All things related to multicast

[Bruce Curtis <>]

On Apr 13, 2007, at 11:46 AM, Stig Venaas wrote:

> Bruce Curtis wrote:
> > On Apr 3, 2007, at 1:07 PM, Nicholas J Humfrey wrote:
> > > Hi,
> > >
> > > The University of Southampton is connected to m6bone/Géant via a  
> > > tunnel. I am able to asmping and ssmping Stig's ssmping server in  
> > > Norway ok. I am unsure of the details of how m6bone is connected  
> > > to Internet 2?
> > >
> > >
> > > Using asmping to test multicast connectivity to Norway (using our  
> > > own embedded-RP):
> > > asmping -6 ff7e:140:2001:630:d0:f000:4321:1234 ssmping.uninett.no
> > >
> > > Using ssmping to test SSM connectivity to Norway:
> > > ssmping -6 ssmping.uninett.no
> > >
> > >
> > > We have an ssmping server on our network, are you able to ping it?
> > > ssmping -6 ssmping.ecs.soton.ac.uk
> > > asmping -6 ff7e:140:2001:630:d0:f000:4321:1234  
> > > ssmping.ecs.soton.ac.uk
> > >
> > >
> > > Anyone else had any success from Internet2?
> > >
> > >
> > > nick
> >   I see that I did get one multicast packet.  Also I see that  
> > state was built for the asmping group ff7e: 
> > 140:2001:630:d0:f000:4321:1234.
> >   But state was not built for ff7e:140:2001:630:d0:f000:8000:1217.
>
> Note that asmping forces the last 32 bits to be 4321:1234. This in
> an attempt to avoid it being used to attack arbitrary multicast
> sessions.

Right.

Even when I join ff7e:140:2001:630:d0:f000:8000:1217 with VLC I don't  
get state.  Or rather I do get (*,G) state but I don't get any (S,G)  
state.


> Not sure if a good idea though.

It seem like a reasonable protection.



> > asmping -6 ff7e:140:2001:630:d0:f000:4321:1234  
> > ssmping.ecs.soton.ac.uk
> > asmping joined (S,G) = (*,ff7e:140:2001:630:d0:f000:4321:1234)
> > pinging 2001:630:d0:f104::de80 from 2001:4930:95::203:93ff:feda:c552
> >   unicast from 2001:630:d0:f104::de80, seq=1 dist=16 time=136.482 ms
> >   unicast from 2001:630:d0:f104::de80, seq=2 dist=16 time=136.547 ms
> > multicast from 2001:630:d0:f104::de80, seq=2 dist=12 time=284.441 ms
> >   unicast from 2001:630:d0:f104::de80, seq=3 dist=16 time=136.419 ms
> >   unicast from 2001:630:d0:f104::de80, seq=4 dist=16 time=136.311 ms
> >   unicast from 2001:630:d0:f104::de80, seq=5 dist=16 time=136.288 ms
>
> Interesting. The shared tree must have been established with  
> embedded-RP
> working all the way from receiver to the RP at least. But not sure how
> this can happen...
>
> Stig


  I checked again and today I still see the same result, just one  
multicast packet.  My router reports just one packet also.

  I haven't gotten back to this until now.  When I first saw the  
single packet I was thinking something with registers and tunnels but  
I'll need to go back and review how IPv6 Multicast works compared to  
IPv4.

show ipv6 mroute ff7e:140:2001:630:d0:f000:4321:1234 count
IP Multicast Statistics
74 routes, 23 groups, 0.13 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits  
per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: FF7E:140:2001:630:D0:F000:4321:1234
  RP-tree:
   RP Forwarding: 0/0/0/0, Other: 0/0/0
   LC Forwarding: 0/0/0/0, Other: 0/0/0
   HW Forwd:   0/0/0/0, Other: NA/NA/NA
  Source: 2001:630:D0:F104::DE80,
   RP Forwarding: 1/0/98/0, Other: 0/0/0
   LC Forwarding: 0/0/0/0, Other: 0/0/0
   HW Forwd:   0/0/0/0, Other: NA/NA/NA
  Tot. shown: Source count: 1, pkt count: 1


