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:local piholedown [/ip firewall nat get ([find where comment="PiHole-DNS"]->0) disabled] 
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:local piholeDNS "10.0.0.1"
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:local testDomain "www.google.com"
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:local token "XXXXXXXXXXXXXXXXXX"
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:local chatid "YYYYYYY"
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:if ($piholedown = false) do={
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    :do {
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        :resolve domain-name="$testDomain" server="$piholeDNS"
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    } on-error={
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        /ip firewall nat
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            disable [find comment="PiHole-DNS"]
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            enable [find comment="Google-DNS"]
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        :delay 2000ms
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        /tool fetch "https://api.telegram.org/bot$token/sendmessage\?chat_id=$chatid&text=Pi-Hole not working! Changed DNS to GoogleDNS." keep-result=no
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    }
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} else={
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    :do {
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        :resolve domain-name="$testDomain" server="$piholeDNS"
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        /ip firewall nat
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            enable [find comment="PiHole-DNS"]
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            disable [find comment="Google-DNS"]
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        :delay 2000ms
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        /tool fetch "https://api.telegram.org/bot$token/sendmessage\?chat_id=$chatid&text=Pi-Hole working! Changed DNS." keep-result=no
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    } on-error={}
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}