help me

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Dier sir,
i have aproblem in my DNS.
my domain controler contain two NIC one for entier network and the other
have the real IP and having virtual connection if i want to connect to the
internet from the entire network the browsing is very bad and the connection
always down but when connect from the DC itself the browsing is good, i donot
know the cause,
please help me
thank you for your time

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