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The configuration below has dnsmasq’s RA feature turned off. If I turn off radvd and turn on dnsmasq’s RA feature the same behavior occurs. </div>
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<b>From: </b>Dnsmasq-discuss <dnsmasq-discuss-bounces@lists.thekelleys.org.uk> on behalf of Simon Kelley <simon@thekelleys.org.uk><br>
<b>Date: </b>Thursday, January 22, 2026 at 10:30 AM<br>
<b>To: </b>dnsmasq-discuss@lists.thekelleys.org.uk <dnsmasq-discuss@lists.thekelleys.org.uk><br>
<b>Subject: </b>Re: [Dnsmasq-discuss] Potential memory leak<br>
<br>
</div>
<div class="PlainText" style="font-size: 11pt;">From the mailing list:<br>
<br>
"Here's something interesting... it looks like there is a problem with<br>
serving DHCPv6... so after turning on radvd memory consumption started<br>
increasing substantially..."<br>
<br>
How does that alter the configuration below?<br>
<br>
<br>
Simon.<br>
<br>
On 22.01.2026 14:05, Niten Jaiswal via Dnsmasq-discuss wrote:<br>
> I’m running version 2.91_1.1 on opnsense version 25.7.10. Below is my<br>
> configuration:<br>
><br>
> OPNsense:~ # cat /usr/local/etc/dnsmasq.conf<br>
><br>
> # DO NOT EDIT THIS FILE -- OPNsense auto-generated file<br>
><br>
> #<br>
><br>
><br>
> rebind-localhost-ok<br>
><br>
> stop-dns-rebind<br>
><br>
><br>
> port=5353<br>
><br>
><br>
> # If you want dnsmasq to listen for DHCP and DNS requests only on<br>
><br>
> # specified interfaces (and the loopback) give the name of the<br>
><br>
> # interface (eg eth0) here.<br>
><br>
> # Repeat the line for more than one interface.<br>
><br>
> interface=ixl1<br>
><br>
><br>
><br>
><br>
> dhcp-fqdn<br>
><br>
> domain=375.jaiswal.net<br>
><br>
> # This tells dnsmasq that a domain is local and it may answer queries<br>
> from /etc/hosts<br>
><br>
> # or DHCP but should never forward queries on that domain to any<br>
> upstream servers.<br>
><br>
> local=/375.jaiswal.net/<br>
><br>
><br>
> dhcp-authoritative<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> log-dhcp<br>
><br>
> quiet-dhcp<br>
><br>
> quiet-dhcp6<br>
><br>
> quiet-ra<br>
><br>
> quiet-tftp<br>
><br>
><br>
><br>
> # host entries flushed via dnsmasq_watcher.py [isc] and a dump of the<br>
> static reservations<br>
><br>
> addn-hosts=/var/etc/dnsmasq-hosts<br>
><br>
> addn-hosts=/var/etc/dnsmasq-leases<br>
><br>
><br>
> dns-forward-max=15000<br>
><br>
> cache-size=10000<br>
><br>
> local-ttl=1<br>
><br>
><br>
> conf-dir=/usr/local/etc/dnsmasq.conf.d,*.conf<br>
><br>
><br>
> dhcp-range=tag:ixl1,X.X.X.30,X.X.X.199,86400<br>
><br>
><br>
> domain=375.jaiswal.net,X.X.X.30,X.X.X.199<br>
><br>
> dhcp-range=tag:ixl1,::1000,::2000,constructor:ixl1,64,86400<br>
><br>
><br>
> domain=X.X.X,::1000,::2000<br>
><br>
><br>
> dhcp-host=d8:0d:17:41:af:2c,X.X.X.23,TL-SG108PE<br>
><br>
> dhcp-host=68:1d:ef:18:b2:c6,X.X.X.29,camect-home-2fefa<br>
><br>
> dhcp-host=dc:f5:05:18:4e:fb,X.X.X.34,mwmdemo-4EFB<br>
><br>
> dhcp-host=1c:1d:d3:d8:23:e6,X.X.X.35,Nitens-Mac-Studio<br>
><br>
> dhcp-host=a8:51:ab:02:3f:28,X.X.X.99,Guest_Room_AppleTV<br>
><br>
> dhcp-host=00:1a:ae:00:40:4b,X.X.X.101<br>
><br>
> dhcp-host=00:1a:ae:02:5f:16,X.X.X.113<br>
><br>
> dhcp-host=88:c9:e8:bc:e9:50,X.X.X.116,Sony_A95K_FM<br>
><br>
> dhcp-host=60:81:f9:ac:66:58,X.X.X.128,Helium-Hotspot<br>
><br>
> dhcp-host=00:0c:d0:01:23:33,X.X.X.132<br>
><br>
> dhcp-host=b8:2c:a0:5b:5d:14,X.X.X.142,android-a3369b84877d627a<br>
><br>
> dhcp-host=80:a5:89:aa:42:67,X.X.X.152,mwmdemo-4267<br>
><br>
> dhcp-host=90:56:82:98:56:c2,X.X.X.201,AmanBluesound<br>
><br>
> dhcp-host=18:bb:26:e2:2f:43,X.X.X.202,RianBluesound<br>
><br>
> dhcp-host=90:56:82:40:91:49,X.X.X.203,MasterBedroom<br>
><br>
> dhcp-host=64:95:6c:0a:94:76,X.X.X.204,LG_Projector_MB<br>
><br>
> dhcp-host=38:c9:86:14:8b:ae,X.X.X.205,10ddb198e7550000<br>
