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Hoje finalmente consegui fazer funcionar a página de manutenção do MK-AUTH para entrar automáticamente quando o link de internet cair e sair quando o link voltar novamente, mastigadinho segue as regras, atenção somente para onde está "10.0.0.0/8" coloque a faixa de ip da network de saída para os clientes e onde está "EthLink" é o nome da interface de entrada do link de internet.

/ip firewall nat
add action=dst-nat chain=dstnat disabled=no dst-port=80 in-interface=EthLink \
    protocol=tcp to-addresses=172.31.255.2 to-ports=80
add action=dst-nat chain=dstnat comment="manuten\E7\E3o" disabled=yes \
    dst-port=80 protocol=tcp src-address=0.0.0.0/0 src-address-list=\
    "!Manuten\E7\E3o" to-addresses=172.31.255.2 to-ports=89

/ip firewall address-list
add address=10.0.0.0/8 comment="MANUTEN\C7\C3O" disabled=no list="manuten\E7\E3o"

/system script
policy=ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive,api source="ip firewall nat set [find comment=manuten\E7\E3o] disabled=no"
add name=link-up policy=ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive,api source="ip firewall nat set [find comment=manuten\E7\E3o] disabled=yes"

/ip hotspot walled-garden
add action=allow disabled=no dst-host=172.31.255.2 dst-port=80-90

/tool netwatch
add disabled=no down-script="/ip firewall nat set [find comment=\"manuten\E7\E3o\"] disabled=no" host=200.154.56.80 \
    interval=5s timeout=1s up-script="/ip firewall nat set [find comment=\"manuten\E7\E3o\"] disabled=yes"