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 百度上找到的脚本，尝试过不少脚本，都没有成功，经过摸索，修改了脚本，以下是2.8X版本通过的脚本。
红色部分替换你的域名管理的 帐号 密码 和 二级域名，蓝色部分是 ADSL 拨号网卡名称。
域名申请地址 https://www.changeip.com/signup.asp?
使用说明：申请完成后，复制以下内容到 WINBOX 下的 SYSTEM-Scheduer 点+ 在NAME

:global ddnsuser "username"
:global ddnspass "password"
:global ddnshost "username.changeip.net"
:global ddnsip
:global ddnsipfn
:global ddnslastip [:tostr [:resolve $ddnshost] ]
:if ([ :typeof $ddnslastip ] = nil ) do={ :global ddnslastip "0" }
:global ddnsinterface "pppoe-out1"
:global ddnssystem ("mt-" . [/system package get system version] )
:local int
:local ddnsipfn [ /ip address get [/ip address find interface=$ddnsinterface ] address ]
:global ddnsip [:pick $ddnsipfn 0 [:find $ddnsipfn "/" ] ]
:if ([ :typeof $ddnsip ] = nil ) do={
:log info ("DDNS: No ip address present on " . $ddnsinterface . ", please check.")
} else={
:if ($ddnsip != $ddnslastip) do={
:log info "DDNS: Sending UPDATE!"
:log info [ :put [/tool dns-update name=$ddnshost address=$ddnsip key-name=$ddnsuser key=$ddnspass ] ]
:global ddnslastip $ddnsip
} else={
:log info "DDNS: No update required."
}
}