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Win2008 R2 DHCP and ASG DNS Proxy

Hi,

i searched this forum and found a "DNS Proxy best practise" here:

https://community.sophos.com/products/unified-threat-management/astaroorg/f/53/t/32566

After reading the mentioned thread i changed our internal DNS server config and the ASG 220 8.203. 

Finally i tried to modify the Win2008R2 DHCP server options accordingly (option 006 DNS Server set to internalDNS1, internalDNS2 and ASG). The first two were no problem at all but the ASG was not accepted (DHCP Server tests the ASG whether it is a valid DNS Server or not-> Result: the ip address is invalid).

Here's the question:

Is it possible to configure the ASG internal ip address as DNS Server within Win2008R2 DHCP server options for the DHCP Clients to have a fallback DNS Server in case the internal DNS servers fail?

Thanks,
Martin


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