><br>
> dhcp-host=20:f8:5e:4e:b5:d6,X.X.X.206,RianBedroomFan<br>
><br>
> dhcp-host=20:f8:5e:4e:ac:37,X.X.X.207,AmanBedroomFan<br>
><br>
> dhcp-host=20:f8:5e:35:e4:5c,X.X.X.208,MasterBedroomFa<br>
><br>
> dhcp-host=20:f8:5e:4e:ce:5a,X.X.X.209,FamilyRoomFan<br>
><br>
> dhcp-host=20:f8:5e:e4:44:ce,X.X.X.210,OfficeFan<br>
><br>
> dhcp-host=00:11:d9:56:96:45,X.X.X.211,TIVO-A9200019027F13F<br>
><br>
> dhcp-host=20:f8:5e:4e:ad:57,X.X.X.212,PlayRoomFan<br>
><br>
> dhcp-host=00:1b:7c:09:81:9f,X.X.X.213,sdr35-589374<br>
><br>
> dhcp-host=00:11:d9:8f:15:09,X.X.X.214,TIVO-849601190366E67<br>
><br>
> dhcp-host=14:91:82:d8:4b:70,X.X.X.221,Wemo_soffit<br>
><br>
> dhcp-host=00:1b:7c:09:81:b1,X.X.X.222,sdp55-58b1f0<br>
><br>
> dhcp-host=d4:6a:91:0e:88:d2,X.X.X.223,Wattbox<br>
><br>
> dhcp-host=ec:a9:07:10:7a:50,X.X.X.224,AppleTVvingRoom<br>
><br>
> dhcp-host=4c:ab:4f:90:c6:47,X.X.X.225,AppleTVmilyRoom<br>
><br>
> dhcp-host=c8:d0:83:ca:46:cc,X.X.X.226,MasterBAppleTV3<br>
><br>
> dhcp-host=00:11:d9:96:e8:9a,X.X.X.227,TIVO-84900119048F1A6<br>
><br>
> dhcp-host=id:00:01:00:01:2d:af:54:ce:b8:e6:0c:13:e7:1e,<br>
> [::b9cc],m1_macbook_pro<br>
><br>
> dhcp-host=id:00:04:bb:36:4d:56:f5:2c:9f:11:50:7a:32:82:60:23:dd:e1,<br>
> [::bbc1],pi-hole<br>
><br>
> dhcp-host=id:00:01:00:01:29:42:4e:a4:14:98:77:7b:27:6d,[::bbc2],mac-<br>
> mini-server<br>
><br>
> dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98,[::bbc3],aruba-master<br>
><br>
> dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98,[::bbc3],aruba-<br>
> conductor<br>
><br>
><br>
> dhcp-option=tag:ixl1,60,ArubaAP<br>
><br>
> dhcp-option=tag:ixl1,43,X.X.X.2<br>
><br>
> dhcp-option=tag:ixl1,66,X.X.X.10<br>
><br>
> dhcp-option=tag:ixl1,150,X.X.X.10<br>
><br>
> dhcp-option=42,X.X.X.1<br>
><br>
> dhcp-option=tag:ixl1,6,X.X.X.4<br>
><br>
> dhcp-option=tag:ixl1,option6:23,[::bbc1]<br>
><br>
><br>
> # default dns mapped to this server (0.0.0.0)<br>
><br>
> dhcp-option=6,0.0.0.0<br>
><br>
><br>
><br>
> no-ident<br>
><br>
><br>
><br>
> *From: *Dnsmasq-discuss <dnsmasq-discuss-<br>
> bounces@lists.thekelleys.org.uk> on behalf of Niten Jaiswal via Dnsmasq-<br>
> discuss <dnsmasq-discuss@lists.thekelleys.org.uk><br>
> *Date: *Tuesday, January 20, 2026 at 9:53 PM<br>
> *To: *dnsmasq-discuss@lists.thekelleys.org.uk <dnsmasq-<br>
> discuss@lists.thekelleys.org.uk><br>
> *Subject: *[Dnsmasq-discuss] Potential memory leak<br>
><br>
> Hi!<br>
> I’m a user of opnsense and have migrated to dnsmasq for DHCPv4 and v6<br>
> services. However, dnsmasq randomly stops functioning and I need to<br>
> manually restart it to restore DHCP services to my network. I’ve been<br>
> troubleshooting the issue on the opnsense form on the following thread:<br>
> <a href="https://forum.opnsense.org/index.php?topic=49552.30" data-outlook-id="0eabd240-79b8-42eb-a626-38fbed7dd9e6">
https://forum.opnsense.org/index.php?topic=49552.30</a> <https://<br>
> forum.opnsense.org/index.php?topic=49552.30><br>
><br>
> My basic testing points to an issue with serving DHCPv6 addresses. When<br>
> I have router advertisement set to unmanaged the memory consumption of<br>
> dnsmasq was fairly stable. When router advertisement is set to managed<br>
> then dnsmasq begins consuming more and more memory..<br>
><br>
> Let me know if you need additional information. I was asked to post to<br>
> the email list by an opnsense forum moderator.<br>
><br>
> TIA<br>
> Niten<br>
><br>
> _______________________________________________<br>
> Dnsmasq-discuss mailing list<br>
> Dnsmasq-discuss@lists.thekelleys.org.uk<br>
> <a href="https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss" data-outlook-id="b7ba833c-b72c-4ed6-b485-2cb09b855694">
https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss</a><br>
<br>
<br>
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