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.

*From: *Dnsmasq-discuss <dnsmasq-discuss- [email protected]> on behalf of Simon Kelley <[email protected]>

*Date: *Thursday, January 22, 2026 at 10:30 AM

*To: *[email protected] <dnsmasq- [email protected]>

*Subject: *Re: [Dnsmasq-discuss] Potential memory leak

 From the mailing list:

"Here's something interesting... it looks like there is a problem with
serving DHCPv6... so after turning on radvd memory consumption started
increasing substantially..."

How does that alter the configuration below?


Simon.

On 22.01.2026 14:05, Niten Jaiswal via Dnsmasq-discuss wrote:
 > I’m running version 2.91_1.1 on opnsense version 25.7.10.  Below is my
 > configuration:
 >
 > OPNsense:~ # cat /usr/local/etc/dnsmasq.conf
 >
 > # DO NOT EDIT THIS FILE -- OPNsense auto-generated file
 >
 > #
 >
 >
 > rebind-localhost-ok
 >
 > stop-dns-rebind
 >
 >
 > port=5353
 >
 >
 > # If you want dnsmasq to listen for DHCP and DNS requests only on
 >
 > # specified interfaces (and the loopback) give the name of the
 >
 > # interface (eg eth0) here.
 >
 > # Repeat the line for more than one interface.
 >
 > interface=ixl1
 >
 >
 >
 >
 > dhcp-fqdn
 >
 > domain=375.jaiswal.net
 >
 > # This tells dnsmasq that a domain is local and it may answer queries
 > from /etc/hosts
 >
 > # or DHCP but should never forward queries on that domain to any
 > upstream servers.
 >
 > local=/375.jaiswal.net/
 >
 >
 > dhcp-authoritative
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 >
 > log-dhcp
 >
 > quiet-dhcp
 >
 > quiet-dhcp6
 >
 > quiet-ra
 >
 > quiet-tftp
 >
 >
 >
 > # host entries flushed via dnsmasq_watcher.py [isc] and a dump of the
 > static reservations
 >
 > addn-hosts=/var/etc/dnsmasq-hosts
 >
 > addn-hosts=/var/etc/dnsmasq-leases
 >
 >
 > dns-forward-max=15000
 >
 > cache-size=10000
 >
 > local-ttl=1
 >
 >
 > conf-dir=/usr/local/etc/dnsmasq.conf.d,*.conf
 >
 >
 > dhcp-range=tag:ixl1,X.X.X.30,X.X.X.199,86400
 >
 >
 > domain=375.jaiswal.net,X.X.X.30,X.X.X.199
 >
 > dhcp-range=tag:ixl1,::1000,::2000,constructor:ixl1,64,86400
 >
 >
 > domain=X.X.X,::1000,::2000
 >
 >
 > dhcp-host=d8:0d:17:41:af:2c,X.X.X.23,TL-SG108PE
 >
 > dhcp-host=68:1d:ef:18:b2:c6,X.X.X.29,camect-home-2fefa
 >
 > dhcp-host=dc:f5:05:18:4e:fb,X.X.X.34,mwmdemo-4EFB
 >
 > dhcp-host=1c:1d:d3:d8:23:e6,X.X.X.35,Nitens-Mac-Studio
 >
 > dhcp-host=a8:51:ab:02:3f:28,X.X.X.99,Guest_Room_AppleTV
 >
 > dhcp-host=00:1a:ae:00:40:4b,X.X.X.101
 >
 > dhcp-host=00:1a:ae:02:5f:16,X.X.X.113
 >
 > dhcp-host=88:c9:e8:bc:e9:50,X.X.X.116,Sony_A95K_FM
 >
 > dhcp-host=60:81:f9:ac:66:58,X.X.X.128,Helium-Hotspot
 >
 > dhcp-host=00:0c:d0:01:23:33,X.X.X.132
 >
 > dhcp-host=b8:2c:a0:5b:5d:14,X.X.X.142,android-a3369b84877d627a
 >
 > dhcp-host=80:a5:89:aa:42:67,X.X.X.152,mwmdemo-4267
 >
 > dhcp-host=90:56:82:98:56:c2,X.X.X.201,AmanBluesound
 >
 > dhcp-host=18:bb:26:e2:2f:43,X.X.X.202,RianBluesound
 >
 > dhcp-host=90:56:82:40:91:49,X.X.X.203,MasterBedroom
 >
 > dhcp-host=64:95:6c:0a:94:76,X.X.X.204,LG_Projector_MB
 >
 > dhcp-host=38:c9:86:14:8b:ae,X.X.X.205,10ddb198e7550000
 >
 > dhcp-host=20:f8:5e:4e:b5:d6,X.X.X.206,RianBedroomFan
 >
 > dhcp-host=20:f8:5e:4e:ac:37,X.X.X.207,AmanBedroomFan
 >
 > dhcp-host=20:f8:5e:35:e4:5c,X.X.X.208,MasterBedroomFa
 >
 > dhcp-host=20:f8:5e:4e:ce:5a,X.X.X.209,FamilyRoomFan
 >
 > dhcp-host=20:f8:5e:e4:44:ce,X.X.X.210,OfficeFan
 >
 > dhcp-host=00:11:d9:56:96:45,X.X.X.211,TIVO-A9200019027F13F
 >
 > dhcp-host=20:f8:5e:4e:ad:57,X.X.X.212,PlayRoomFan
 >
 > dhcp-host=00:1b:7c:09:81:9f,X.X.X.213,sdr35-589374
 >
 > dhcp-host=00:11:d9:8f:15:09,X.X.X.214,TIVO-849601190366E67
 >
 > dhcp-host=14:91:82:d8:4b:70,X.X.X.221,Wemo_soffit
 >
 > dhcp-host=00:1b:7c:09:81:b1,X.X.X.222,sdp55-58b1f0
 >
 > dhcp-host=d4:6a:91:0e:88:d2,X.X.X.223,Wattbox
 >
 > dhcp-host=ec:a9:07:10:7a:50,X.X.X.224,AppleTVvingRoom
 >
 > dhcp-host=4c:ab:4f:90:c6:47,X.X.X.225,AppleTVmilyRoom
 >
 > dhcp-host=c8:d0:83:ca:46:cc,X.X.X.226,MasterBAppleTV3
 >
 > dhcp-host=00:11:d9:96:e8:9a,X.X.X.227,TIVO-84900119048F1A6
 >
 > dhcp-host=id:00:01:00:01:2d:af:54:ce:b8:e6:0c:13:e7:1e,
 > [::b9cc],m1_macbook_pro
 >
 > dhcp-host=id:00:04:bb:36:4d:56:f5:2c:9f:11:50:7a:32:82:60:23:dd:e1,
 > [::bbc1],pi-hole
 >
 > dhcp-host=id:00:01:00:01:29:42:4e:a4:14:98:77:7b:27:6d,[::bbc2],mac-
 > mini-server
 >

> dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98, [::bbc3],aruba-master

 >
 > dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98,[::bbc3],aruba-
 > conductor
 >
 >
 > dhcp-option=tag:ixl1,60,ArubaAP
 >
 > dhcp-option=tag:ixl1,43,X.X.X.2
 >
 > dhcp-option=tag:ixl1,66,X.X.X.10
 >
 > dhcp-option=tag:ixl1,150,X.X.X.10
 >
 > dhcp-option=42,X.X.X.1
 >
 > dhcp-option=tag:ixl1,6,X.X.X.4
 >
 > dhcp-option=tag:ixl1,option6:23,[::bbc1]
 >
 >
 > # default dns mapped to this server (0.0.0.0)
 >
 > dhcp-option=6,0.0.0.0
 >
 >
 >
 > no-ident
 >
 >
 >
 > *From: *Dnsmasq-discuss <dnsmasq-discuss-
 > [email protected]> on behalf of Niten Jaiswal via Dnsmasq-
 > discuss <[email protected]>
 > *Date: *Tuesday, January 20, 2026 at 9:53 PM
 > *To: *[email protected] <dnsmasq-
 > [email protected]>
 > *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 <https:// forum.opnsense.org/index.php?topic=49552.30> <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
 >
 > _______________________________________________
 > Dnsmasq-discuss mailing list
 > [email protected]

> https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq- discuss <https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/ dnsmasq-discuss>

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