On 4/28/2015 11:24 AM, Lucy yong wrote:
> Hi Fred,
>
> GUE uses UDP port to indicate GUE encapsulation as UDP payload and
> GUE has prototype field to indicate the payload type. Making an
> exception and requiring inspection of first nibble at end points is
> not a good idea.
>
> I don't like the combination approach.
If you examine the first 4-bits of the IP field, you will:
- work with any IP version in the future
- no need new GUE codepoints for new IP versions
If you keep duplicate information in the header, you will:
- need to explain what you do when the two fields
do not match
- still need to check the first 4 bits of the IP
header anyway
- still need to check some bits in the GUE header
There's no downside to using the existing IP version field here, and
there are many downsides to using a duplicate field.
Joe
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