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How do I test if Firewall is blocking DNS forwarding?
I'm setting up a network for about 50 users. I configured a domain controller and DNS on the same server. I have successfully joined my computer on the new domain but I am having trouble accessing most domains on the internet. Our company domain website is hosted externally and I have an A record in the forward look up zone on our DNS server, so it find it and it works just fine. I can also get to speedtest.org, but nothing else.
Locally, I have set my IP and DNS setting manually to internal DNS server and firewall. On the DNS server, I set the IP address to 127.0.0.1 and checked the DNS forwarders and everything appears to be set correctly according to the many articles and forums I have checked.
I also tested by manually setting my local DNS server to external DNS servers, like Comcast, but I get the same results. I'm starting to think that the firewall is blocking this traffic. Is there a way to test this?
- PR
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Hi Paul
If you find nothing in the log, you can use
- packet captures, on WAN interface, with a filter on forwarders.
Do you see outgoing DNS requests ? and incoming responses ? - diagnose debug flow with filter.
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Check the Fortigate logs, if anything is blocked it should be displayed there.
You can also do a debug.
Rony Moussa
NSE Certified : Level 8
Fortinet NSE Certified: Level 8
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Hi Paul
If you find nothing in the log, you can use
- packet captures, on WAN interface, with a filter on forwarders.
Do you see outgoing DNS requests ? and incoming responses ? - diagnose debug flow with filter.
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