------------------------------Just to be REALLY clear - IANA has not allocated IPv6 address space to any Infiniband entities - so they are not Internet IPv6 addresses. GIDs are formatted like IPv6 addresses but in no sense should EVER be used at an IP layer 3 address.
Message: 2
Date: Wed, 29 Jun 2005 09:00:37 -0700
From: Roland Dreier <[EMAIL PROTECTED]>
Subject: Re: [openib-general] IP addressing on InfiniBand networks
To: Caitlin Bestler <[EMAIL PROTECTED]>
Cc: "Lentini, James" <[EMAIL PROTECTED]>, Christoph Hellwig
<[EMAIL PROTECTED]>, openib-general <openib-general@openib.org>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Caitlin> An assigned GID meets all of the requirements for an IA
Caitlin> Address. I think taking advantage of that existing
Caitlin> capability is just one of many options that can be done
Caitlin> by the IB CM rather than forcing IB specific changes up
Caitlin> to the application layer.
Just to be clear, the IBA spec is very clear that a GID _is_ an IPv6 address.
- R.
From an IPoIB stance - IB is just a very over engineered Layer 2 that has a singularly large MAC address.
From an IB ULP point of view - how you get to the layer 2 address that is needed to perform communications that do not include IP, it isn't a problem - but let me tell you.... The leadership of the IETF is scared of IB because of saying things IB GIDs _ARE_ IPv6 addresses.
Being the person who led the addressing definition for IB, I can state quite clearly that GID are NOT IPv6 addresses. They were intentionally defined to have a similar look-n-feel since they were derived in large part from Future I/O which had them as real IPv6 addresses. But again, they are NOT IPv6 addresses.
For IP over IB, it is unfortunate that we could not have simply used a raw datagram service as that would have made life very simple but we are in the state we are so that means there is a UD transport providing a layer 2 Ethernet equivalent of functionality.
Mike
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