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Correct multicast address?

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Correct multicast address?

My WSM server has an IP address = 10.107.8.144 Subnet mask = 255.255.252.0

When I checked the "Enable Multicast" box under the Operating System tab in the WSM console, it prefilled the Multicast address with 233.107.8.144


Is this correct? If not what would the correct address be?

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  • You can either use the preset value or use any valid Multicast IP Address you like: http://en.wikipedia.org/wiki/Multicast_address.

    The upcoming WSM Advanced Administration Guide will cover multicast in detail.
    Here's an excerpt:

    In Internet Protocol version 4 (IPv4), the Class D addresses, 224.0.0.0 to
    239.255.255.255, are used for multicasting. It is recommended that you use the multicast
    IP address range 239.0.0.0 to 239.255.255.255 for WSM multicast streaming. The
    Internet Assigned Numbers Authority (IANA) has reserved this address range as
    Administratively Scoped addresses for use in private multicast domains. Network
    administrators are free to use multicast IP addresses in this range inside of their domain
    without fear of conflicting with others elsewhere in the Internet, so long as such multicast
    traffic will not be passed to the Internet cloud. In fact, it has become a common practice to
    block multicast traffic in these ranges from entering or leaving an Autonomous Domain.
    The Administratively Scoped addresses can be reused in different regions of the network.
    Network administrators should configure their multicast routers to insure that multicast
    traffic in the Administratively Scoped address range does not cross into or out of their
    multicast domain.

    It is also recommend that you assign a distinct multicast IP address for different virtual
    disk images to avoid possible multicast address collisions. For example:
    Vdisk1 - 239.1.0.0
    Vdisk2 - 239.2.0.0
    Vdisk3 - 239.3.0.0

    This practice ensures that all WSM multicast sessions can be run in parallel without
    interfering with each other, regardless of how your WSM environment is set up (see "WSM
    Multicast Q&A" for scenarios where problems can occur if distinct multicast addresses are
    not used).

    For virtual disk version 3.0 or later, if the 3rd and/or 4th multicast IP address octet is
    configured as 255, the WSM multicast server and client will automatically replace it with
    corresponding octet(s) of the WSM streaming server IP from which the virtual disk image
    is streamed.
    For example:
    •If VDisk’s multicast IP is configured as 239.1.255.255:
    ·When this image is streamed from WSM streaming server 192.168.1.99, the multicast address will be 239.1.1.99.
    ·When this image is streamed from WSM streaming server 192.168.2.98, the multicast address will be 239.1.2.98.
    •If VDisk’s multicast IP is configured as 239.1.0.255:
    ·When this image is streamed from WSM streaming server 192.168.1.99, the multicast address will be 239.1.0.99.
    ·When this image is streamed from WSM streaming server 192.168.2.98, the multicast address will be 239.1.0.98.
    •If VDisk’s multicast IP is configured as 239.1.255.0:
    ·When this image is streamed from WSM streaming server 192.168.1.99, the multicast address will be 239.1.1.0.
    ·When this image is streamed from WSM streaming server 192.168.2.98, the multicast address will be 239.1.2.0.

    This process allows a single image to be multicast from different servers over different
    multicast sessions.