Re: [Int-area] Fwd: New Version Notification for draft-herbert-ipv4-udpencap-eh-00.txt

[Tom Herbert <[e-mail]>]

On Fri, Mar 8, 2019 at 9:42 AM Joe Touch <[e-mail]> wrote:
>
>
> On 3/8/2019 9:33 AM, Tom Herbert wrote:
> > UDP fragmentation would only with UDP, it doesn't help any other
> > transport protovcol.
>
> Stream transports already do this for the entire stream.
>
> The only other exception might be DCCP - I'd have to check that.
>
IPsec, GRE, MPLS, Ether/IP, IPIP, etc. The whole point of having
things like fragmentation into the network layer is that it applies to
all protocols and we don't need to "reinvent the wheel" every time a
new protocol comes along.

> >  Also, I don't understand how the fragmentation
> > extension header, which has been defined for over twenty years and is
> > now part of an Internet standard, can be called "obscured layering".
>
> Not IPv4; the one where the network EHs would be buried after a GUE
> transport header.

If by "network EHs" you mean Hop-by-Hop options, the draft specifies
how intermediate nodes can parse them in the GUE payload, and a magic
number is used to ensure with high probability that a middlebox is
indeed inspecting a GUE packet. Also, there is no requirement that any
intermediate nodes must process IPv4 Hop-by-Hop options.

Tom

>
> Joe
>
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