[tor-relays] Bridge Usage and Setup

[Steve Snyder]

>2) Testing
>How do I (easily) confirm my bridge is correctly configured?
>Especially if I don't have an IPv6 connection for TBB?

FYI, you can get up to 5 IPv6 addresses for free from Hurricane Electric:

    https://tunnelbroker.net/

That lets you tunnel IPv6 traffic when your ISP only offers IPv4 networking, allowing you to connect to your IPv6 bridge address.


On Monday, June 1, 2015 12:34pm, "Tom Ritter" <tom at ritter.vg> said:

> Earlier this month I set up an obfs3/obfs4 bridge that (as far as I
> can tell) has never been used. Is this normal?  My bridge is at
> https://atlas.torproject.org/#details/C184F644B9D39B26647779282003ACAF59E8028A
> 
> 
> During this exercise I ran across a few pain points for setting up a
> bridge.  Maybe I completely ignored some existing resource for this,
> but the bottom of https://www.torproject.org/docs/bridges is out of
> date, BridgeDB doesn't have a link anywhere, and trac's search isn't
> that good but I couldn't find anything on that either.
> 
> 1) Setup
> I followed
> https://gitweb.torproject.org/pluggable-transports/obfs4.git/tree/README.md
> to set up the obfs3/obfs4
> As good as this is, it would be great if it included a minimal and
> complete torrc for an obfs4 bridge, and perhaps also for an
> obfs3/obfs4 bridge and an IPv6 setup.  My torrc is
> 
> SocksPort 0
> ControlPort 9051
> HashedControlPassword ...
> CookieAuthentication 1
> ORPort 9001
> ORPort [<public ipv6 addr>]:9001
> BridgeRelay 1
> ExtORPort auto
> ServerTransportPlugin obfs3,obfs4 exec /usr/local/bin/obfs4proxy
> ServerTransportListenAddr obfs3 [::]:80
> ServerTransportListenAddr obfs4 [::]:443
> 
> 2) Testing
> How do I (easily) confirm my bridge is correctly configured?
> Especially if I don't have an IPv6 connection for TBB?
> 
> netstat seems to say that things are good.  The tcp6 connections on 80
> and 443 also apply to ipv4 though; right?
> 
> $ netstat -lpn
> tcp        0      0 127.0.0.1:9051          0.0.0.0:*
> LISTEN      479/tor
> tcp        0      0 0.0.0.0:9001            0.0.0.0:*
> LISTEN      479/tor
> tcp        0      0 127.0.0.1:55346         0.0.0.0:*
> LISTEN      479/tor
> tcp6       0      0 :::443                  :::*
> LISTEN      480/obfs4proxy
> tcp6       0      0 <public ipv6 addr> :::*                    LISTEN
>     479/tor
> tcp6       0      0 :::80                   :::*
> LISTEN      480/obfs4proxy
> 
> I can put my bridge line into TBB and try and use it for obfs4; seems
> to work. But actually finding that bridge line wasn't straightforward
> (cat /var/lib/tor/pt_state/obfs4_bridgeline.txt and then edit the
> fields, right?) And it doesn't help for obfs3.
> 
> Some external validation would be nice.
> 
> 3) Usage
> Can do I figure out if my bridge is being used?  I've identified the following:
> 
> $  cat /var/lib/tor/stats/bridge-stats
> bridge-stats-end 2015-05-31 18:58:43 (86400 s)
> bridge-ips
> bridge-ip-versions v4=0,v6=0
> bridge-ip-transports
> 
> $ zgrep unique /var/log/tor/*
> (a bunch of lines of "0 unique clients")
> 
> Atlas graphs, showing virtually no traffic
> 
> 
> 
> 
> I feel like #2 might be addressed by Weather (if it was working), but
> all of these might be a good subject for a wiki page on how to run a
> bridge, if my understanding of everything is correct.
> 
> -tom
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