Re: [v6ops] IPv6 EHs Packet Drops (Fwd: New Version Notification for draft-gont-v6ops-ipv6-ehs-packet-drops-02.txt)

["Ackermann, Michael" <[e-mail]>]

Regards to your statement ---

", is to define a new extension header that just 
> contains a sequence number."

Please see     https://tools.ietf.org/html/draft-ietf-ippm-6man-pdm-option-01

Which already proposes a sequence number, in a DOH extension header,   for diagnostic and performance monitoring purposes.  

Thanks

Mike



-----Original Message-----
From: v6ops [mailto:[e-mail]] On Behalf Of Joe Touch
Sent: Tuesday, February 09, 2016 11:57 AM
To: Philip Homburg <[e-mail]>; [e-mail]
Cc: Fernando Gont <[e-mail]>
Subject: Re: [v6ops] IPv6 EHs Packet Drops (Fwd: New Version Notification for draft-gont-v6ops-ipv6-ehs-packet-drops-02.txt)



On 2/9/2016 7:58 AM, Philip Homburg wrote:
> It seems that in practice we have defined 'The Internet' as a network 
> that does not reorder packets.
> 
> Then I was thinking about IPSEC tunnels, and one way to restore that 
> property for an IPSEC tunnel, if statistical multiplexing is going on 
> some in the network, is to define a new extension header that just 
> contains a sequence number. The sending side just increments the 
> number for each packet that goes out. The receiving side has some heuristics how long to wait to reorder packets.

IP (and IP forwarding) doesn't care about order.

The only time order matters is when an intermediate device tries to act like an end system (inspecting L4) but doesn't want to *do the work* of being an end system (by reordering or reassembling).

> You could do the same thing in TCP, but it might be easier to write it 
> as a separate layer to avoid modifiying TCP stacks.

TCP already reorders packets. Modern extensions handle out-of-order arrivals much better than older versions.

...
> The main idea is that if a load balancer cannot handle an EH, it 
> should just use statistical multiplexing and let the hosts deal with the result.

+1

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