Hi all,
I wanted to learn more about how Tor circuit IDs work. Correct me if I'm wrong, but this is my current understanding:
Each hop along the Tor network has its own circuit ID number. (No universal circuit ID number is used to identify a ip-to-ip stream of traffic). How are the circuit ID numbers determined at each hop? What generates the circuit ID number given to a packet?
Thanks!
Hi Gabbi,
Gabbi Fisher:
Hi all,
I wanted to learn more about how Tor circuit IDs work. Correct me if I'm wrong, but this is my current understanding:
Each hop along the Tor network has its own circuit ID number. (No universal circuit ID number is used to identify a ip-to-ip stream of traffic). How are the circuit ID numbers determined at each hop? What generates the circuit ID number given to a packet?
maybe the tor-spec can help here: https://gitweb.torproject.org/torspec.git/tree/tor-spec.txt#n937
if it doesn't, the tor-dev ML might be a better place.
kind regards, nusenu
Hi,
For those reading along, this conversation started on tor-onions: https://lists.torproject.org/pipermail/tor-onions/2018-September/date.html
On 10 Oct 2018, at 08:24, nusenu nusenu-lists@riseup.net wrote:
Gabbi Fisher:
I wanted to learn more about how Tor circuit IDs work. Correct me if I'm wrong, but this is my current understanding:
Each hop along the Tor network has its own circuit ID number. (No universal circuit ID number is used to identify a ip-to-ip stream of traffic). How are the circuit ID numbers determined at each hop?
Circuit IDs are generated at random, with range restrictions depending on the negotiated link protocol version. See the spec for details.
What generates the circuit ID number given to a packet?
The initiating client or relay includes a random ID in the CREATE cell. Subsequent cells in both directions on that circuit are given the same ID.
maybe the tor-spec can help here: https://gitweb.torproject.org/torspec.git/tree/tor-spec.txt#n937
if it doesn't, the tor-dev ML might be a better place.
+1
T
tor-relays@lists.torproject.org
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Gabbi Fisher -
nusenu -
teor