> >   unicast from 2001:630:d0:f104::de80, seq=6 dist=16 time=136.911 ms
> >   unicast from 2001:630:d0:f104::de80, seq=7 dist=16 time=136.467 ms
> >   unicast from 2001:630:d0:f104::de80, seq=8 dist=16 time=136.350 ms
> >   unicast from 2001:630:d0:f104::de80, seq=9 dist=16 time=136.354 ms
> >   unicast from 2001:630:d0:f104::de80, seq=10 dist=16 time=136.486 ms
> >   unicast from 2001:630:d0:f104::de80, seq=11 dist=16 time=136.497 ms
> >   unicast from 2001:630:d0:f104::de80, seq=12 dist=16 time=136.549 ms
> >   unicast from 2001:630:d0:f104::de80, seq=13 dist=16 time=136.602 ms
> >   unicast from 2001:630:d0:f104::de80, seq=14 dist=16 time=136.484 ms
> >   unicast from 2001:630:d0:f104::de80, seq=15 dist=16 time=136.381 ms
> >   unicast from 2001:630:d0:f104::de80, seq=16 dist=16 time=136.599 ms
> >   unicast from 2001:630:d0:f104::de80, seq=17 dist=16 time=137.050 ms
> >   unicast from 2001:630:d0:f104::de80, seq=18 dist=16 time=136.161 ms
> >   unicast from 2001:630:d0:f104::de80, seq=19 dist=16 time=136.377 ms
> >   unicast from 2001:630:d0:f104::de80, seq=20 dist=16 time=137.038 ms
> > show ipv6 mroute ff7e:140:2001:630:d0:f000:4321:1234
> > Multicast Routing Table
> > Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group,
> >        C - Connected, L - Local, I - Received Source Specific Host  
> > Report,
> >        P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit  
> > set,
> >        J - Join SPT
> > Timers: Uptime/Expires
> > Interface state: Interface, State
> > (*, FF7E:140:2001:630:D0:F000:4321:1234), 00:00:47/never, RP  
> > 2001:630:D0:F000::1, flags: SCJ
> >   Incoming interface: Vlan107
> >   RPF nbr: FE80::212:1EFF:FE08:C8DB
> >   Immediate Outgoing interface list:
> >     Vlan95, Forward, 00:00:47/never
> > (2001:630:D0:F104::DE80, FF7E:140:2001:630:D0:F000:4321:1234),  
> > 00:00:46/00:02:43, flags: SJT
> >   Incoming interface: Vlan107
> >   RPF nbr: FE80::212:1EFF:FE08:C8DB
> >   Inherited Outgoing interface list:
> >     Vlan95, Forward, 00:00:47/never
> > core-a.ndsu#show ipv6 mroute ff7e:140:2001:630:d0:f000:4321:1234  
> > count
> > IP Multicast Statistics
> > 74 routes, 23 groups, 0.13 average sources per group
> > Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits  
> > per second
> > Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
> > Group: FF7E:140:2001:630:D0:F000:4321:1234
> >   RP-tree:
> >    RP Forwarding: 0/0/0/0, Other: 0/0/0
> >    LC Forwarding: 0/0/0/0, Other: 0/0/0
> >    HW Forwd:   0/0/0/0, Other: NA/NA/NA
> >   Source: 2001:630:D0:F104::DE80,
> >    RP Forwarding: 1/0/98/0, Other: 0/0/0
> >    LC Forwarding: 0/0/0/0, Other: 0/0/0
> >    HW Forwd:   0/0/0/0, Other: NA/NA/NA
> >   Tot. shown: Source count: 1, pkt count: 1
> > core-a.ndsu#show ipv6 mroute ff7e:140:2001:630:d0:f000:4321:1234  
> > count
> > IP Multicast Statistics
> > 74 routes, 23 groups, 0.13 average sources per group
> > Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits  
> > per second
> > Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
> > Group: FF7E:140:2001:630:D0:F000:4321:1234
> >   RP-tree:
> >    RP Forwarding: 0/0/0/0, Other: 0/0/0
> >    LC Forwarding: 0/0/0/0, Other: 0/0/0
> >    HW Forwd:   0/0/0/0, Other: NA/NA/NA
> >   Source: 2001:630:D0:F104::DE80,
> >    RP Forwarding: 1/0/98/0, Other: 0/0/0
> >    LC Forwarding: 0/0/0/0, Other: 0/0/0
> >    HW Forwd:   0/0/0/0, Other: NA/NA/NA
> >   Tot. shown: Source count: 1, pkt count: 1
> > show ipv6 mroute ff7e:140:2001:630:d0:f000:8000:1217
> > Multicast Routing Table
> > Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group,
> >        C - Connected, L - Local, I - Received Source Specific Host  
> > Report,
> >        P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit  
> > set,
> >        J - Join SPT
> > Timers: Uptime/Expires
> > Interface state: Interface, State
> > (*, FF7E:140:2001:630:D0:F000:8000:1217), 02:16:31/never, RP  
> > 2001:630:D0:F000::1, flags: SCJ
> >   Incoming interface: Vlan107
> >   RPF nbr: FE80::212:1EFF:FE08:C8DB
> >   Immediate Outgoing interface list:
> >     Vlan95, Forward, 02:16:31/never
> > > On 3 Apr 2007, at 18:43, Bruce Curtis wrote:
> > >
> > > >   Have you made the IPv6 multicast streams available to Internet2?
> > > >
> > > >   I've tried to connect to ff7e:140:2001:630:d0:f000:8000:1217  
> > > > but it doesn't work.
> > > >
> > > >   I have successfully viewed an IPv6 stream from the Vatican  
> > > > which also used enbedded RP.
> > > >
> > > >
> > > > On Apr 3, 2007, at 11:19 AM, Nicholas J Humfrey wrote:
> > > >
> > > > > Apologies for cross-posting.
> > > > >
> > > > >
> > > > > I have made three more of the Virgin Radio satellite streams  
> > > > > available on IPv4 and IPv6 multicast:
> > > > >
> > > > > - Virgin Radio Groove
> > > > > - Virgin Radio Classic Rock
> > > > > - Virgin Radio Xtreme
> > > > >
> > > > > More information is available at:
> > > > > http://www.multicast.org.uk/virginradio/
> > > > >
> > > > > They are all MPEG-1 Audio Layer-2 streams (payload 14) over RTP  
> > > > > on port 5004.
> > > > >
> > > > >
> > > > > Virgin Radio have also made some Windows Media Player multicast  
> > > > > streams available themselves:
> > > > >
> > > > > http://www.virginradio.co.uk/about_us/technology_services/ 
> > > > > multicast/
> > > > >
> > > > >
> > > > > Thanks,
> > > > >
> > > > > nick.
> > > >
> > > >
> > > > ---
> > > > Bruce Curtis                         
> > > >
> > > > Certified NetAnalyst II                701-231-8527
> > > > North Dakota State University
> > ---
> > Bruce Curtis                         
> >
> > Certified NetAnalyst II                701-231-8527
> > North Dakota State University


---
Bruce Curtis                         

Certified NetAnalyst II                701-231-8527
North Dakota State University