RE: [Manet-dt] Link local Multicast Address - MANET Routers

["Joe Macker" <[e-mail]>]

I am on vacation but I will also chime in.
I think we should look at common issues across routing protocols.

Plenty of  material written already... plenty of issues.
New protocols have been spec'd to use AH/ESP. This is not a panacea.

See
http://www.rpsec.org/
for some issues and presentations.

>-----Original Message-----
>From: Ian Chakeres [mailto:[e-mail]] 
>Sent: Tuesday, April 18, 2006 12:40 PM
>To: Brian Haberman
>Cc: [e-mail]
>Subject: Re: [Manet-dt] Link local Multicast Address - MANET Routers
>
>Comments inline.
>
>On 4/18/06, Brian Haberman <[e-mail]> wrote:
>> In what context would this common address be used?
>
>The common address will be used for link local MANET routing 
>protocol packets.
>
>In NHD the address will be used for HELLO messages - all 
>messages In OLSRv2 it will be used for TC messages - all 
>messages In DYMO it will be used for RREQ, RREP, & RERR 
>messages - all messages
>
>> Do we expect MANETs to exist that run multiple routing protocols?
>
>Given the common packet format, and soon to be common 
>neighborhood discovery, I think multiple MANET routing 
>protocol components may be run together in the future.
>
>> If so, the filtering now has to be done above the MAC 
>filters (i.e. on 
>> port or protocol numbers) which will affect power consumption.
>
>Yes, but using a different multicast address for each protocol 
>will require that each protocol's messages be carried in 
>separate packets.
>The consequence of carrying each protocols messages in their 
>own IP packets can increase wireless media access significantly.
>
>> What about security issues of sending packets that are not 
>meant for a 
>> subset of routers, but are received by them due to the 
>shared address?
>
>I do not see this as an issue to be addressed by the base 
>MANET protocols.
>
>We are discussing authentication of routing packets for the base spec.
>
>> In short, I would like to see a description of how this address will 
>> be used before I make any judgment.
>
>Does the discussion above help?
>
>Ian
>
>Note - this address would be very similar to OSPF (RFC 2328) 
>AllSPFRouters
>
>o   Use of IP multicast.  Some OSPF messages are multicast, when
>        sent over broadcast networks.  Two distinct IP multicast
>        addresses are used.  Packets sent to these multicast addresses
>        should never be forwarded; they are meant to travel a 
>single hop
>        only.  To ensure that these packets will not travel multiple
>        hops, their IP TTL must be set to 1.
>
>        AllSPFRouters
>            This multicast address has been assigned the value
>            224.0.0.5.  All routers running OSPF should be prepared to
>            receive packets sent to this address.  Hello packets are
>            always sent to this destination.  Also, certain OSPF
>            protocol packets are sent to this address during the
>            flooding procedure.
>
>  AllDRouters
>            This multicast address has been assigned the value
>            224.0.0.6.  Both the Designated Router and Backup 
>Designated
>            Router must be prepared to receive packets destined to this
>            address.  Certain OSPF protocol packets are sent to this
>            address during the flooding procedure.
>
>> Regards,
>> Brian
>>
>> On Apr 15, 2006, at 18:05, Ian Chakeres wrote:
>>
>> > Now that we have a common packet building block, and will 
>soon have 
>> > a common neighborhood discovery building block, I think it 
>is pretty 
>> > natural to use a common multicast address for reaching link-local 
>> > MANET routers. Please reply if you support this common multicast 
>> > address being allocated.
>> >
>> > If I receive support I will start moving on this.
>> >
>> > Ian Chakeres
>> >
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