Merge pull request #223 from basisbit/patch-4

Double amount of UDP ports that coturn may use

Author: ffdixon

_posts/2019-02-14-setup-turn-server.md

@@ -45,13 +45,13 @@ You need to setup a fully qualified domain name that resolves to the external IP
 
 ## Required Ports
 
-On the coturn server, you need to have the following ports (in addition port 22) available for BigBlueButton clients to connect (port 3478 and 443) and for coturn to connect to your BigBlueButton server (49152 - 65535).
+On the coturn server, you need to have the following ports (in addition port 22) available for BigBlueButton clients to connect (port 3478 and 443) and for coturn to connect to your BigBlueButton server (32768 - 65535).
 
 | Ports       | Protocol | Description           |
 | ----------- | -------- | --------------------- |
 | 3478        | TCP/UDP  | coturn listening port |
 | 443         | TCP/UDP  | TLS listening port    |
-| 49152-65535 | UDP      | relay ports range     |
+| 32768-65535 | UDP      | relay ports range     |
 
 ## Generating TLS certificates
 
@@ -150,6 +150,12 @@ log-file=/var/log/coturn.log
 
 # To enable single filename logs you need to enable the simple-log flag
 simple-log
+
+# Lower and upper bounds of the UDP relay endpoints:
+# (default values are 49152 and 65535)
+#
+min-port=32768
+max-port=65535
 ```
 
 If the TURN server is used by many users concurrently, it might hit the open file-handles limit. Therefore it is recommended to increase this limit by adding `ulimit -n 49152` in `/etc/init.d/coturn` or editing the systemd service specification using `sudo systemctl edit --full coturn` and then adding `LimitNOFILE=49152`. Once this change is applied, restart the coturn service.