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When you are enabling clients to pull a stream from the encoder, you can allow or deny access to the broadcast based on a static IP address or groups of IP addresses. By default, no clients are restricted from connecting to the broadcast. If you want to specify the clients that can connect, you can add the IP addresses to the allow list. Doing so prevents any unlisted clients from connecting. Or, if you want to prevent a specific client from accessing the broadcast, you can add that client's IP address to the deny list
If you make changes to the IP address list while encoding, your changes take effect only for clients that connect after you apply your changes. For example, if you add an IP address to the deny list while that client is connected, the client is not disconnected. However, if the client disconnects and then attempts to reconnect to the same broadcast, it is denied. If it is critical to disconnect a client immediately, you can stop encoding.
The following table provides an example of the order in which IP addresses are allowed or denied, depending on the restrictions that you set up.
| Allow list | Deny list | Result |
| Empty | Empty | Allow all IP addresses |
| Empty | IP address 1 | Deny IP address 1, allow all others |
| IP address 1 | Empty | Allow IP address 1, deny all others |
| IP address 1 | IP address 2 | Allow IP address 1, deny all others |
| IP address 1 | IP address 1 | Deny all IP addresses |
| IP address 1, IP address 2 | IP address 1 | Allow IP address 2, deny all others |
When you restrict access to a broadcast by IP address, you can specify both Internet Protocol version 6 (IPv6) and Internet Protocol version 4 (IPv4) addresses. IPv6 is the latest version of the Internet Protocol and was designed to accommodate the rapidly increasing demand for unique IP addresses. IPv6 increases the IP address size from 32 bits to 128 bits to support more levels of addressing hierarchy and a greater number of addressable nodes. For more information about IPv6, see the IPv6 page at the Microsoft Web site.
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