Reference to a Jitsi troubleshoot with Jitsi behind a NAT

docs/configuring-playbook-dynamic-dns.md

@@ -25,3 +25,8 @@ matrix_dynamic_dns_domain_configurations:
 Additional resources:
 
 - https://matrix.org/docs/guides/free-small-matrix-server
+
+
+## Jitsi behind a NAT
+
+Keep in mind when using dynamic DNS you might run into the problem of having [no video or audio with more than 2 users](https://github.com/EtienneHenger/matrix-docker-ansible-deploy/blob/f2293f61eebe49f47d7bb42363ed4f6b0fa9eb5a/docs/configuring-playbook-jitsi.md#L166).