You are running in sparse mode so you need a RP for multicast.
Your mroute indicates that you do have a RP (4.4.4.4) - do you have reachability to the interface used as the RP ?
BTW,
I tried your configuration in my router.
I'm able to ping if I change the mode from sparse mode to sparse-dense mode.
sparse-dense mode allows you to run multicast without a RP as it floods the information to all interfaces.
Rack1R2#sh run int f0/0
Building configuration...
Current configuration : 151 bytes
!
interface FastEthernet0/0
ip address 10.10.100.2 255.255.255.0
ip pim sparse-dense-mode
ip igmp join-group 224.2.2.2
speed 100
full-duplex
end
Rack1R2#ping 224.2.2.2
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.2.2.2, timeout is 2 seconds:
Reply to request 0 from 10.10.100.2, 8 ms
Rack1R2#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.2.2.2), 00:03:38/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse-Dense, 00:03:38/00:00:00
(10.10.100.2, 224.2.2.2), 00:00:15/00:02:44, flags: PLT
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list: Null
(*, 224.0.1.40), 00:05:12/00:02:52, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse-Dense, 00:05:12/00:00:00
