[Dnsmasq-discuss] Potential memory leak

[Donald Muller]

The people that know about dnsmasq are going to need to know what version you are running and what your config looks like.
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From: Dnsmasq-discuss <dnsmasq-discuss-bounces at lists.thekelleys.org.uk> on behalf of Niten Jaiswal via Dnsmasq-discuss <dnsmasq-discuss at lists.thekelleys.org.uk>
Sent: Tuesday, January 20, 2026 9:32 PM
To: dnsmasq-discuss at lists.thekelleys.org.uk <dnsmasq-discuss at lists.thekelleys.org.uk>
Subject: [Dnsmasq-discuss] Potential memory leak

Hi!
I’m a user of opnsense and have migrated to dnsmasq for DHCPv4 and v6 services.  However, dnsmasq randomly stops functioning and I need to manually restart it to restore DHCP services to my network.  I’ve been troubleshooting the issue on the opnsense form on the following thread:
https://forum.opnsense.org/index.php?topic=49552.30

My basic testing points to an issue with serving DHCPv6 addresses.  When I have router advertisement set to unmanaged the memory consumption of dnsmasq was fairly stable.  When router advertisement is set to managed then dnsmasq begins consuming more and more memory..

Let me know if you need additional information.  I was asked to post to the email list by an opnsense forum moderator.

TIA
Niten
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