From c5de4f9e42fcb1d3ee8052a249f7e376fe78420f Mon Sep 17 00:00:00 2001
From: Florian Loeffler <loe.florian@gmail.com>
Date: Wed, 3 Feb 2021 13:59:18 +0100
Subject: [PATCH] adds config option for external nameserver

---
 ddns.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ddns.sh b/ddns.sh
index 2a322f7..5a72849 100755
--- a/ddns.sh
+++ b/ddns.sh
@@ -1,5 +1,12 @@
 #!/bin/bash
 
+# The DNS-server IP to use for checking the domain->IP mapping
+# If the local system has it's own DNS server which maps IPs differently
+# this should point to an external DNS like 1.1.1.1
+NAMESERVER="1.1.1.1"
+
+# ----- END CONFIG -------------------------------
+
 SCRIPTPATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 
 DOMAIN="$1"
@@ -20,7 +27,7 @@ if [[ "${PROBE_DOMAIN}" == \*.* ]]; then
     PROBE_DOMAIN="probe.${PROBE_DOMAIN:2}"
     echo "Probe domain is ----------> ${PROBE_DOMAIN}"
 fi
-DNS_IP=$(dig +short ${PROBE_DOMAIN})
+DNS_IP=$(dig @${NAMESERVER} +short ${PROBE_DOMAIN})
 echo "Current DNS-IP -----------> ${DNS_IP}"