[tor-dev] Draft proposal -- no number yet: How to safely drop support for old clients.

Tim Wilson-Brown - teor teor2345 at gmail.com
Wed Sep 30 13:55:25 UTC 2015

> On 30 Sep 2015, at 12:01, Nick Mathewson <nickm at torproject.org> wrote:
> [This isn't done yet, but I've shown it to enough people that I should
> share it with the list.]
> 1. Introduction and background
> 1.1. Motivation
>   Frequently, we find that very old versions of Tor should no longer be
>   supported on the network.  To remove relays is easy enough: we
>   simply update the directory authorities to stop listing them.
>   But to disable clients is harder.  We can do as we did with v1
>   directories in Tor, and make them know about no relays
>   at all.
>   ...
> 1.2. History
>   Early versions of Tor checked the recommended-versions field in the
>   directory to see whether they should keep running.  If they didn't
>   recognize

their own version, they would stop (what?).

> ...
> 3.2. Disabling versions prior to
>   Starting in version Tor, we implemented proposal 214.
>   This proposal added a new link protocol, version 4.  Earlier version
>   of Tor never support it; newer versions of Tor always advertise their
>   support for it.
>   We could treat the presence of any link protocol of version 4 or
>   later as indicating the presence of  Upon receiving a
version 3 or earlier as indicating the presence of a version less than
>   connection from such a version, we could throttle the bytes we give
>   it, drop its circuits, or stop reading.
>   [TODO: which?]


Tim Wilson-Brown (teor)

teor2345 at gmail dot com
PGP 968F094B

teor at blah dot im
OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F

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