Re: [secdir] Secdir review of draft-ietf-opsawg-large-flow-load-balancing-11
Anoop Ghanwani <anoop@alumni.duke.edu> Sat, 14 June 2014 00:57 UTC
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From: Anoop Ghanwani <anoop@alumni.duke.edu>
To: Chris Inacio <inacio@cert.org>
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Cc: "draft-ietf-opsawg-large-flow-load-balancing.all@tools.ietf.org" <draft-ietf-opsawg-large-flow-load-balancing.all@tools.ietf.org>, "<iesg@ietf.org> IESG" <iesg@ietf.org>, "<secdir@ietf.org>" <secdir@ietf.org>
Subject: Re: [secdir] Secdir review of draft-ietf-opsawg-large-flow-load-balancing-11
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On Thu, May 1, 2014 at 9:25 PM, Chris Inacio <inacio@cert.org> wrote: > > > After reading Yoav's review, I was curious about this document. > > I would agree, roughly, with Yoav's comments on flow description. The > table at the beginning of the document (section 2) I feel would be much > better served with its Y axis labeled as bandwidth, and not flow scale. > We have modified the figure to show this as "Bandwidth. > > From a technical point of view, the only issue I have with the document is > that I feel that it misses how long lived flows are identified. I > understand the technical challenge that this presents: how should a middle > box understand/guess the intention of the end points for the duration of a > flow? There are likely to be some heuristics that could be > developed/included that would be likely to have some indication as to the > lifetime. For example, SSH keep alives with an otherwise minimal (smallest > of small) flow, or VPN identification. (Of course with VPN, the flow can > quickly switch from small to large and back to small.) Devices with > enhanced flow inspection can obviously label the traffic via inspection. > > I have 2 possible security considerations: > > Assuming the multi paths might lead to equal but diverse Internet > connections (anycast), does moving flows between paths provide an attacker > who has already penetrated an enterprise, the possibility to further evade > detection of border monitoring devices via flow flopping? Possibly evading > stateful inspection at the border? > This would be unlikely since the the packets still follow the same path that other regular packets follow. It is just pinned to a specific path rather than being allow to use whatever the hash algorithm dictates. > > And less likely: From a security point of view, sophisticated attackers, > persistent attackers, like to map their target environment (hosts and > network) before attempting their actual attack (DoS, exfiltration, > destruction, etc.). Does the movement of flows across otherwise redundant > links expose more network structure, especially with respect to traceroute > for an attacker. > The traceroute itself probably wouldn't be a large flow so that by itself shouldn't be affected by this scheme. We have augmented the security section based on comments from the GEN-ART review. Anoop
- [secdir] Secdir review of draft-ietf-opsawg-large… Yoav Nir
- Re: [secdir] Secdir review of draft-ietf-opsawg-l… Chris Inacio
- Re: [secdir] Secdir review of draft-ietf-opsawg-l… Anoop Ghanwani
- Re: [secdir] Secdir review of draft-ietf-opsawg-l… Anoop Ghanwani
- Re: [secdir] Secdir review of draft-ietf-opsawg-l… Yoav Nir