Questions tagged [circuit]

A Tor circuit is a private network pathway built incrementally as a series of encrypted connections through relays on the network.

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Tor failed to establish a Tor network connection [duplicate]

Please help me! Tor gets as far as establishing a circuit, then fails. It says: Tor failed to establish a Tor network connection. Establishing a Tor circuit failed (connection timeout - 161.53.160....
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2k views

Tor circuit display in Tor Browser - how can it?

If all the nodes in a Tor circuit aren't supposed to know about each other, how can the Tor Browser display the whole circuit? If it knows all the addresses in the chain, can't someone else pull that ...
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Is a Tor or cloudflare update the reason I suddenly getting cloudflared to death?

All of a sudden almost every site, including this one cloudflares me, some I have to refresh the Tor circuit over 50 times to get it to work, and then it it dies within a few mins. The thing is, this ...
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Why does Torbutton circuit view not consistently show the correct exit node?

Making an arbitrary number of new identities will eventually cause the circuit view in Torbutton to show the wrong exit node. This is a screenshot I took to show the problem. Notice Torbutton thinks ...
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I'm building lot's of circuits. What could cause this?

I run a relay. It has a SocksPort listening, but I don’t use it as a client for anything at the moment. It also hosts a hidden service. From time to time I get warnings like this: [warn] Your ...
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Can somebody force my Tor circuits to always start from his “guard node”, to access my traffic?

The first node after "my browser" is always the same. I am worried to see that even when asking for "new identity" or "new circuit", it restarts always by the same IP address in France. I have no ...
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2answers
54 views

What prevents CircID collision from happening?

When a Tor OP wants to extend a circuit, it sends a relay extend cell to the last node on it. This node then sends CREATE cell to the desired destination node, choosing a new CircID (used to identify ...
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195 views

Tor circuit chaining

Is it possible to use multiple tor circuits chained together? tor_circuit --> tor_circuit --> ... --> tor_circuit I know of a solution on windows using tortilla for windows that allows ...
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761 views

Displaying the Tor circuit via terminal

I'm using Debian 7 server. I will try to use proxychains. Is it possible to see the current Tor circuit (IP addresses) via terminal?
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How does Tor client build circuits when using a bridge?

When using a bridge, if my own Tor client builds the circuit, how does it know relays IP addresses (middle and exit IP addresses and their public keys) ? Does it take them from the bridge?
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198 views

Login to site.com, request “New Tor circuit for this site”, site.com still recognizes original login

Using TorBrowser, login with username and password on site.com (e.g., google, amazon, etc.), then ask TorBrowser for "New Tor circuit for this site." Why does site.com (sometimes) recognize this "new ...
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Can Tor's IP sharing be dangerous?

I am novice to Tor, but before using it I have gone through lot of websites. An article explained that Tor is dangerous the following reason: Consider an IP 1.2.2.2 which was assigned by Tor to user ...
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7k views

Tor Browser Bundle (TBB) new circuit versus new identity

I have experimented in the Tor Browser Bundle with the Tor Button's choices of "new circuit for this site" and "new identity". "New circuit" appears to affects only the open tab and creates a new ...
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218 views

How does Tor protect against flooding with artificially long circuits

Since the path and the length of a circuit can be chosen by a modified client an attacker could make it arbitrarily long and thus multiply the the impact of his traffic on the network by the amount of ...
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745 views

Suddenly my Tor hidden service isn't available

I created a Tor hidden service (a server binded to localhost port and torrc config'd to use the 127.0.0.1 xxxx) for clients to connect to. It was working great for a month or so, and now no one can ...
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551 views

How does TOR extend circuit to a third node?

I am reading the Tor: The Second-Generation Onion Router article and my question is that how TOR extends circuit to a third node? On page 7 of the article,left column, it says: To extend the ...
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Orbot is able to open a circuit, but browser check still doesn't confirm using Tor

According to the Orbot Log the program was able to open a circuit. But if I run a browser check, it still tells me that I am not using tor. I also uses a bridge, but the result stays the same. How ...
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6k views

Is the Tor browser always using at Tor ciruit?

I'm using the Tor browser (4.5.3) and when I press the green onion I can see the current Tor circuit that's in use at the moment. Now, is the browser always using a Tor circuit? Because sometimes when ...
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446 views

First Circuit Server Constant (New Identity) [duplicate]

No matter what I am trying, I can't change the first server in the circuit. Neither "New Identity" nor "New Circuit" or closing the browser will change it. I tried two different tor instances from ...
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Stem: How to get current in-use circuit?

I am able to list the circuits, but for some reason I'm never able to quite get a circuit alone consistently, there always appears to be many of them with state BUILT. This is especially true after I ...
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1k views

Programmatically changing Tor circuit

Is it possible to change Tor circuit using Javascript or configuring it to change Tor circuit in a certain interval?
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97 views

Why exactly is it not recommended to exclude relays?

I'm doing some research on Tor for a paper and stumbled upon this section on the Tor FAQ page, where it says how to choose or exclude certain nodes from your circuit. Below it says that it is not ...
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692 views

How to assign a stream to a circuit?

I have a Python script that is configured to connect to 4 different onion services (call them a, b, c, d), and return a value on a page. I'd like to ensure that I create separate circuits to connect ...
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How to prevent a circuit from changing between browser tabs?

In the current versions of Tor (4.5.1) every time a new tab is opened a new circuit is made - causing the ip to change. Consider the following scenarion: User logs into firstsite.com - session/...
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382 views

What circuits connect to the introduction and rendezvous point?

