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DNS in DMZ

Dear All

I have a server farm, in this server farms we have some public servers and some private servers serve the local LAN .

My issue is DNS server,

I want to use Private Vlan ,

the issue is if I use private vlan isolated for DNS server, its not possible, because the DNS needs communicate with other servers.

and If I put the DNS server in community with other public servers, the issue is if DNS server get hacked its very easy to aceess other public servers.

so what is the best solution for this?

thanks

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