,RFC 862

  • Discard,port 9,RFC 863
  • Character Generator,port 19,RFC 864
  • Daytime,port 13,RFC 867
  • Quote of the Day,port 17,RFC 865

    • How to redirect to specific port from DNS?

    Prerequisites. Have the OPNsense software installed.

  • Table of contents
  • Reason for redirecting DNS requests to local DNS resolver.
  • Creating a DNS redirection NAT Port forward rule.
  • Configuration of multiple interfaces.
  • Testing the redirection.
  • Conclusion.

    • What is the difference between a DNS port and UDP?

    UDP never restricts the users to a communication model that is connection-based.

  • The startup latency in any distributed application with UDP remains low.
  • It also offers multicast and broadcast transmission.
  • The recipient of UDP packets can unmanage them.
  • UDP can also make up for data loss.
  • It offers small transactions like the DNS lookup.

    • Can DNS point to specific port?

    DNS only points to the IP address. The port to connect to for a particular service is determined by convention. For example the default port for HTTP is 80, the default port for HTTPS is 443, and the default port for SSH is 22. The only way to override the default port is to specify it in the URL (or on the command line for something like SSH).

    https://www.youtube.com/watch?v=FU_WoPMC5-Q