From: dan.bliss@gmail.com
Date: Tue Oct 17 2006 - 00:45:38 ART
All,
Ok, I have searched the archives and did not find a "definitive" answer for the following questions and would appreciate your assistance:
Where do we "NEED" the "ip directed-broadcast" statements when using multicast helper? And does it matter if the source is a subnet only broadcast or all hosts broadcast? The cisco documentation is very vague and even just plain wrong in parts.
(some of the following is copied from an archived post, i just modified it to save time)
So this is my understanding so far:
| ( ) |
source |--R1--( Mcast )--R2--| Destination
| ^ (_____) ^ ^ |
1 2 3
------------------------------------------------------
The following configuration should go on interface "1"
ip multicast helper-map broadcast 225.5.5.5 100
(where 255.5.5.5 is the multicast address to convert the broadcast to and
"100" is an extended access-list that matches the traffic to convert.)
The following configuration should go on interface "2"
ip multicast helper-map 225.5.5.5 12.255.255.255 100
(where 255.5.5.5 is the same group as previously referenced, 12.255.255.255
is the directed broadcast address of interface "3", and access-list 100 is
the same as previously referenced)
Globally we need an acl to match the traffic on R1 and R2
access-list 100 permit udp any any eq 4000
Globally we need the router to perform the conversion at the process level on R1 and R2
ip forward-protocol udp 4000
------------------------------------------------------------------------
So, where does the ip directed-broadcast statement(s) go? Cisco says point 1 and point 3, are they correct?
I have seen it work with it applied only at point 3 in the diagram only which makes the most sense to me.
Thanks in advance,
Dan Bliss
P.S. Thanks to Pierre-Alex for answering my last multicast question. Much appreciated.
This archive was generated by hypermail 2.1.4 : Wed Nov 01 2006 - 07:29:05 ART