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Routing inside ISA network


I want to add a new subnet to our internal network.  I have an ISA firewall in front of all.  I installed a linksys inside the ISA network.
The topology is the following : Internet - ISA - linksys

Computer behind linksys are able to ping computer behind ISA with the IP but NOT with the DNS names.
Computer behind linksys are able to go on the internet since ISA is forwarding them correctly to the external DNS.

In ISA, i added the new subnet network addresses to the Internal Network.  Is there something else i should configure?

Microsoft Forefront ISA ServerNetworkingRouters

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8/22/2022 - Mon