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Domain Name System Security Extensions (DNSSEC) is a vital series of extensions designed to enhance the security of the DNS protocol. By employing cryptographic signatures, DNSSEC validates DNS responses, safeguarding against threats like DNS spoofing and cache tampering. In this guide, we will delve into the steps required to configure DNSSEC on a Windows Server, along with DNS Socket Pool and DNS Cache Locking for improved security.
To initiate DNSSEC configuration, follow these steps:
After this, verify by navigating to Trust Point > ae > domain name in DNS Manager.
Once the zone is configured, use the Group Policy Management utility to implement necessary domain policy alterations:
Enhancing DNS security further, the DNS Socket Pool should be configured to randomize source ports for outgoing queries. To adjust the socket pool size, run PowerShell as an administrator and execute:
Get-DNSServer
or
Get-DnsServerSetting -All | Select-Object -Property SocketPoolSize
To increase the socket pool size, use:
dnscmd /config /socketpoolsize 5000
Note: The value must be between 0 and 10,000. After this, restart your DNS Server.
To protect cached DNS records from being overwritten during their TTL, DNS Cache Locking needs to be configured. Check the current locking percentage using:
Get-DnsServerCache | Select-Object -Property LockingPercent
If it’s not at 100%, set it by running:
Set-DnsServerCache –LockingPercent 100
By applying these configurations, your DNS security on Windows Server will be significantly enhanced.
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