Re: FW: Marcelo's review of mobike protocol

El 17/10/2005, a las 12:44, Jari Arkko escribió:

> Tero Kivinen wrote:
>
>> marcelo bagnulo braun writes:
>>
>>>> There should not be problems with the ingress filters, as we always
>>>> use the source address associated to the given interface when 
>>>> sending
>>>> packets out. I.e. if we have two interfaces A and B, having IPa and
>>>> IPb,  when we send packets out using IPa we always select interface 
>>>> A.
>>>> The network connected to the interface should allow IPa to pass
>>>> through it as it is IP address given by the network to the host for
>>>> that interface. Implementations might need to do specific things to
>>>> bypass routing of those packets (using default route or similar) to
>>>> make use they are really sent out from the host using proper
>>>> interface.
>>>>
>>>>
>>> yes in this case there shouldn't be problems with ingress filters. 
>>> However, as i understand it, it is expected that a common 
>>> multihoming scenario is that multiple PA address blocks are assigned 
>>> to a multihomed site (one per isp serving the site), so that there 
>>> will be multiple global addresses assigned to each interface 
>>> connected to the multihomed site.
>>>
>>
>> I do not think that will be the case of the roaming laptop case, i.e.
>> the GPRS, WLAN and fixed ethernet links all give out exctly one
>> IP-address to the connected interface, and you are only supposed to
>> use that IP-address through that interface to which it was given to.
>>
> In IPv6 it is indeed possible that you have multiple
> addresses and prefixes on a single interface. Then the
> issues that Marcelo refers to become possible. But
> from what I understand we can deal with that in an
> orthogonal way, i.e., this is an issue in MOBIKE usage,
> in SHIM6 usage, and even when no multihoming protocol
> is used at all.
>

right, but supporting unidirectional paths in the protocol makes the 
protocol to perform better in such scenarios
I mean, as i see it, or you assume that there is something that will 
take care of ingress filtering compatibility, in which case, supporting 
unidirectional connectivity support doesn't brings you much, or you 
don't assume some ingress filtering compatibility mechanism and then 
supporting unidirectional paths does buy you some extra performance. 
but the mobike protocol doesn't seems to do none of them afaict (or at 
least it doesn't state anything about this)
regards, marcelo


> --Jari
>