From: Ellie Chou (ellie_chou@hotmail.com)
Date: Sun Mar 14 2004 - 16:49:41 GMT-3
I agree that "ip directed-broadcast" should be enabled on the outgoing
interface of the last hop. but how about the incoming interface of both
the first and the last hop? I see it configured on the example in the doc
CD but is it necessary?
The command guide says it's to "enable the translation of a directed
broadcast to physical broadcasts", and I think the only place that needs
it is the outgoing interface of the last hop. am I missing something
here?
thanks!
Ellie
>From: "William Chen" >Reply-To: "William Chen" >To: , >Subject: Re: ip
multicast helper-map - ip directed broadcast >Date: Thu, 4 Mar 2004
21:47:12 +0800 > >Hi, > > You are right. There is a mistake of this
example in DocCD. I have done a >lab in DoiT workbook from netmasterclass
(www.netmasterclass.com), which >gives a very good pratice of this
feature. > > Moreover, in order to generate UDP packets for testing
without any >traffic generator, you can use extended traceroute. > >Best
Regards, >William Chen > >----- Original Message ----- >From: >To: >Sent:
Thursday, March 04, 2004 5:29 PM >Subject: ip multicast helper-map - ip
directed broadcast > > > > Looking at the "ip multicast helper" example
on the Doc CD reachable via: > > > >
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcpt3/1cfmulti.htm#1003511
> > > > I don't understand how the directed broadcast, created from the
multicast >stream at the incoming interface of the last hop router, is
sent out on the >outgoing interface as physical broadcast using default
interface >configuration. > > > > Because this interface will just drop
the directed broadcast arriving at >the interface. In order to prevent
this from happening the command "ip >directed broadcast should" be
configured on the outgoing interface of the >last hop router. > > > >
Since this example doesn't say anything about that, I'm still wondering
if >this is correct, could somebody confirm this? > > > >
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