ping multicast addr of myself on serial interface

From: xuping (cnmiecxu@xxxxxxxxxxxxxxxxx)
Date: Thu Jul 06 2000 - 04:40:48 GMT-3

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Hi
I have only two routers connected B-to-B via serial, here is config

R1
!
ip multicast routing
!
interface serial 0
 ip address 1.1.1.1 255.255.255.0
 ip pim dense-mode
 ip igmp join-group 224.1.1.1
 clock rate 64000

R2
!
ip multicast routing
!
interface serial 0
 ip address 1.1.1.2 255.255.255.0
 ip pim dense-mode
!

Whe I ping 224.1.1.1 from R2, it's ok; but I can't ping 224.1.1.1 from R1,
why?
(the interfaces are up up, unicast pings are ok)

TIA
xuping

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