Multicast to NCSA

[Robert Olson]

Here are mtraces to/from farmer.ncsa.uiuc.edu (the machine Tony Rimovsky is
running vic on):

Could it be the case that the latter form of mtraces aren't showing a
problem in the network, rather a problem in how mtrace works?

--bob

(dyfrig) % mtrace -t 127 141.142.21.149 dyfrig 224.2.177.155
Mtrace from 141.142.21.149 to 140.221.9.172 via group 224.2.177.155
Querying full reverse path... 
  0  dyfrig.mcs.anl.gov (140.221.9.172)
 -1  destiny-11.mcs.anl.gov (140.221.11.253)  PIM  thresh^ 6   [default]
 -2  bluto.ctd.anl.gov (130.202.128.1)  Unknown protocol code 8  thresh^ 0  
 -3  cs-dng.anchor.anl.gov (192.5.170.130)  Unknown protocol code 8
thresh^ 0  Reached RP/Core
 -4  cs-atm0-0-11.ncsa.vbns.net (204.147.129.245)  PIM/Static  thresh^ 0  
 -5  charlie-atm0-5.ncsa.uiuc.edu (141.142.11.2)  PIM  thresh^ 8  
 -6  linus-atm0-15.ncsa.uiuc.edu (141.142.11.137)  PIM  thresh^ 0  
 -7  farmer.ncsa.uiuc.edu (141.142.21.149)
Round trip time 309 ms; total ttl of 10 required.

Waiting to accumulate statistics... Results after 9 seconds:

  Source        Response Dest    Overall     Packet Statistics For Traffic From
141.142.21.149  224.0.1.32       Packet      141.142.21.149 To 224.2.177.155
     v       __/  rtt   21 ms     Rate       Lost/Sent = Pct  Rate
141.142.21.145 
141.142.11.137  linus-atm0-15.ncsa.uiuc.edu 
     v     ^      ttl    1         0 pps        0/3    = --%   0 pps
141.142.11.138 
141.142.11.2    charlie-atm0-5.ncsa.uiuc.edu 
     v     ^      ttl   10         1 pps        0/3    = --%   0 pps
141.142.11.1   
204.147.129.245 cs-atm0-0-11.ncsa.vbns.net 
     v     ^      ttl   10         0 pps        0/3    = --%   0 pps
204.147.129.246
192.5.170.130   cs-dng.anchor.anl.gov Reached RP/Core
     v     ^      ttl   10        86 pps        0/3    = --%   0 pps
192.5.170.129  
130.202.128.1   bluto.ctd.anl.gov 
     v     ^      ttl   10       698 pps        0/3    = --%   0 pps
130.202.128.5  
140.221.11.253  destiny-11.mcs.anl.gov 
     v      \__   ttl   12        97 pps        ?/3            0 pps
140.221.9.172   140.221.9.172
  Receiver      Query Source

(dyfrig) % mtrace -t 127 dyfrig 141.142.21.149  224.2.177.155
Mtrace from 140.221.9.172 to 141.142.21.149 via group 224.2.177.155
Querying full reverse path... * switching to hop-by-hop:
  0  farmer.ncsa.uiuc.edu (141.142.21.149)
 -1  * * * Timed out receiving responses
Perhaps receiver 141.142.21.149 is not a member of group 224.2.177.155,
or no router local to it has a route for source 140.221.9.172,
or multicast at ttl 127 doesn't reach its last-hop router for that source
(dyfrig) %