EMQ 2.3.4 版本发布，正式支持基于 IPv6 地址集群，支持通过 NGINX/HAProxy 的X-Forwarded-For, X-Forwarded-Port 头获取WebSocket连接原始IP地址。
Bugfix and Enhancements
Feature: Forward real client IP using a reverse proxy for websocket (#1335)
Feature: EMQ node.name with link local ipv6 address not responding to ping (#1460)
Feature: Add PROTO_DIST_ARG flag to support clustering via IPv6 address. (#1460)
Bugfix: retain bit is not set when publishing to clients (when it should be set). (#1461)
Bugfix: Can't search topic on web dashboard (#1473)
emq-sn Bugfix: CONNACK is not always sent to the client (emq-sn#67)
Bugfix: Setting the port to ::1:2000 causes error (emq-sn#66) | 
