动态域名更新的实现方法

一、首先说明，本篇受“情灭缘尽”转帖的脚本启发，其发布的原始脚本如下：# Dynamic DNS Update Script v1.1# ------------------------------# This script will perform automatic dynamic dns updates on the Mikrotik# router platform. (/) Since Mikrotik does not# support sending http requests we have created a smtp -> ddns proxy service # which will take the http URL querystring used for a dynamic dns update and # process it via email.# ------------------------------# Written by Sam Norris, # 7/31/04 - Created script.# 12/9/04 - Made some values dynamic (smtp server, dhcp interface)# ------------------------------## Instructions:# There are a few variables down below that you need to configure for your # specific setup. Please modify the variables in the 'ddnsInit' script to# reflect your specific information, ie userid, password, hostname to update. ## Blow away any existing script code, if necessary./system scheduler remove ddnsJob/system script remove ddnsCheck/system script remove ddnsInit/system script remove ddnsReset/system script remove ddnsSendUpdate# Setup global variables needed to keep track of changing IP address./system script add name="ddnsInit" source={:log message="ddnsInit: Creating Dynamic DNS update system."# ENTER YOUR USER ID HERE.:global u:set u "USERID"# ENTER YOUR PASSWORD HERE.:global p:set p "PASSWORD":global s:set s "Mikrotik"# ENTER THE TARGET HOSTNAME TO UPDATE, *1 is Set 1.:global h:set h "*1":global dhcpInterface:set dhcpInterface [ /ip dhcp-client get interface ]:log message=("ddnsInit: Found dhcp interface " . $dhcpInterface )# EMAIL PROXY ADDRESS - DO NOT CHANGE FOR PRODUCTION.:global ddnsProxyEmail:set ddnsProxyEmail "ddnsUpdate@"# ENTER YOUR EMAIL ADDRESS FOR CONFIRMATIONS.:global ddnsFromEmail:set ddnsFromEmail "youremail@domain.tld"# SMTP DDNS PROXY SERVER - CHANGE ONLY IF NECESSARY (port 25 blocked?) :global ddnsSmtpServer:set ddnsSmtpServer [:resolve ]:global a:set a [ \/ip address get \[/ip address find interface=$dhcpInterface] \address \]}/system script add name="ddnsCheck" source={:if ([/system scheduler get ddnsJob run-count]<=1) do={/system script run ddnsInit}:global temp:global b:set temp $a:set b [ \/ip address get \[/ip address find interface=$dhcpInterface] \address \]:if ($temp != $b) do={:log message="ddnsCheck: Found new IP address."/system script run ddnsSendUpdate:set a $b}}/system script add name="ddnsSendUpdate" source={:log message=("ddnsSendUpdate: Sending Dynamic DNS smtp update to " . $ddnsSmtpServer) /tool e-mail send \to=$ddnsProxyEmail \from=$ddnsFromEmail \server=$ddnsSmtpServer \subject="New Dynamic IP" \body=("u=" . $u . "&p=" . $p . "&hostname=" . $h . "&system=" . $s . "&myip=" . $b)}/system script add name="ddnsReset" source={:log message="ddnsReset: Resetting global values."/system scheduler set ddnsJob run-count=0:unset u:unset p:unset s:unset h:unset dhcpInterface:unset ddnsProxyEmail:unset ddnsFromEmail:unset ddnsSmtpServer:unset a:unset b:unset temp}/system scheduler add name=ddnsJob interval=30s on-event=ddnsCheck二、红色部分是需要根据个人注册的信息填写三、黄色部分是我要着重解释的，也是成功的关键。

四、具体说明：1、该脚本是基于网站申请的免费动态域名，大家可自行申请；2、该脚本的原始作者sam norris就是的运行者，故此，这个脚本在ros下是绝对支持申请的域名，至于其他国内的类似等我还没有试过，不知可不可以；3、:global dhcpInterface:set dhcpInterface [ /ip dhcp-client get interface ]:log message=("ddnsInit: Found dhcp interface " . $dhcpInterface )这是本文的关键部分，sam norris是基于dhcp客户机的架构来设置他的动态域名，而国内用户主要关心的是adsl拨号下得动态域名解析，dhcinterface是一个全局变量，他代表的是dhcp客户机的接口号，也就是分到ip地址的接口设备名，这个变量名可以不改，但如何取得你的系统中adsl设备的接口号呢？请将[/ip dhcp-client get interface] 改为[/interface find type=pppoe-out],好了，dhcpinterface的值就变成了你所建立的adsl拨号接口号了，ros内部的表示一般为*3，当然这个不用关心。

至此，你所要做的就是等待了；4、关于脚本的建立我在此就不多说了，大家只要把上述脚本的各个部分复制-粘帖到命令交互界面，自然会生成，正确的结果是生成四个脚本，分别为：ddnsCheck,ddnsInit,ddnsReset,ddnsSendUpdate;同时生成一个名字为ddnsJob的计划日程。

最后祝大家成功，ros自己能做的事情自己做，从此摆脱ros+windows +域名客户软件的日子。