Re: [tor-dev] how to simulate TOR network through chutney?

On Sat, Jan 10, 2015 at 1:13 PM, teor <teor2345@xxxxxxxxx> wrote:

On 10 Jan 2015, at 09:55 , teor <teor2345@xxxxxxxxx> wrote:

>> Date: Tue, 6 Jan 2015 20:13:51 +0100
>> From: Mohiuddin Ebna Kawsar <mohiuddin.kawsar@xxxxxxxxx>
>> To: tor-dev@xxxxxxxxxxxxxxxxxxxx, matthias.wuebbeling@xxxxxxxxxxxxxx
>> Subject: [tor-dev] how to simulate TOR network through chutney?
>>
>> HI,
>>
>> IÂ need to simulate TOR network in minimal case [1 ENTRY,1 RELAY,1 EXIT]
>> node.
>> how can i do that use chutney? how to setup exit node onÂ my localhost and
>> how to make circuit with that exit node?
>>
>> following are my config file with generated (slightly modified) torc files
>
> Hi Mohiuddin,
>
> -- Minimum number of instances in a Tor network --
>
> Using 3 tor instances (that is, 2 authorities/relays/exits and 1 client) will never work, because the minimum number of tor relays/authorities/exits needed to create a path through the network is 3.
> Clients do not participate in any of the 3 positions in a path - they only initiate the path.
>
> The basic-min network is already a minimal tor network containing:
> 3 authorities (which also act as non-exit relays)
> 1 exit
> 1 client
> -----
> 5 tor instances

I forgot a simple, working config with 4 tor instances:

3 authorities / exits (authorities which also act as exit relays)
1 client
-----
4 tor instances

To get this working, change authority.tmpl as follows:

-----
${include:relay-non-exit.tmpl}
# For IPv4 exit capabilities
${include:exit-v4.i}
# For IPv6 exit capabilities
${include:exit-v6.i}

< the rest of authority.tmpl>
-----

>
> You could possibly reduce this to:
> 1 authority (which also acts as a non-exit relay)
> 1 non-exit relay
> 1 exit
> 1 client
> -----
> 4 tor instances
>
> I wouldn't recommend using 4 instances for two reasons:
> 1. The minimum number of authorities for a stable consensus is 3:
> A) more than one authority is needed to produce a genuine consensus;
> B) an odd number of authorities is needed to break ties.
>
> 2. The minimum number of authorities (or relays with AssumeReachable set) is 3, otherwise other relays or exits can't bootstrap. You can work around this by setting/uncommenting "AssumeReachable 1" in torrc_templates/common.i
> (It should be set to 1 by default.)
>
> I've never tested this, so I have no idea whether it will actually work.
> But feel free to try it, and let us know if it works (and please submit a new torrc_template file).
>
> Note: if you're using hidden services, you may need more than 3 authorities/relays/exits in the network. (I have not tested the minimum for hidden services.)
>
>
> -- What are you trying to simulate using chutney? --
>
> Do you need to test the entire bootstrap process? (30 seconds to start up)
> Or do you just want the network to be ready quickly? (10 seconds to start up)
>
> To get these bootstrap speeds, you will need to use tor version 0.2.6.2-alpha or later, and the latest chutney from git. Otherwise, you will be looking at 45 seconds or more to bootstrap.
>
> It will help if you indicate what you've modified in the torrc files, and why.
>
>>
>> i use basic-min for configure.
>> ############## basic-min##########################
>> Authority = Node(tag="a", authority=1, relay=1, torrc="authority.tmpl")
>> Relay = Node(tag="r", relay=1, torrc="relay.tmpl")
>> Client = Node(tag="c", torrc="client.tmpl")
>>
>> NODES = Authority.getN(1) + Relay.getN(1) + Client.getN(1)
>>
>> ConfigureNodes(NODES)
>>
> <snip>
>
> teor

teor

teor2345 at gmail dot com
pgp 0xABFED1AC
https://gist.github.com/teor2345/d033b8ce0a99adbc89c5

teor at blah dot im
OTR C3C57B23 349825DE 929A1DEF C3531C25 A32287ED

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