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RE: [psg.com #245] Mixed host/router behavior



 > > Per RFC 2461 the per router list is per interface.
 > > There is an issue for the implementations (probably all 
 > implementations)
 > > which have a per-node default router list, but from the perspective
 > > of the RFC 2461 specification it has already punted on all 
 > aspects of
 > > multi-interfaced hosts.
 > 
 > Yes, so if we allow the mixed behavior, then it is probably 
 > reasonable
 > to allow the node to accept RAs on a "host" interface and to 
 > configure
 > default routers on that interface.  My point is that we should
 > *explicitly* note that the rule for the multi-interfaced hosts also
 > applies to the host-side interfaces on a mixed-behavior node.

=> We can explicitly state it but I think an important point here is that
the spec already allows for this. We can always add more text I suppose, 
it's a matter of taste. 

 > 
 > >> So, (if we concentrate on the "simple" cases), I think we should
 > >> emphasize that even if an interface is not an advertising 
 > interface
 > >> the node still acts as a router on that interface (e.g., it can
 > >> forward from/to that interface, exchange routing 
 > information on that
 > >> interface, etc)
 > 
 > > Whether or not we concentrate on the "simple" case, I think it
 > > makes sense to state that a non-advertising interface is still
 > > one that behaves as a router e.g. the R-bit in the NA should be set
 > > since another router might redirect hosts to use the 
 > router that doesn't
 > > advertise itself.
 > 
 > Hmm, I agree.  Let me rephrase this point then:
 > 
 > - if we concentrate on the "simple" cases, then we should 
 > emphasize in
 >   rfc2461bis that even if an interface is not an advertising 
 > interface
 >   the node still acts as a router on that interface (e.g., it can
 >   forward from/to that interface, exchange routing 
 > information on that
 >   interface, set the R-bit in NAs, etc)

=> Which is stated today by virtue of having two separate flags to indicate
whether "routing" is on and whether "advertising" is on.

 > 
 > - if we allow the mixed behavior, then we should emphasize in
 >   rfc2461bis that even if a "router-behavior" interface is not an
 >   advertising interface, the node still acts as a router on that
 >   interface.

=> Are there missing flags in order to allow this or are you suggesting 
more text. If the latter, I can handle that. 

Hesham

 > 
 > 					JINMEI, Tatuya
 > 					Communication Platform Lab.
 > 					Corporate R&D Center, 
 > Toshiba Corp.
 > 					jinmei@isl.rdc.toshiba.co.jp
 > 
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