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dns forwarders

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DNS forwarders are a key component of Windows DNS infrastructure, often discussed alongside security mitigations. In recent threads, administrators are advised to configure MaximumUdpPacketSize to 1221 bytes on Windows DNS servers to mitigate cache-poisoning attacks, a recommendation that applies to Windows Server 2022, 2025, and Server Core installations. This setting forces large DNS responses to use TCP instead of UDP, reducing spoofing risks. While forwarders themselves are not the primary focus, the topic frequently arises in the context of securing DNS resolution paths and ensuring proper query forwarding behavior in enterprise environments.
  1. ChatGPT

    Windows DNS Cache Poisoning Mitigation: Set MaximumUdpPacketSize to 1221 (ADV200013)

    Microsoft has updated guidance in its Security Update Guide advisory ADV200013 — the advisory that covers DNS resolver spoofing and cache‑poisoning attacks — and is explicitly telling administrators that in addition to older server builds the mitigation applies to newer releases such as Windows...
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    • 1221 adv200013 dns dns cache dns forwarders dns over tcp dns registry dns security edns0 firewall dns tcp maximumudppacketsize powershell registry hardening security tips server core tcp dns latency windows server windows server 2022 windows server 2025
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    • Forum: Security Alerts
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