multicast helper-map, connecting 2 broadcast network through

hello GS guys..

I'm following this guide for doing a small lab regarding the use of a
multicast helper for connecting 2 broadcast networks..

I'm reading this:

http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_igmp/configuration/12-4t/imc_interm_mc_helper.html

I'm sure I've already done this lab times ago and it was working.. I'm
pretty sure I was using IOU at that time and now it's not working, nor with
IOU nor with dynamips.

the lab is small:

R1 - R2 - R3 - R4 - R5

from R2 to R4 it's a multicast enabled network and on R1 and R5 I've enable
Rip v2.

I've setup everything like it should be:

################
R1: rip enabled (v2) and on interface between R1 and R2 I've put ip rip
v2-broadcast
################
R5: rip enabled (v2)
################
R2: I've setup an helper-map like this one: ip multicast helper-map
broadcast 224.1.1.1 100
R2: I've setup an acl like this one: access-list 100 permit udp host
10.1.12.1 eq rip host 255.255.255.255 eq rip log
R2: enabled this: ip forward-protocol udp rip
################
R4: I've setup and helper-map that take the traffic from 224.1.1.1 and send
to broadcast address of network between R4 and R5 if that matches acl 100
ip multicast helper-map 224.1.1.1 10.1.45.255 100
R4: acl 100 of course: access-list 100 permit udp host 10.1.12.1 any eq rip
log
R4: enabled this: ip forward-protocol udp rip
################

multicast-routing is enabled on R2,R3,R4 and R2 is the bsr candidate and MA
for the network.
on R3 and R4 I can see the rp mapping.

ospf is enabled on R2,R3,R4

everything looks fine (to me) but it doesn't work.

If I do a capture I see the broadcast traffic coming from R1, matching the
access-list 100 and then stop.
Despite this on R3 and R4 I see the mroute 224.1.1.1

If I do a capture on R4 I don't get any traffic matching the acl 100.

I've checked and re-checked the configuration guide (the link above) and I
don't understand what I miss.

Looks like the R2 is not able to convert the traffic from broadcast to
multicast and therefore the traffic is not reaching R4.

anyone see an error in what I've done?

tnx in advance

-- 
ccie99999
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