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Re: another padding question ...
At 05:40 PM 5/29/97 -0400, Stephen Kent wrote:
>Bill,
>
> Thanks for the note. I'm not completely clear about the alignment
>requirement in the IPv6 context, and I think previous messages on this list
>suggest that the lack of clarity is widespread. Can you cite a specific
>IPv6 document that indicates the granularity at which 64-bit alignment must
>be maintained? We all understand the benefits of making the length of AH
>be zero mod 8, because it affects the alignment of the subsequent payload.
>However, in the ESP context, we're just talking about the position of the
>Auth Data field at the end of the packet. In some sense, it's just another
>field within ESP, and not all the ESP (or AH) fields can be 8-byte aligned.
RFC 1883. All IPv6 headers must be aligned on 8 byte boundaries.
What about encryption-less ESP? It would be foolish to make the
unencrypted data unaligned since that might force a data copy.
--
Matt Thomas Internet: matt.thomas@altavista-software.com
Internet Locksmith WWW URL: <coming eventually>
AltaVista Internet Software Disclaimer: This message reflects my own
Littleton, MA warped views, etc.
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