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Document IPv6/IPv4 binding on standalone. (#5983)

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This commit is contained in:
Kevin Le
2018-05-14 16:15:02 -04:00
committed by Brad Warren
parent 94829e35be
commit c1471fe873
1 changed files with 8 additions and 0 deletions
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docs/using.rst
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@@ -170,6 +170,14 @@ one of the options shown below on the command line.
It must still be possible for your machine to accept inbound connections from
the Internet on the specified port using each requested domain name.
By default, Certbot first attempts to bind to the port for all interfaces using
IPv6 and then bind to that port using IPv4; Certbot continues so long as at
least one bind succeeds. On most Linux systems, IPv4 traffic will be routed to
the bound IPv6 port and the failure during the second bind is expected.
Use ``--<challenge-type>-address`` to explicitly tell Certbot which interface
(and protocol) to bind.
.. note:: The ``--standalone-supported-challenges`` option has been
deprecated since ``certbot`` version 0.9.0.