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Re: [IPsec] Questions for draft-ponchon-ipsecme-anti-replay-subspaces

Paul Wouters <paul@nohats.ca> Mon, 14 August 2023 18:45 UTC

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Date: Mon, 14 Aug 2023 14:45:28 -0400
From: Paul Wouters <paul@nohats.ca>
To: Aseem Choudhary <achoudhary=40aviatrix.com@dmarc.ietf.org>
cc: "Paul Ponchon (pponchon)" <pponchon@cisco.com>, "draft-ponchon-ipsecme-anti-replay-subspaces.authors@ietf.org" <draft-ponchon-ipsecme-anti-replay-subspaces.authors@ietf.org>, "ipsec@ietf.org" <ipsec@ietf.org>
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Subject: Re: [IPsec] Questions for draft-ponchon-ipsecme-anti-replay-subspaces
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On Mon, 14 Aug 2023, Aseem Choudhary wrote:

> 1. Yes, you're correct there is still reordering potentially happening between the endpoints of the tunnel. However, the intention
> behind using the subspace is to limit the potential reordering of packets at the tunnel endpoints. By assigning packets to specific
> subspaces based on factors such as CPU core or QoS, the aim is to manage and mitigate the reordering within each subspace, thereby
> improving the utilisation of multiple cores and QoS classes at the endpoint. The reordering happening in between the endpoint is
> less easily controllable and just like with using an SA today, would be handled by the replay window of each subspaces but they
> don’t need to be very big.

But if you already bind subspaces to a CPU/core, why not just a whole IPsec SA per core :-)

Paul

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