From: Kumar, Senthil (senthil.kumar@intechnology.co.uk)
Date: Tue Dec 17 2002 - 09:04:43 GMT-3
unnumbered tunnel looks like the right option, run no routing protocol on
tunnel and do dense mode should sort it out..
let me try and feedback.
many thanks Don.
-----Original Message-----
From: Don [mailto:seadon@attbi.com]
Sent: 16 December 2002 19:54
To: Sean Garrett
Cc: ccielab@groupstudy.com
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"
<aalsuwailem@myrealbox.com>
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
Cc: ccielab@groupstudy.com
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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