If accessing an onion service, how much commonality is there between the circuits that connect to the introduction point, the rendezvous point, and the exit node for non-onion service usage? I ...
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467 views

Why does this website is taking infinite time to load on Tor Broswer?

http://www.hao123.com/ The above mentioned website is taking infinite time to load in the Tor Browser. However if I open it without using Tor, it loads instantaneously. Any guesses why this behavior? ...
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529 views

How can I randomize the entry guard?

Tor is moving to a single entry node implementation (#11480). I think that's because it's statistically feasible for an adversary to deploy entry and exit nodes and perform a correlation attack by ...
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243 views

return path selection

i could not find a detailed explanation about how return path is defined. It is mentioned somewhere that exit node encrypts data multiple times. But how dose exit node gets the public key of first ...
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97 views

How feasible is that Directories grant you only compromised nodes to build the circuit from?

I asked this question about Tor and how secure are the first steps before the circuit is made (the guy who answered me, lead me to this site which i didn't know). Please correct me if I'm wrong (or ...
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1k views

Accessing Tor hidden services over a single hop circuit

I will presage the expected warnings before posting my question: I fully understand the security risks involved using single hops, however, with regards to my goals I have zero need for anonymity. I ...
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72 views

Path selection constraints not working as expected

From Section 2.2 of the path specification We do not choose any router in the same family as another in the same path. (Two routers are in the same family if each one lists the other in ...
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190 views

Which protocol has the better perfomance TAP or NTor

Just wondering, which protocol, TAP or NTor is less computationally intensive for a relay to process and why ? Thanks Rich
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18k views

How to change the entry node?

When Tor changes circuit it only changes middle node and exit node, the entry node stays the same since the Tor started, so I guess the entry node is limiting the traffic if you make too much traffic,...
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197 views

Why Atlas does not show all exit nodes Tor connect to simultaneously?

At times Tor connect to several circuits (and different exit nodes) to support multiple protocol simultaneously, In these cases, why Atlas does not show all exit nodes Tor connect to simultaneously? ...
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Weighted Bandwidth for Rendezvous Points

I wonder how the WeightedBandwidth for Rendezvous Points (RPs) is calculated. I know, its a bit complicated, because RPs are chosen in a lot of different ways: Tor tries to reuse existing circuit ...
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55 views

Probability by bandwidth: Using multiple or one Relay with equal total Bandwidth

Is there a higher probability, if an attacker is using one OR of bandwidth 5 MB/s than 5 ORs with each 1 MB/s? If you calculate the probability of picking a certain OR, you can use the weighted ...
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1answer
125 views

Exit node of circuit for requesting hidden service descriptor

When we need a hidden service descriptor, we have to build a circuit to access a hidden service directory. Is this circuit a normal circuit, or is the third hop of the circuit an exit node?
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446 views

Orbot, Tor identities and changing network connectivity paths

I've been thinking about a potential vulnerability that in certain cases may make it possible to identify a Tor client. Say a malicious entry node establishes a connection with an Orbot client. This ...
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501 views

Circuit Build Times in Tor

Why does Tor save the circuit build times and what does it want to learn out of them? Tor loads the circuit build times from a file at the beginning. I do not know why it needs them.
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339 views

External IP Address Changed - Tor has determined your relay's public IP address is

When I restart my PC I get this........ "[Wed 10. Sep 16:04:15 2014] External IP Address Changed - Tor has determined your relay's public IP address is currently 90.244.. If that is not correct, ...
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Can intermediary nodes learn the length of a circuit?

This should be impossible because of the layered encryption, but some documentation suggests that this can somehow be done. From Section 5.6 [1] of tor's specification When speaking v2 of the link ...
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136 views

Relay streaming a large file

I wanted to download a file of considerable size, let us say 10GB and I sent the GET request to a web server to download that file. I then would get downloaded through the Tor network, through the ...
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597 views

What happens when Tor always chooses the same path?

What weakness would this expose? It doesn't seem obvious that there would be any apparent way to attack.
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799 views

Multiple Tor processes to separate client traffic to improve anonymity?

Say you had multiple online accounts of all kinds and you route them all through a local Tor daemon on your computer using SOCKS[45]. I'm wondering if running multiple separate Tor instances that ...
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1answer
2k views

What is the relationship between guard nodes and bridges?

What is the relationship between guard nodes and bridges when building Tor circuits? If I connect to the Tor network through a bridge, is the bridge acting as my guard node (such that there are still ...
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40 views

Are individual circuits exposed in inter-relay traffic?

There are thousands of Tor relays. And so it's arguably impractical for each relay to maintain persistent connections with all of the others, even without padding traffic. At the other extreme, a ...
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107 views

There is a good argument for making the number of hops in a path unpredictable, Is there a research paper that tells us what to do?

The following is a quote from Tor FAQ: There is a good argument for making the number of hops in a path unpredictable [Thus Random]. For example, somebody who happens to control the last two hops ...
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Tor and circuits

I'm running Tor and need to know an IP address of my latest node. There is my config: # This file was generated by Tor; if you edit it, comments will not be preserved # The old torrc file was ...
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Why is the HS not using the RP as the Endpoint of its rendezvous circuit?

Im asking myself, why the rendezvous circuit has a minimum length of 6 hops, which are: Client -> (a1) -> (a2) -> (RP) <- (b3) <- (b2) <- (b1) <- HS The Client is using RP ...
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803 views

What do these Tor warnings imply?

The Following warnings have been observed during Tor operations. [Warning] onion_skin_client_handshake failed. [Warning] circuit_finish_handshake failed.* [Warning] connection_edge_process_relay_cell ...