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a DNS issue??

Anonymous
2025-01-15T10:51:39+00:00

hello,

I have an issue with forms.office.com, it's not loading all its content.

We have two dns server in the head office, a primary (192.168.0.5) and an alternative (192.168.0.6). everything works fine in the HO with the users, also in each branch we have a dns server (192.168.x.x) and the alternative is (192.168.0.5) and the link above works fine.

we faces issue in the small branches where there is no a dhcp server nor a dns server. we configure a dhcp server on a master aruba ap and we set the dns server as follow (192.168.0.5) on the aruba ap.
the forms.office.com, does not fully load, unless I set a static primary dns server ip : 8.8.8.8 on each pc and an alternative ip:192.168.0.5, if i set google's dns server as an alternative the page won't load.

note that all branches are connected to the head office and passthrough the firewall to go public.

Any help?

Thank you.

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  1. Anonymous
    2025-01-16T05:53:00+00:00

    Hello,

    Thank you for reaching out.

    The issue might be related to DNS configuration, especially in small branches without a dedicated DNS server. Here are the steps to resolve it:

    1. Check DNS Forwarder Settings: Ensure the head office DNS server (192.168.0.5) forwards unresolved requests to a reliable external DNS, such as 8.8.8.8 or 1.1.1.1.
    2. Test DNS Resolution in Branches: Use nslookup on a branch device to test how forms.office.com is being resolved. Test with both 192.168.0.5 and 8.8.8.8 to compare the results and identify any discrepancies.
    3. Inspect Firewall Rules: Verify that the firewall allows DNS traffic (UDP/TCP on port 53) from 192.168.0.5 to external DNS servers. Ensure there are no rules blocking or filtering forms.office.com.
    4. Set Up Split DNS: Configure conditional forwarders in the DNS server for office.com to direct queries to external DNS (e.g., 8.8.8.8).
    5. Optimize DHCP Configuration: On the Aruba DHCP, set the primary DNS to 192.168.0.5 and the secondary DNS to 8.8.8.8 to ensure reliable resolution for both local and external domains.

    These steps should resolve the issue with forms.office.com not fully loading. If the problem persists, further investigation of the head office DNS logs and branch network configurations may be needed.

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