[vlc] Re: Link-local multicasting still not working

[Joni Kaki]

Quoting gbazin at altern.org:

> >I think that problem could be that client cannot join in 
> >ff02::1:3:1 multicast group, i dont know the reason for 
> >that. There must be a way to tell vlc to join in the group.

> VLC should be joining the group properly (At least from my understanding
> of the code). My suspicion would rather go to a routing problem on the
> server side.
> 
> What do you get with a ping to the multicast address done on the server
> side ?

~ # ping6 -I eth0 ff02::1:3:1
PING ff02::1:3:1(ff02::1:3:1) from fe80::2e0:3ff:fe05:43ec eth0: 56 data bytes

if there is no client and server running no answer

Then if i start server
64 bytes from fe80::2e0:3ff:fe05:4c4b: icmp_seq=27 ttl=64 time=4.16 ms

> Can you also try when the client is connected ?

Then if i start client vlc udp6:@[ff02::1:3:1%eth0] and ping ff02::1:3:1 only 
server responds
64 bytes from fe80::2e0:3ff:fe05:4c4b: icmp_seq=45 ttl=64 time=3.23 ms

if i ping all-nodes-multicast ff02::1 both will respond as they should
PING ff02::1(ff02::1) from fe80::2e0:3ff:fe05:43ec eth0: 56 data bytes
64 bytes from ::1: icmp_seq=1 ttl=64 time=0.268 ms
64 bytes from fe80::2e0:3ff:fe05:4c4b: icmp_seq=1 ttl=64 time=3.52 ms (DUP!)

> Do you have several network interfaces on the server ?

Both have 1 interface...

CLIENT:

eth0      Link encap:Ethernet  HWaddr 00:E0:03:05:43:EC
          inet6 addr: fe80::2e0:3ff:fe05:43ec/10 Scope:Link
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1

~ # ip -6 route show
fe80::/10 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
default dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
unreachable default dev lo  metric -1  error -101

~ # route -A inet6
Kernel IPv6 routing table
Destination                                 Next Hop
    Flags Metric Ref    Use Iface
::1/128                                     ::
    U     0      0        0 lo
fe80::2e0:3ff:fe05:43ec/128                 ::
    U     0      66       1 lo
fe80::/10                                   ::
    UA    256    0        0 eth0
ff00::/8                                    ::
    UA    256    0        0 eth0
::/0                                        ::
    UDA   256    0        0 eth0


SERVER:

eth0      Link encap:Ethernet  HWaddr 00:E0:03:05:4C:4B
          inet6 addr: fe80::2e0:3ff:fe05:4c4b/10 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

~ # ip -6 route show
fe80::/10 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
ff00::/8 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
default dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
unreachable default dev lo  metric -1  error -101

~ # route -A inet6
Kernel IPv6 routing table
Destination                                 Next Hop
    Flags Metric Ref    Use Iface
::1/128                                     ::
    U     0      0        0 lo
fe80::2e0:3ff:fe05:43ec/128                 fe80::2e0:3ff:fe80:43ec
    UAC   0      1        1 eth0
fe80::2e0:3ff:fe05:43ec/128                 ::
    U     0      4        0 lo
ff02::1:3:1                                 ff02::1:3:1
    UAC   0      56       1 eth1
fe80::/10                                   ::
    UA    256    0        0 eth0
ff00::/8                                    ::
    UA    256    0        0 eth0
::/0                                        ::
    UDA   256    0        0 eth0




 - Joni

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