Our company is a remote healthcare provider with remote clinics that only staff 1-5 people per site. Each site has an x300 Barracuda firewall with a site-to-site VPN tunnel to our data center where our corporate servers reside. We have just set up 2 Active Directory domain controllers in our data center and would like the Barracuda Firewall at each site to configure DHCP clients to use 3 DNS servers - our 2 Active Directory domain controllers that are also the DNS servers for our internal zone, and a public DNS server so the clinics can resolve names when the VPN tunnel is not available. The Barracuda Firewall only allows 2 DNS entries in the DHCP configuration, even though there is no technical reason why DHCP Option #6 can't be used with more than 2 entries.
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