Thank you, Proposal 140 sounds perfect for what I need, that would minimize traffic quite a bit! I see some code for it at https://gitweb.torproject.org/tor.git/log/?qt=grep&q=prop140 , I'm guessing it's not complete yet.

Thanks again,
Razvan

On Sat, Apr 8, 2017 at 12:43 PM, nusenu <nusenu@openmailbox.org> wrote:
> I am working on a project to create very small Tor nodes on embedded
> devices connected over LTE or 3G.

since you are concerned about bw usage I assume you talk about tor
clients not relays.

> I have it working fine with OpenWRT and
> just 128MB of RAM, but the main issue is now the amount of data needed to
> download the consensus. The consensus files appear to be around 2.3MB at
> the moment and I think the default is to re-download every 3 hours, so
> that's 18.4MB/day or 552MB/month. Is there any way to reduce this while
> still maintaining good citizenship on the Tor network? Are there any
> recommended options for low-bandwidth nodes?

There is an ongoing effort to significantly reduce the bw overhead for
tor clients on metered networks.

Some improvements are supposed to land in tor 0.3.1.x.


Relevant proposals:

https://gitweb.torproject.org/torspec.git/tree/proposals/140-consensus-diffs.txt
https://gitweb.torproject.org/torspec.git/tree/proposals/274-rotate-onion-keys-less.txt
https://gitweb.torproject.org/torspec.git/tree/proposals/275-md-published-time-is-silly.txt
https://gitweb.torproject.org/torspec.git/tree/proposals/276-lower-bw-granularity.txt
https://gitweb.torproject.org/torspec.git/tree/proposals/277-detect-id-sharing.txt
https://gitweb.torproject.org/torspec.git/tree/proposals/278-directory-compression-scheme-negotiation.txt








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