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vNEXT

v0.4.0, 2023-Aug-19

Broker changes:

  • The following Linux kernel versions are supported: >= 5.10.152, 5.15.76, 6.0.6, 6.1+.
  • Improve documentation and automated checks.
  • Python 3 support. Python 2 is no longer supported. NOTE: If you are running the broker in a Python virtualenv you will have to rebuild the virtualenv using a Python 3 interpreter. This can be achieved by deleting the old virtualenv folder and recreating it. For recreating the virtualenv you can refer to the "Installation" section of the broker installation chapter in the Tunneldigger documentation.
  • Remove NAT-based handling of many client tunnels on the same server port. The broker now relies on the kernel properly distinguishing those UDP sockets.
  • Remove dependency on Netfilter.
  • Fix compatibility with new Linux kernels on the broker side: New kernels force the l2tpv3 session ID to be unique system-wide, while old tunneldigger clients have a hard-coded ID of 1 for both ends of the tunnel. When a new client talks to a new broker, they will instead use a unique ID. Moreover, when the broker detects that it runs on an affected kernel, it reports maximal usage to old clients -- so if the client does usage-based selection, it will pick another broker.
  • Improve PMTU discovery to complete more quickly after tunnel creation.
  • More session and broker information is available for the hooks.
  • Make logging more detailed and more consistent.
  • l2tp_broker.cfg confguration file changes:
    • Add option connection_rate_limit to configure the delay between two clients connecting. Default is 10 (seconds), which is the limit applied by previous versions. Valid values include whole seconds (10) or fractions of a second (0.2). A value of 0 disables this feature. This is applied per broker port.
    • Add options connection_rate_limit_per_ip_count and connection_rate_limit_per_ip_time to configure a connection rate limit per client IP address. If either value is 0, the functionality is disabled. The default values are 0. This is applied per broker port.
    • Add hook broker.connection-rate-limit which is called when the connection rate per IP address limit is exceeded.
    • Add option pmtu, defaults to 0 (auto-discovery). If set to a non-zero value, this disables PMTU discovery and replying to client's PMTU discovery probes.
    • Remove option filename. All log message are sent to STDOUT or STDERR
    • Remove option port_base. No longer needed without the NAT-based approach
    • Remove option namespace. No longer needed without the NAT-based approach
    • Remove option check_modules. No longer implemented since v0.2.0

Client changes:

  • Add cmake build system.
  • Improve client behavior on broker failure: when a connection to a broker fails, the client prefers other brokers for the reconnects.
  • Add support for the protocol extensions that ensure unique session IDs on the broker side.
  • Decrease some reconnect timeouts.
  • Replace libnl-1 with libnl-3.

v0.3.0, 2017-Apr-02

  • Fixed double command bug in traffic control code.
  • Added optional broker selection based on usage.
  • Fixed off-by-one error in PREPARE package.
  • Added tests.
  • Added fq_codel tc rule to help alleviate buffer bloat.
  • Added new CFFI-based conntrack bindings.
  • Broker can now be installed as a Python package via setup.py. Due to this change it is now run as python -m tunneldigger_broker.main l2tp_broker.cfg after installation.

v0.2.0, 2015-Dec-24

  • Broker rewrite so that it can run on OpenWrt. The broker now enforces a 10s delay between two clients connecting. Support for several config options got dropped: max_cookies, tunnel_timeout, pmtu_discovery, check_modules, filename. Hooks run asynchronously. In particular, the pre-down hook is not guaranteed to complete before the tunnel is shut down.
  • Broker is now run as python -m broker.main l2tp_broker.cfg from the repository directory.

v0.1.0, 2015-Dec-16

  • Version with broker which does not run on OpenWrt.