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I’m running version 2.91_1.1 on opnsense version 25.7.10. Below is my configuration:</div>
<p style="direction: ltr; line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">OPNsense:~ # cat /usr/local/etc/dnsmasq.conf</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># DO NOT EDIT THIS FILE -- OPNsense auto-generated file</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">#</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">rebind-localhost-ok</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">stop-dns-rebind</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">port=5353</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># If you want dnsmasq to listen for DHCP and DNS requests only on</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># specified interfaces (and the loopback) give the name of the</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># interface (eg eth0) here.</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># Repeat the line for more than one interface.</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">interface=ixl1</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-fqdn</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">domain=375.jaiswal.net</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># This tells dnsmasq that a domain is local and it may answer queries from /etc/hosts</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># or DHCP but should never forward queries on that domain to any upstream servers.</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">local=/375.jaiswal.net/</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-authoritative</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
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<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">log-dhcp</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">quiet-dhcp</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">quiet-dhcp6</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">quiet-ra</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">quiet-tftp</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># host entries flushed via dnsmasq_watcher.py [isc] and a dump of the static reservations</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">addn-hosts=/var/etc/dnsmasq-hosts</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">addn-hosts=/var/etc/dnsmasq-leases</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dns-forward-max=15000</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">cache-size=10000</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">local-ttl=1</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">conf-dir=/usr/local/etc/dnsmasq.conf.d,*.conf</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-range=tag:ixl1,X.X.X.30,X.X.X.199,86400</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">domain=375.jaiswal.net,X.X.X.30,X.X.X.199</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-range=tag:ixl1,::1000,::2000,constructor:ixl1,64,86400</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">domain=X.X.X,::1000,::2000</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=d8:0d:17:41:af:2c,X.X.X.23,TL-SG108PE</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=68:1d:ef:18:b2:c6,X.X.X.29,camect-home-2fefa</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=dc:f5:05:18:4e:fb,X.X.X.34,mwmdemo-4EFB</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=1c:1d:d3:d8:23:e6,X.X.X.35,Nitens-Mac-Studio</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=a8:51:ab:02:3f:28,X.X.X.99,Guest_Room_AppleTV</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:1a:ae:00:40:4b,X.X.X.101</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:1a:ae:02:5f:16,X.X.X.113</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=88:c9:e8:bc:e9:50,X.X.X.116,Sony_A95K_FM</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=60:81:f9:ac:66:58,X.X.X.128,Helium-Hotspot</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:0c:d0:01:23:33,X.X.X.132</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=b8:2c:a0:5b:5d:14,X.X.X.142,android-a3369b84877d627a</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=80:a5:89:aa:42:67,X.X.X.152,mwmdemo-4267</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=90:56:82:98:56:c2,X.X.X.201,AmanBluesound</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=18:bb:26:e2:2f:43,X.X.X.202,RianBluesound</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=90:56:82:40:91:49,X.X.X.203,MasterBedroom</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=64:95:6c:0a:94:76,X.X.X.204,LG_Projector_MB</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=38:c9:86:14:8b:ae,X.X.X.205,10ddb198e7550000</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:4e:b5:d6,X.X.X.206,RianBedroomFan</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:4e:ac:37,X.X.X.207,AmanBedroomFan</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:35:e4:5c,X.X.X.208,MasterBedroomFa</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:4e:ce:5a,X.X.X.209,FamilyRoomFan</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:e4:44:ce,X.X.X.210,OfficeFan</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:11:d9:56:96:45,X.X.X.211,TIVO-A9200019027F13F</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=20:f8:5e:4e:ad:57,X.X.X.212,PlayRoomFan</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:1b:7c:09:81:9f,X.X.X.213,sdr35-589374</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:11:d9:8f:15:09,X.X.X.214,TIVO-849601190366E67</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=14:91:82:d8:4b:70,X.X.X.221,Wemo_soffit</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:1b:7c:09:81:b1,X.X.X.222,sdp55-58b1f0</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=d4:6a:91:0e:88:d2,X.X.X.223,Wattbox</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=ec:a9:07:10:7a:50,X.X.X.224,AppleTVvingRoom</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=4c:ab:4f:90:c6:47,X.X.X.225,AppleTVmilyRoom</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=c8:d0:83:ca:46:cc,X.X.X.226,MasterBAppleTV3</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=00:11:d9:96:e8:9a,X.X.X.227,TIVO-84900119048F1A6</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=id:00:01:00:01:2d:af:54:ce:b8:e6:0c:13:e7:1e,[::b9cc],m1_macbook_pro</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=id:00:04:bb:36:4d:56:f5:2c:9f:11:50:7a:32:82:60:23:dd:e1,[::bbc1],pi-hole</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=id:00:01:00:01:29:42:4e:a4:14:98:77:7b:27:6d,[::bbc2],mac-mini-server</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98,[::bbc3],aruba-master</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-host=id:00:01:00:01:2e:ea:7c:b5:00:1a:1e:04:13:98,[::bbc3],aruba-conductor</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,60,ArubaAP</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,43,X.X.X.2</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,66,X.X.X.10</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,150,X.X.X.10</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=42,X.X.X.1</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,6,X.X.X.4</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=tag:ixl1,option6:23,[::bbc1]</span></p>
<p style="line-height: normal; margin: 0px; min-height: 14px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);"># default dns mapped to this server (0.0.0.0)</span></p>
<p style="line-height: normal; margin: 0px;"><span style="font-family: Helvetica; font-size: 12px; color: rgb(0, 0, 0);">dhcp-option=6,0.0.0.0</span></p>
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<b>From: </b>Dnsmasq-discuss <dnsmasq-discuss-bounces@lists.thekelleys.org.uk> on behalf of Niten Jaiswal via Dnsmasq-discuss <dnsmasq-discuss@lists.thekelleys.org.uk><br>
<b>Date: </b>Tuesday, January 20, 2026 at 9:53 PM<br>
<b>To: </b>dnsmasq-discuss@lists.thekelleys.org.uk <dnsmasq-discuss@lists.thekelleys.org.uk><br>
<b>Subject: </b>[Dnsmasq-discuss] Potential memory leak<br>
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Hi!</div>
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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:</div>
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<a href="https://forum.opnsense.org/index.php?topic=49552.30" data-outlook-id="4086ce43-e834-4fc5-850e-16a501ec39fb">https://forum.opnsense.org/index.php?topic=49552.30</a></div>
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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.. </div>
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Let me know if you need additional information. I was asked to post to the email list by an opnsense forum moderator.</div>
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TIA</div>
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Niten</div>
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