All things related to multicast

["Lucy E. Lynch" <>]

mtrace 128.223.214.23 128.182.61.51
Mtrace from 128.223.214.23 to 128.182.61.51 via group 224.2.0.1
Querying full reverse path... * switching to hop-by-hop:
  0  sandoz.psc.edu (128.182.61.51)
 -1  packet shorter (576 bytes) than hdr+data len (20+1016)
* packet shorter (576 bytes) than hdr+data len (20+1016)
* * Timed out receiving responses
Perhaps receiver 128.182.61.51 is not a member of group 224.2.0.1,
or no router local to it has a route for source 128.223.214.23,
or multicast at ttl 64 doesn't reach its last-hop router for that source



Lucy E. Lynch                           Academic User Services
Computing Center                        University of Oregon

                (541) 346-1774
Cell: (541) 912-7998                    

Key fingerprint =  2C 80 2F 8C 5F 68 37 E3  AC 16 09 F1 36 E4 61 15 

On Mon, 8 Jan 2001, Michael H. Lambert wrote:

> To update the responses I have received (thank you!):
> 
> IOS Versions:  internal router     12.1(3a)T1  [RSP2]
>                border router       12.0(12)S   [RSP4]
> 
> I changed the addresses of the RPs after verifying that the previous ones
> didn't pass RPF checks in the Abilene core.
> 
> I'm not sure how often the SDP announcement is being sent (it's being
> originated by SDR under MS Windows and exhibiting the usual black-box
> behavior of that OS).  I'm going to see if I can get some of the tools up
> under FreeBSD.
> 
> Behavior I'm seeing now:  The internal router carries the announcement for
> three minutes; it disappears for a while (hard to time); it comes back for
> another three minutes.  It's not showing up in the sa-cache on the border
> router at all.
> 
> Any more hints?
> 
> Thanks,
> 
> Michael
>