diff --git a/rootfs/tmp/etc/bind/named.conf b/rootfs/tmp/etc/bind/named.conf
index 65a1c94..ae799d4 100644
--- a/rootfs/tmp/etc/bind/named.conf
+++ b/rootfs/tmp/etc/bind/named.conf
@@ -8,7 +8,7 @@ key "backup-key" { algorithm hmac-sha512; secret "REPLACE_KEY_BACKUP"; };
 #####################################################################
 # access settings
 acl "all" { 0.0.0.0/0; ::/0; };
-acl "secondary" { REPLACE_DNS_SERVER_SECONDARY };
+acl "secondary" { REPLACE_DNS_SERVER_TRANSFER_IP };
 acl "trusted" { 10.0.0.0/8; 127.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16; };
 acl "updates" { key "dhcp-key"; key "certbot."; };
 acl "transfers" {key "dhcp-key"; key "certbot."; key "backup-key"; secondary; };
@@ -27,9 +27,9 @@ options {
   max-ncache-ttl 10800;
   max-udp-size 4096;
   notify yes;
-  also-notify { REPLACE_DNS_SERVER_SECONDARY };
+  also-notify { REPLACE_DNS_SERVER_TRANSFER_IP };
   allow-update { updates; };
-  allow-update-forwarding { REPLACE_DNS_SERVER_SECONDARY };
+  allow-update-forwarding { REPLACE_DNS_SERVER_TRANSFER_IP };
   allow-transfer { trusted; };
   transfer-format many-answers;
   allow-query { any; };
diff --git a/rootfs/usr/local/etc/docker/init.d/02-named.sh b/rootfs/usr/local/etc/docker/init.d/02-named.sh
index 72200f4..3ac14e3 100755
--- a/rootfs/usr/local/etc/docker/init.d/02-named.sh
+++ b/rootfs/usr/local/etc/docker/init.d/02-named.sh
@@ -171,7 +171,8 @@ KEY_CERTBOT="${KEY_CERTBOT:-$(__certbot_key || __tsig_key sha512)}"
 DNS_TYPE="${DNS_TYPE:-primary}"
 DNS_REMOTE_SERVER="${DNS_REMOTE_SERVER:-}"
 DNS_SERVER_PRIMARY="${DNS_SERVER_PRIMARY:-127.0.0.1}"
-DNS_SERVER_SECONDARY="${DNS_SERVER_SECONDARY:-127.0.0.1}"
+DNS_SERVER_SECONDARY="${DNS_SERVER_SECONDARY:-}"
+DNS_SERVER_TRANSFER_IP="${DNS_SERVER_TRANSFER_IP:-}"
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 # Specifiy custom directories to be created
 ADD_APPLICATION_FILES=""
@@ -263,12 +264,12 @@ __update_conf_files() {
     touch "$LOG_DIR/$logfile"
     chmod -Rf 777 "$logfile"
   done
-  if [ -n "$DNS_SERVER_SECONDARY" ]; then
-    for ip in ${DNS_SERVER_SECONDARY//;/ }; do
+  if [ -n "$DNS_SERVER_TRANSFER_IP" ]; then
+    for ip in ${DNS_SERVER_TRANSFER_IP//;/ }; do
       secondary_ip+="$ip; "
     done
+    DNS_SERVER_TRANSFER_IP="$secondary_ip"
   fi
-  DNS_SERVER_SECONDARY="$secondary_ip"
   # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   # replace variables
   __replace "REPLACE_KEY_RNDC" "$KEY_RNDC" "$ETC_DIR/rndc.key"
@@ -278,10 +279,10 @@ __update_conf_files() {
   __replace "REPLACE_KEY_CERTBOT" "$KEY_CERTBOT" "$NAMED_CONFIG_FILE"
   __find_replace "REPLACE_DNS_SERIAL" "$DNS_SERIAL" "$DATA_DIR/primary"
   __find_replace "REPLACE_DNS_SERIAL" "$DNS_SERIAL" "$DATA_DIR/secondary"
-  if [ -n "$DNS_SERVER_SECONDARY" ]; then
-    __replace "REPLACE_DNS_SERVER_SECONDARY" "$DNS_SERVER_SECONDARY" "$NAMED_CONFIG_FILE"
+  if [ -n "$DNS_SERVER_TRANSFER_IP" ]; then
+    __replace "REPLACE_DNS_SERVER_TRANSFER_IP" "$DNS_SERVER_TRANSFER_IP" "$NAMED_CONFIG_FILE"
   else
-    sed -i '/REPLACE_DNS_SERVER_SECONDARY/d' "$NAMED_CONFIG_FILE"
+    sed -i '/REPLACE_DNS_SERVER_TRANSFER_IP/d' "$NAMED_CONFIG_FILE"
   fi
   # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   # define actions