先到www.changeip.com注册个动态域名.
然后到邮箱激活.
然后到 Winbox－system-Scheduler-添加:Name:随便 Interval：多少时间检测一次IP我设为00:20:00
在 On Event: 里写入下面的

=============================================================
:log info "DDNS: Begin"
:global ddns-user "用户名"
:global ddns-pass "密码"
:global ddns-host "*1"
:global ddns-interface "外线接入名(如adsl1)"
:global ddns-ip [ /ip address get [/ip address find interDDNS: No ip address present on " . $ddns-interface . ", please check.")
} else={
  :if ($ddns-ip != $ddns-lastip) do={
    :log info "DDNS: Sending UPDATE!"
    :log info [ /tool dns-update name=$ddns-host address=[:pick $ddns-ip 0 [:find $ddns-ip "/"] ] key-name=$ddns-user key=$ddns-pass ]
    :global ddns-lastip $ddns-ip
  } else={
    :log info "DDNS: No change"

}
:log info "DDNS: End"

 

:global ddns-interface [ /interface find type=pppoe-out ]＂pppoe-out 的名字＂
:global ddns-ip [ /ip address get [/ip address find inter/"] ] key-name=用户名 key=密码

在做一个NETWATCH

让他每次自动进行修正IP地址，若你的网关不通，可以用DNS