From: Ccie candidate (beacc1e@yahoo.com)
Date: Wed Dec 18 2002 - 10:09:07 GMT-3
Kumar,
I believe is "ip multicast helper"just to map broadcast to multicast, and vice versa via the UDP port specified by an ACL. I don't think you can use it to map a specific host address.
Does anybody has a different view of this ?
Kafkaf
-----Original Message-----
From: Kumar, Senthil [mailto:senthil.kumar@intechnology.co.uk]
Sent: Wednesday, December 18, 2002 5:08 AM
To: Don; Sean Garrett
Subject: RE: unicast-2-multicast
i did this.
three routers connected back to back. r1 is the host connected to r2
connected to r3 connected to r4.
created a tunnel between r2 and r4 and enabled pim dense mode.
the def gateway & mroute static 0.0.0.0 255.255.255.255 for r1 is r2.
r4's ethernet joined group 229.9.9.9.
r2 can reach this group via tunnel (ping 229.9.9.9 - router generates a
multicast packet in all interfaces)
r1 can't ping r4 unlesss the r2 has pim enabled on the interface connected
to r2.
did a multicast helper-map, udp forward in r2 .. no results.
wondering if the example in the cisco web explaining mulitcast helper-map
really works.
-----Original Message-----
From: Don [mailto:seadon@attbi.com]
Sent: 16 December 2002 19:54
To: Sean Garrett
Subject: Re: unicast-2-multicast
You do use a subnet on the tunnel. The problem with including the tunnel in
a routing protocol is that the protocol sees the tunnel as a route. If the
real route is also included in the same protocol, you get recursive errors
and the tunnel shuts itself down. Real life often uses static routes to get
aroung the problem, but this is usually not be allowed on the lab test. I
don't even know if static mroutes are allowed. Another method that works is
to only include one end of the tunnel in the routing protocol, but this
results in some sub-optimal routes. This is all highly dependent on what
you are trying to do with the tunnel. Having only one end included in the
routing protocol and no static routes means the tunnel is only used for
packets in that subnet only. And what use is that in an internal network?
Don
----- Original Message -----
From: "Sean Garrett" <SGarrett@cnitech.com>
To: "Don" <seadon@attbi.com>; "Kumar, Senthil"
<senthil.kumar@intechnology.co.uk>; "Abdallah Al-Suwailem"
Cc: <ccielab@groupstudy.com>
Sent: Monday, December 16, 2002 11:27 AM
Subject: RE: unicast-2-multicast
If you aren't given a subnet to use on the tunnel itself,
what should you use there? Chop up one of the /24s given
at either end to use across the tunnel?
-----Original Message-----
From: Don [mailto:seadon@attbi.com]
Sent: Monday, December 16, 2002 11:01 AM
To: Kumar, Senthil; Abdallah Al-Suwailem
Subject: Re: unicast-2-multicast
You can use a tunnel interface to get multicast across a link that only
supports unicast. Create a tunnel from one end to the other and then enable
multicast on the tunnel interfaces (and, of course, on the router interfaces
that do support multicast). This also works to load share multicast traffic
across multple links, something multicast cannot do by itself. PIM requires
all multicast interfaces to be in a unicast routing table and this can be a
problem with tunnels. If so, add a static multicast route (ip mroute
command) to fix this problem. See Doyle, Vol 2 page 596 for an example.
Don
----- Original Message -----
From: "Kumar, Senthil" <senthil.kumar@intechnology.co.uk>
To: "Abdallah Al-Suwailem" <aalsuwailem@myrealbox.com>; "Kumar, Senthil"
<senthil.kumar@intechnology.co.uk>
Cc: <ccielab@groupstudy.com>
Sent: Monday, December 16, 2002 8:21 AM
Subject: RE: unicast-2-multicast
> many thanks for your reply. but i was wondering i could could map even all
> unicasts to a host on a particular protocol and port number to convert it
> into a multicast to feed the multicast domain.. i've tried using
helper-map,
> configs look okay but couldnt figure out a method to do testing with it.
did
> permit udp any any broadcast-2-multicast-2broadcast. did forward protocol
> udp
> and enabled directed-broadcast..did a ping on the local segment x.x.x.255
> and 255.255.255.255 ..got reply from the local broadcast domain but the
> remote never replied..
>
>
>
> -----Original Message-----
> From: Abdallah Al-Suwailem [mailto:aalsuwailem@myrealbox.com]
> Sent: 16 December 2002 16:08
> To: Kumar, Senthil
> Cc: ccielab@groupstudy.com
> Subject: Re: unicast-2-multicast
>
>
>
> Hello
>
> check this command "r2(config-if)#ip multicast helper-map"
>
> r2(config-if)#ip multicast ?
> boundary Boundary for administratively scoped multicast addresses
> helper-map Broadcast to Multicast map OR Multicast to Broadcast map
> rate-limit Rate limit multicast data packets
> tagswitch Enable IP Multicast Tagswitching
> ttl-threshold TTL threshold for multicast packets
>
> Thanks
>
> Abdallah
>
> Kumar, Senthil wrote:
>
> >can nat convert all traffic on a local network, @ port xx.udp to
> mulitcast,
> >haven't got a traffic generator to test.
> >the idea is for the host on my brodcast lan to send data to multicast
> >machines hops away. my firsthop doesnt do mulitcast routing..
> >
> >any ideas, help very appreciated.
> >
> >Thanks, Senthil
> >
> >
> >
> >
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