#33222: Prop 311: 4.2. Checking IPv6 ORPort Reachability ------------------------------+-------------------------------- Reporter: teor | Owner: teor Type: defect | Status: assigned Priority: Medium | Milestone: Tor: 0.4.4.x-final Component: Core Tor/Tor | Version: Severity: Normal | Keywords: ipv6, prop311 Actual Points: | Parent ID: #33221 Points: 6 | Reviewer: Sponsor: | ------------------------------+-------------------------------- 4.2. Checking IPv6 ORPort Reachability
We propose that testing relays (and bridges) select some IPv6 extend- capable relays for their reachability circuits, and include their own IPv4 and IPv6 ORPorts in the final extend cells on those circuits. The final extending relay will extend to the testing relay: * using an existing authenticated connection to the testing relay (which may be over IPv4 or IPv6), or * over a new connection via the IPv4 or IPv6 ORPort in the extend cell. The testing relay will confirm that test circuits can extend to both its IPv4 and IPv6 ORPorts. 4.2.1. Selecting the Final Extending Relay IPv6 ORPort reachability checks require an IPv6 extend-capable relay as the second-last hop of reachability circuits. (The testing relay is the last hop.) IPv6-extend capable relays must have: * Relay subprotocol version 3 (or later), and * an IPv6 ORPort. (See section 5.1 for the definition of Relay subprotocol version 3.) The other relays in the path do not require any particular protocol versions. 4.2.2. Extending from the Second-Last Hop IPv6 ORPort reachability circuits should put the IPv4 and IPv6 ORPorts in the extend cell for the final extend in reachability circuits. Supplying both ORPorts makes these extend cells indistinguishable from future client extend cells. If reachability succeeds, the testing relay (or bridge) will accept the final extend on one of its ORPorts, selected at random by the extending relay (see section 3.2.1). 4.2.3. Separate IPv4 and IPv6 Reachability Flags Testing relays (and bridges) will record reachability separately for IPv4 and IPv6 ORPorts, based on the ORPort that the test circuit was received on. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33222> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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