Hi Tom,
On 18/09/16 20:00, Tom Henderson wrote:
> Stephen, thanks for your comments; replies inline below
>
> On 09/14/2016 04:25 AM, Stephen Farrell wrote:
>> Stephen Farrell has entered the following ballot position for
>> draft-ietf-hip-multihoming-11: No Objection
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>
>>
>> - I think section 6 ought note the privacy issue that
>> was relatively recently with WebRTC and ICE where a
>> client might not want all of it's IP addresses
>> exposed, as doing so could expose the fact that the
>> client e.g. is using Tor or another VPN service. The
>> issue being that in some locations, that information
>> may be quite sensitive. 4.2 notes this but in a quite
>> opaque way, ("may be held back") but it'd be better to
>> say some more. 5.1 is also relevant maybe in that it
>> says one "SHOULD avoid" sending info about virtual
>> interfaces. Anyway, I think it'd be good to add some
>> recognition of this privacy issue to section 6. I am
>> not arguing that this draft ought specify the one true
>> way to avoid this problem, but only that it be
>> recognised.
>
> Your comment led me to review this draft
>
> https://www.ietf.org/id/draft-ietf-rtcweb-ip-handling-01.txt
>
> which I would be inclined to cite, but I am not sure whether it will be put
> forward for publication soon (and therefore am not sure about citing it).
>
> The below might make a possible summary paragraph to add, however:
>
> "The exposure of all of a host's IP addresses through HIP
> multihoming extensions may raise privacy concerns. A host
> may be trying to hide its location in some contexts through
> the use of a VPN or other virtual interfaces. Similar
> privacy issues also arise in other frameworks such as WebRTC
> and are not specific to HIP. Implementations SHOULD provide
> a mechanism to allow the host administrator to block the
> exposure of selected addresses or address ranges."
> Looks good to me, thanks. >> >> - 4.11: what's the concern about anti-replay windows? >> I didn't get that fwiw, not sure if that just my >> relative ignorance of HIP or if more needs to be said >> in the document. > > It is explained in this sentence: > > "However, the use of different source > and destination addresses typically leads to different paths, with > different latencies in the network, and if packets were to arrive via > an arbitrary destination IP address (or path) for a given SPI, the > reordering due to different latencies may cause some packets to fall > outside of the ESP anti-replay window." Really? I'm surprised that that's at all likely. What size of window do folks tend to use? It must be small if path diversity has that effect. (Note: I'm not asking for a change to the text just wondering about it/educating myself:-) Cheers, S. > > Can you suggest changes or do you have a concern with what is stated? > > - Tom >
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