Is DNS TCP or UDP Port 53? | Infoblox DNS Security Center …
2020-5-27 dns udp tcp_phone1126的专栏-CSDN博客_dns udp 2020-5-26 · 使用条件客户端的防火墙禁止tcp出站流量,无法上网,dns2tcp利用dns协议传输tcp数据,从而实现上网(dns协议是udp协议走53端口)。dns2tcp常用命令-c 大流量压缩-F 前台运行-f 指定配置文件-r 指定使用的资源-z 指定DNS域名-k 设置传输密码-l 侦听本地 为什么 DNS 会使用 UDP 协议,假如使用 TCP 协议 … 2020-5-11 · DNS占用53号端口,同时使用TCP和UDP协议。那么DNS在什么情况下使用这两种协议?DNS在区域传输的时候使用TCP协议,其他时候使用UDP协议。DNS区域传输的时候使用TCP协议:1.辅域名服务器会定时(一般3小时)向主域名服务器进行查询以便了解数据是否有变动。 Allow Both TCP and UDP Port 53 to Your DNS Servers
Why does DNS use UDP? As you just read, the UDP is unreliable but a lot faster than TCP, but don’t panic just yet. DNS requests are very tiny, so they have no problems fitting into the UDP segments. It doesn’t use a time-consuming three-way hand-shake procedure to start the data transfer like TCP does.
2020-7-20 · One unique case where you would want to use UDP instead of TCP is where you are tunneling TCP over another protocol (e.g. tunnels, virtual networks, etc.). If you tunnel TCP over TCP, the congestion controls of each will interfere with each other. Hence one generally prefers to tunnel TCP over UDP (or some other stateless protocol). DNS什么时候使用TCP?什么时候使用UDP?-爱开源
When does DNS use TCP or UDP? - Network Interview
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