On 23 May 2014 16:12, ToddAndMargo <toddandma...@zoho.com> 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 dev eth1 proto kernel scope link src 192.168.250.133 > 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 > 192.168.254.0/24 dev eth0.5 proto kernel scope link src 192.168.254.10 > 192.168.255.0/24 dev br0 proto kernel scope link src 192.168.255.10 > 169.254.0.0/16 dev eth1 scope link metric 1003 > 169.254.0.0/16 dev br0 scope link metric 1004 > 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.
