I've had good luck with knot-resolver, combined with ExaBGP and a health check script controlling the announcements upstream among other things. Ryan Hamel ________________________________ From: DurgaPrasad - DatasoftComnet via NANOG <nanog@lists.nanog.org> Sent: Thursday, August 7, 2025 5:44 PM To: nanog@lists.nanog.org <nanog@lists.nanog.org> Cc: DurgaPrasad - DatasoftComnet <dp@datasoftcomnet.com> Subject: Recommended DNS server for a medium 20-30k users isp Caution: This is an external email and may be malicious. Please take care when clicking links or opening attachments. Hello all, Do you have any recommendations for recursive DNS servers for a medium sized (20-30k users) ISP. We have used powerdns and unbound but sometimes find the caching times a bit on upper side. Any suggestions between these two or anything new? Also need points on how much we tune the settings pros and cons if any. Thank you /DP _______________________________________________ NANOG mailing list https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.nanog.org%2Farchives%2Flist%2Fnanog%40lists.nanog.org%2Fmessage%2FSUTKDISSISPWQY3YGF25FBQNN2JD5HDP%2F&data=05%7C02%7Cryan%40rkhtech.org%7C887d41a221174314345408ddd614e919%7C81c24bb4f9ec4739ba4d25c42594d996%7C0%7C0%7C638902107516087426%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=zNAPhzQH2Mjon3Cc%2F1GkJDqkug5BjraBHshuP2MNHEs%3D&reserved=0<https://lists.nanog.org/archives/list/nanog@lists.nanog.org/message/SUTKDISSISPWQY3YGF25FBQNN2JD5HDP/>