RFC 7766 - DNS Transport over TCP - Implementation
2010-9-28 · This is the IP of the UDP DNS server that we will connect whenever we get a DNS-over-TCP request. The way we perform DNS over TCP is as follows: The resolver or end user connects via TCP to the zoneserver daemon. The resolver sends a DNS query over TCP. The zoneserver program converts the query in to a UDP query. How does the DNS protocol switch from UDP to TCP? 2020-5-27 · All I keep hearing is "if the answer is too long, DNS will use TCP". This does not explain how it happens though. So here's the situation: DNS client asks for resolution of a record using UDP. The record is too long for UDP: server answers with specific opcode, to have client switch to TCP; server doesn't answer at all, and client re-tries over TCP TCP/UDP 常用端口列表 - 尘尘test - 博客园 2018-5-30 · 53/TCP,UDP DNS （域名服务系统） 官方 56/TCP,UDP 远程访问协议 官方 57/TCP MTP，邮件传输协议 67/UDP BOOTP（BootStrap协议）服务；同时用于动态主机设置协议 官方 68/UDP Is FTP a TCP or UDP protocol? | AnswersDrive
DNS uses UDP instead of TCP. If a DNS packet is lost, there is no automatic recovery. Does this cause a problem, and if so, how is it solved. check_circle Expert Answer. Step 1. The ways in which the DNS uses UDP: DNS server uses connectionless messaging. UDP is a connectionless protocol.
DNS uses UDP instead of TCP. If a DNS packet is lost, there is no automatic recovery. Does this cause a problem, and if so, how is it solved. check_circle Expert Answer. Step 1. The ways in which the DNS uses UDP: DNS server uses connectionless messaging. UDP is a connectionless protocol.
Apr 04, 2020 · When does DNS use TCP or UDP There are quite is few services which may use both TCP and UDP protocol while communicating. The primary reason is based on type of request/response which needs to be furnished.Before we further drill into detail of protocol type used in DNS , lets have a quick run through TCP and UDP protocols.
When does DNS use TCP instead of UDP? Why? - Quora It has to do with the requirements put on the data transfer. UDP is used when you need a translation of a domain name. Client sends a question DNS server answers with IP(if it has it in its record). All done with simple Datagram packets. No worry DNS or other Services works on both TCP and UDP 2017-2-14 · DNS uses TCP for Zone transfer and UDP for name queries either regular (primary) or reverse. UDP can be used to exchange small information whereas TCP must be used to exchange information larger than 512 bytes. If a client doesn't get response from DNS it must re-transmit the data using TCP after 3-5 seconds of interval. Why DNS Works On Both TCP and UDP - TechGenix 2009-10-31 · This communication happens between DNS Servers only. The Zone Transfer feature of DNS Server will always use TCP protocol. The connection is established between the DNS Server to transfer the zone data and Source and Destination DNS Servers will make sure that data is consistent by using TCP ACK bit. DNS uses UDP for DNS Queries over Port: 53