draft-ietf-idmr-igmp-mrdisc-10.txt

[Randy Bush <randy@psg.com>]

                    Yes    No-Objection  Discuss *  Abstain  
Randy Bush          [   ]     [   ]       [ x ]      [   ] 
    
i am not impressed by

   The following are justifications for inventing another router 
   discovery protocol: 
 
           ¡ Using ICMP router discovery is not an appropriate solution 
              for multicast router discovery because: 1.) It may confuse 
              hosts listening to ICMP router advertisements; unicast and 
              multicast topologies may not be congruent.  2.) There is 
              no way to tell from an ICMP router advertisement if a 
              router is running a multicast routing protocol.

but an icmp-based protocol could work
    
           ¡ By making multicast router discovery messages extensible, 
              future enhancements can be made.

completely bogus
    
           ¡ By inventing a generic IP layer message, multiple types of 
              messages per link layer are not needed (i.e. including 
              this functionality as part of IP is better than inventing 
              N discovery protocols for N layer-2 technologies). 

agree, but a new icmp could do it

what could be said is that, because this discovery mechanism uses multicast,
discovery problems will be congruent with payload problems, which is cool.

but the following is just way to bogus, and is worth a discuss

9. Security Considerations 
    
   The Multicast Router Advertisement message may allow rogue machines 
   to masquerade as multicast routers.  This could allow those machines 
   to eavesdrop on multicast data transmission or create a denial of 
   service attack on multicast flows.  However, these new messages are 
   extensible and that allows for the introduction of security 
   associations into the protocol.  These security extensions could be 
   used to authenticate or encrypt the messages.