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628bc3e5a1
Some l2tp providers will use 1701 as origin port and open several tunnels for the same origin and target. On the Linux side, this may mean opening several sockets, but then trafic will go to only one of them, losing the trafic for the tunnel of the other socket (or leaving it up to userland, consuming a lot of cpu%). This can also happen when the l2tp provider uses a cluster, and load-balancing happens to migrate from one origin IP to another one, for which a socket was already established. Managing reassigning tunnels from one socket to another would be very hairy for userland. Lastly, as documented in l2tpconfig(1), as client it may be necessary to use 1701 as origin port for odd firewalls reasons, which could prevent from establishing several tunnels to a l2tp server, for the same reason: trafic would get only on one of the two sockets. With the V2 protocol it is however easy to route trafic to the proper tunnel, by looking up the tunnel number in the network namespace. This fixes the three cases altogether. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Link: https://lore.kernel.org/r/20240506215336.1470009-1-samuel.thibault@ens-lyon.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.