Right, there is no way to try to simultaneously connect using ipv4 and ipv6, apparently. Also, the problem with setting the registry TcpConnectMaxRetries registry entry is that it also affects retries wen no ACK is received. This is probably something one doesn't want to mess with.
Okay, so do we want to bug MS about this? Clearly it is a performance problem when implementing dual stack clients. K -----Original Message----- From: "Martin v. Löwis" [mailto:mar...@v.loewis.de] Sent: 15. janúar 2009 00:07 To: Kristján Valur Jónsson Cc: python-dev@python.org Subject: Re: [Python-Dev] socket.create_connection slow > And Microsoft, realizing their problem , came up with this: > http://msdn.microsoft.com/en-us/library/bb513665(VS.85).aspx Dual-stacked sockets are a useful thing to have (so useful that Linux made them the default, despite that the RFC says that the default should be IPV6_V6ONLY). The Python library should make all server sockets dual-stacked if possible. Unfortunately: - the socket option is not available on all systems, in particular, it is not available on Windows XP (you need Vista) - you'll see the 1s delay on the client side if the server is not dual-stacked, so if the server "misbehaves", the client has to suffer. Regards, Martin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
