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My system configuration:
- Linux ver : 2.6.11.7 embedded linux
When target system dns query to server and receive effective ip address including ttl.
But next query about after 5 min. resolver lookup again even if the TTL did not expired yet.
Where can I find the source code and fix this problem ?
I think that you need to install a DNS caching mechanism on your client such as dnsmasq or a full DNS server such as bind that takes the TTL into account. A resolver doesn't do that.
I use dnsmasq for what you describe and it works well.
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DNS lookup again before expiring TTL
