Bind9 - cache all forwarded queries for a while

Voltairea

9/11/23, 5:46 PM

My servers was keep asking similar dns queries to 8.8.8.8 and it cost around 30 ms every time. So that I have installed a Bind server and forwarded all dns requests to 8.8.8.8 like this:

zone "." IN {
       type forward;
       forward first;
       forwarders { 8.8.8.8; };
};

Everything works but I have a problem with caching. my aim is caching queries' answer like 1 hours.

desired scenario:

-let's say a server send a dns query for google.com

-my bind server forward it to 8.8.8.8 and returns a response and cache it.

-same server or another server send dns request to google.com in 1 hour.

-this time bind dns server don't forward it to 8.8.8.8, instead , return answer from its own cache. In that way my servers won't lose time to go 8.8.8.8 again and again.

current situation:

-each server gets a response within 30ms on the first query.

-When I send a query again, it returns answers 0 ms. It is probably returning from the local cache on the server.

-but after 1-2 minutes, when I send a query from the same server, the response is still over 30 ms.

-also if I send same dns query(let's say google.com) from 4 different servers in the same seconds, still all servers forwards to 8.8.8.8 and answers come from remote dns servers, not my local cache

0 + 0

linux

bind

dns-server

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Bind9 - cache all forwarded queries for a while

TH: Bind9 - แคชข้อความค้นหาที่ส่งต่อทั้งหมดชั่วขณะหนึ่ง

RO: Bind9 - memorează în cache toate interogările redirecționate pentru o perioadă

RU: Bind9 - кешировать все перенаправленные запросы на некоторое время

VI: Bind9 - lưu trữ tất cả các truy vấn được chuyển tiếp trong một thời gian

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