ipv6: coturn support

docker-compose.coturn.yml

@@ -4,7 +4,8 @@ services:
     image: instrumentisto/coturn:4.5
     restart: unless-stopped
     command:
-      - "--external-ip=${EXTERNAL_IPv4}"
+      - "--external-ip=${EXTERNAL_IPv4}/${EXTERNAL_IPv4}"
+      - "--external-ip=${EXTERNAL_IPv6:-::1}/${EXTERNAL_IPv6:-::1}"
       - "--static-auth-secret=${TURN_SECRET}"
     volumes:
       - ssl_data:/etc/resty-auto-ssl

mod/coturn/turnserver.conf

@@ -60,4 +60,12 @@ no-tlsv1
 no-tlsv1_1
 
 # To enable single filename logs you need to enable the simple-log flag
-syslog
+syslog
+
+
+# Allocate Address Family according 
+# If enabled then TURN server allocates address family according  the TURN 
+# Client <=> Server communication address family.
+# (By default Coturn works according RFC 6156.)
+# !!Warning: Enabling this option breaks RFC6156 section-4.2 (violates use default IPv4)!!
+keep-address-family