Configuring DNS Servers On A FortiGate To Split DNS Traffic Out
FortiGate Split DNS
Use Case: Client has multiple branches that are spread out geographically. These locations utilize a central domain controller for active directory driven resources but need to be able to use local google servers for local domain resolution of content delivery networks, etc. All branches to a headquarters location that is located on the other side of the country (or wide distance from local branch). Local branch does not want users to go across the country for services that are available local.
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I am working on using DNS with Fortigate 6.0.6. I will be upgrading to 6.2.4 next month.
A few questions regarding DNS
Why do you use google DNS servers vs FortiGuard? Don’t you give up some features in using google?
In your posting, “DNS – FortiOS 6.2” you used a Master/Shadow database but in this video you use Slave/Shadow. The application (splitting internal/external DNS requests) appears to be the same in both requirements. Which config is best?
Lastly, I have see local domains appear as “Newly Observed Domain” Category 90. So if using a policy, they will be blocked/redirected. So I created static domain filters to get around it. However, I would expect any “split” DNS requests to bypass the policy. ARG! Even more annoying, I find domain names to be case sensitive. For example, company.local, Company.local, COMPANT.LOCAL, etc. So my static internal domain list is growing. Have you seen this? Do you know of a way to remove case sensitivity, etc.? Seems absolutely stupid to have case sensitivity with DNS.
Hi sir i have a quastion , what the important of primary DNS server 8.8.8.8.? how it is use ?
what is the important of 8.8.8.8 in primary DNS server??? thanks you
Hi, this is completely wrong. You’re configuring the DNS server to be a slave, which requires a zone transfer. That’s not a caching-forwarder, and that’s a particular flavor of split DNS but not what you described at the beginning. If the upstream DNS is not allowing for zone transfers, this doesn’t work. And it’s a very different kind of scenario than what you described.
In IPTables I can capture the DNS requests and re direct it without the user knowledge to the internal DNS servers. How can I achieve that in FG?