On 05/23/2014 03:37 PM, Stephen John Smoogen wrote:



On 23 May 2014 16:12, ToddAndMargo <[email protected]
<mailto:[email protected]>> wrote:

    On 05/23/2014 02:25 PM, ToddAndMargo wrote:

        This is why I ask (VLC's doing):

        kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10
        DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP
        SPT=5353 DPT=5353 LEN=36

        eth0.5 is a virtual Ethernet too, not hooked to the Internet.

        And port 3535 UDP?

        $ grep -i 3535 /etc/services
        ms-la           3535/tcp                # MS-LA
        ms-la           3535/udp                # MS-LA


    I wonder why VLC goes out looking on eth0.5?
    And why port 3535 UDP?

    $ ip route show
    192.168.250.0/24 <http://192.168.250.0/24> dev eth1  proto kernel
      scope link  src 192.168.250.133
    192.168.122.0/24 <http://192.168.122.0/24> dev virbr0  proto kernel
      scope link  src 192.168.122.1
    192.168.254.0/24 <http://192.168.254.0/24> dev eth0.5  proto kernel
      scope link  src 192.168.254.10
    192.168.255.0/24 <http://192.168.255.0/24> dev br0  proto kernel
      scope link  src 192.168.255.10
    169.254.0.0/16 <http://169.254.0.0/16> dev eth1  scope link  metric 1003
    169.254.0.0/16 <http://169.254.0.0/16> dev br0  scope link  metric 1004
    169.254.0.0/16 <http://169.254.0.0/16> dev eth0.5  scope link
      metric 1005
    default via 192.168.250.1 dev eth1


I would expect it is so that you could stream the video etc to multiple
desktops at the same time. So if your network supported multicast and
you had say a bunch of different stations they could all get the same
stream without the linear growth of traffic.

Multicast was all the thing in the mid 1990's with universities and such
looking at if for their remote learning and entertainment looking to use
it for movies and such. The problem is that multicast has all kinds of
corner cases which sidelined it because it tended to take out top level
routers. Today I believe it is used for small dedicated networks.

--
Stephen J Smoogen.


Hi Stephen,

   That explains it.  Thank you!

-T

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