Black Box Corporation LWN602WA Manual De Usuario
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Chapter 8: Basic Configuration Examples
GRE selective multicast forwarding allows you to determine whether a specific multicast group or set of multicast groups can
receive multicast packets, or whether the SmartPath AP blocks all or no multicast packets.
receive multicast packets, or whether the SmartPath AP blocks all or no multicast packets.
Filtering multicast packet occurs in two main ways: by blacklisting and whitelisting. You cannot use blacklists and whitelists
together because their operations are mutually exclusive; however, you can modify each to suit your particular requirements. To
set a blacklist or whitelist, you must first define a default rule to block or allow all, and then you can add exceptions as needed.
together because their operations are mutually exclusive; however, you can modify each to suit your particular requirements. To
set a blacklist or whitelist, you must first define a default rule to block or allow all, and then you can add exceptions as needed.
Figure 8-13. Filtering multicast packets.
By default, a SmartPath AP forwards all multicast packets. To customize IP multicast filtering, enter the following in SmartPath
EMS VMA:
EMS VMA:
1. Click Configuration > Advanced Configuration > Management Services > Management Options, and then click New.
2. Enter a name for the new management options object in the Name text box. This name can be up to 32 characters long.
3. In the GRE Tunneling Selective Multicast Forwarding section, select whether you want to begin with an open filter by selecting
Allow All, or a closed filter by selecting Block All.
NOTE: For most applications, you want to begin with a closed filter and then specify the multicast addresses you want to forward
through the GRE tunnels. The steps that follow assume that this is the case, and that Block All is selected.
through the GRE tunnels. The steps that follow assume that this is the case, and that Block All is selected.
4. In the Exception IP List, enter the following, and then click “Apply:”
IP: Enter the IP address of the multicast address (for example, 224.1.1.10). You can also enter the network address of a multicast
subnet (e.g., 224.1.1.0).
subnet (e.g., 224.1.1.0).
Netmask: If you entered a network address in the IP column above, then enter the subnet mask here that includes all the
addresses of that network. For example, if you entered 224.1.1.0 in the IP column and wish to include 224.1.1.1 and 224.1.1.2,
then enter 255.255.255.252 (a 30-bit mask). However, if you entered an IP address in the IP column, then enter 255.255.255.255.
addresses of that network. For example, if you entered 224.1.1.0 in the IP column and wish to include 224.1.1.1 and 224.1.1.2,
then enter 255.255.255.252 (a 30-bit mask). However, if you entered an IP address in the IP column, then enter 255.255.255.255.
5. If there are additional IP multicast addresses or ranges you want to add to the exception list, repeat Step 4 for each address or
range. When done, click “Save.”