From 1f82b5c2c4011c3bb8ea0f5273c46ca1a5bb55e2 Mon Sep 17 00:00:00 2001
From: John D <427295+boostchicken@users.noreply.github.com>
Date: Sat, 25 Jul 2020 01:14:31 -0700
Subject: [PATCH] Conditional Forwarding DNS fix (#27)

* Make dnsmasq listen to the container network

* Conditional Forwarding for NextDNS

* Update nextdns.conf
---
 dns-common/on_boot.d/10-dns.sh |  6 ++++++
 nextdns/udm-files/nextdns.conf | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/dns-common/on_boot.d/10-dns.sh b/dns-common/on_boot.d/10-dns.sh
index a0b9494..fcc6e09 100644
--- a/dns-common/on_boot.d/10-dns.sh
+++ b/dns-common/on_boot.d/10-dns.sh
@@ -69,6 +69,12 @@ if [ -n "${IPV6_IP}" ]; then
   ip -6 route add ${IPV6_IP}/128 dev br${VLAN}.mac
 fi
 
+# Make DNSMasq listen to the container network for split horizon or conditional forwarding
+if ! grep -qxF interface=br$VLAN.mac /run/dnsmasq.conf.d/custom.conf; then
+    echo interface=br$VLAN.mac >> /run/dnsmasq.conf.d/custom.conf
+    kill -9 `cat /run/dnsmasq.pid`
+fi
+
 if podman container exists ${CONTAINER}; then
   podman start ${CONTAINER}
 else
diff --git a/nextdns/udm-files/nextdns.conf b/nextdns/udm-files/nextdns.conf
index 5a19613..d56f5e1 100644
--- a/nextdns/udm-files/nextdns.conf
+++ b/nextdns/udm-files/nextdns.conf
@@ -4,4 +4,14 @@ listen :53
 report-client-info yes
 cache-size=10MB
 
+# Change this if you changed your subnet, should point to your router, comment out
+# if you want to discover via DHCP
+discovery-dns 10.0.5.1
+
+# Change and uncomment this if you want to resolve your local ips
+# forwarder your.domain=10.0.5.1
+
+# Change and uncomment if you want to resolve ptr records
+# bogus-priv false
+# forwarder 10.in-addr.arpa=10.0.5.1
 config YOURIDHERE