---
title: VPN Tunneling Multicast Support
slug: ps/help/en_us/ics/com/vtcg/vpn-tunneling-multicast-support
docTags: 
createdAt: 2026-08-02T15:43:23.581Z
---

To enable streaming IP video broadcasts over the internal network, VPN tunneling features **Internet Group Management Protocol (IGMP)** gateway multicast proxy support.

:::hint{type="info"}
VPN tunneling does not support **IGMP v2**. If you are using VPN tunneling multicast support, and you are using L2 switches, make sure the switches support **IGMP v3**.
:::

When users initiate a request to join a multicast group, the system initiates an `IGMP join` message to the local multicast router or switch on the client's behalf. In addition, the system stores the IGMP group request queries in its cache so that whenever a multicast router in the network polls the system for IGMP group information, it responds with its current collection of multicast user and group requests. If a router or switch does not receive a response from the system, the system's multicast group information is removed from the router or switch's forwarding table.

:::hint{type="info"}
VPN tunneling supports streaming media at up to 2 mbps on a single tunnel (megabits per second).
:::