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List:       ipng
Subject:    (IPng 332) Re: multi-homed hosts
From:       bound () zk3 ! dec ! com
Date:       1995-06-29 13:20:37
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Dan,

>The only additional complexity with this is a few more checks at the host
>and that only happening on the first packet to a destination (like a TCP
>SYN, for example).  This way, no interfaces are changed in the middle of
>communication, etc.  (Which is what I believe was one of KRE's points.)

Per addrconf and the next version of DHCPv6 too existing, communications
will not be broken ever if a deprecated lifetime is used.  We can
implement this pretty easy by adding a reference_counter in ifaddr
structures to see the variant states an address can be in at the
transport.  This way we can elegantly migrate interfaces from an old
address to a new one.

>I mean check the ON-LINK prefixes only.  The rationale behind it being,
>it might not be optimal, but it will be closer than blindly picking the
>default router.  It is also relatively straightforward to implement.

>With this simple addition, I think we can avoid having to bloat the
>relatively clean neighbor discovery, or create a new lightweight routing
>protocol.  We don't have to change documents, add new complexity, etc.

I agree but I don't think we need to put this in ND I think the issue is
if a host is multihomed and forwards packets does that break our model
of what a host is as specified in Internet Protocol version 6 spec?

Personally I think an implementation should be able to forward packets
in this manner, but I don't think we need ND to say anything we can
implement what you outlined without any changes or words to ND.  But not
if I am a host as its defined right now.

I still think Joel was asking another question?

thanks
/jim

/jim
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