Jun 27, 2013 · The DNS forwarder should be thought of as the designated server to which a particular subset of queries (either for external addresses or specific internal addresses) are forwarded by other DNS servers within the network. It then sends (forwards) those requests for resolution to other DNS servers. Why Use DNS Forwarding For External Addresses?
TCP and UDP ports used by Apple software products Aug 27, 2019 Which TCP ports does a workstation use to authenticate to May 31, 2011
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Nov 12, 2012 · What port does DNS use? A. 443. B. 389 C. 51 D. 53. Explanation: Section Reference: Defining DNS DNS servers use inbound port 53 to accept name-resolution requests. Everyone knows that DNS servers use UDP port 53 for queries, right? Well something that I recently learned was that DNS servers also use TCP port 53 to do zone transfers (axfrs). Make sure to open that port up in your firewall if you are allowing zone transfers from your DNS server. Knowing that sooner could have saved me a lot of time! DNS servers (since they use UDP) don’t have to keep connections. 2) DNS requests are generally very small and fit well within UDP segments. 2) UDP is not reliable, but reliability can added on application layer. An application can use UDP and can be reliable by using a timeout and resend at the application layer.
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Configuring Routers To Use Dynamic DNS and Port Forwarding Jul 06, 2008 Multicast DNS - Wikipedia