4. 设置服务端地址和NTP请求报文 struct sockaddr_in server_addr; memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(NTP_PORT); inet_pton(AF_INET, NTP_SERVER, &server_addr.sin_addr); 5. 发送请求并接收响应 ntp_packet packet;...
server_addr.sin_port=htons(portno); //printf("ipaddr (in hex): %x\n",server_addr.sin_addr); /* * build a message. Our message is all zeros except for a one in the * protocol version field * msg[] in binary is 00 001 000 00000000 * it should be a total of 48 bytes long ...
NTP服务使用的是UDP 123端口 防火墙开启状态下需开放123端口 [root@localhost ~]# /sbin/iptables -I INPUT -p udp --dport 123 -j ACCEPT 查看iptable 端口状态 [root@localhost ~]# /etc/init.d/iptables status 表格:filter Chain INPUT (policy ACCEPT) num target prot opt source destination 1ACCEPT...
In order to relieve the load and network congestion, you should avoid connecting directly to a stratum 1 server. when: the number of seconds that have elapsed since the last successful request. poll: the synchronization interval (in seconds) between local and remote servers. At the beginning, ...
Linux进阶部分又分了很多小的部分,我们刚讲完了Linux日常运维。...讲的那些东西都算是系统自带的,但是Linux作为一个服务器操作系统,肯定是要安装运行软件来满足我们的业务需要,本章基础软件部分,将从下面几个部分来讲解: Linux基础软件-软件安装 Linux基础软件...-yum(
Linux部署NTP服务器进行时间同步 NTP 是网络时间协议(Network Time Protocol)的简称,通过 udp 123 端口进行网络时钟同步 一、安装 # 既可做服务端也可做客户端 yum install -y ntp #...开启服务,让其他客户端与本机同步,注意防火墙状态 systemctl start ntpd # 开机自启 systemctl enable ntpd 二、ntp 常用配...
Linux kernel-level firewalling can also interfere with your clock synchronization. A typical problem is that your system's kernel firewall rejects incoming NTP packets. A simple measure to avoid this is to make sure UDP port 123 is open for incoming packets from your selected time servers. If...
NTP服务器软件使模块成为标准NTP网络时间服务器,并能通过客户端软件同步网内的WINDOWS9X/NT工作站,而WINDOWS 2000/XP/2003、LINUX、UNIX、SUN SOLARIS等操作系统及CISCO的路由器、交换机则可通过自带的NTP/SNTP客户端软件自动和网络时间服务器对时,从而实现网络授时功能。三、系统组成 系统由GPS/北斗天线、网络同步...
Linux下NTP服务器的配置 Linux下的ntp软件不但能自动与互联网上的时钟保持同步,同时本身已经是一台SNTP服务器了,可以供局域网内的电脑校对时间。服务配置如下: 第一步 安装软件包 我用的是RPM包安装的,或者到去下载xntp重新编译一个新的。 #rpm -qa | grep ntp ...
用於排除資料包捕獲中NTP問題的過濾器為:udp.port == 123。使用該過濾器,您可以看到CUCM發佈者與Google NTP伺服器建立了通訊,並且CUCM發佈者也與CUCM使用者進行了通訊。 CUCM的CLI輸出審查 utils ntp status輸出 NOTE: All nodes will show the current time in UTC regardless o...