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
Right, there is no way to try to simultaneously connect using ipv4
and ipv6, apparently.
Ah, I see what you meant. No, this cannot work - what if you get
positive ACKs on both protocols?
Also, the problem with setting the registry TcpConnectMaxRetries
registry entry is that it also affects
Kristján Valur Jónsson kristjan at ccpgames.com writes:
On Vista, it will return an AF_INET6 entry before the
AF_INET one and try connection to that. This connect() attemt fails after
approximately one second, after which we proceed to do an immediately
successful connect() call to the
Hi,
Le Wednesday 14 January 2009 12:23:46 Kristján Valur Jónsson, vous avez
écrit :
socket.create_connection() trying to connect to (localhost, port)
(...)
return an AF_INET6 entry before the AF_INET one and try connection
to that. This connect() attemt fails after approximately one
=ccpgames@python.org] On Behalf Of
Antoine Pitrou
Sent: 14. janúar 2009 11:34
To: python-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
Kristján Valur Jónsson kristjan at ccpgames.com writes:
On Vista, it will return an AF_INET6 entry before the
AF_INET one and try
Victor Stinner wrote:
Hi,
Le Wednesday 14 January 2009 12:23:46 Kristján Valur Jónsson, vous avez
écrit :
socket.create_connection() trying to connect to (localhost, port)
(...)
return an AF_INET6 entry before the AF_INET one and try connection
to that. This connect() attemt fails after
Message-
From: python-dev-bounces+kristjan=ccpgames@python.org
[mailto:python-dev-bounces+kristjan=ccpgames@python.org] On Behalf Of
Victor Stinner
Sent: 14. janúar 2009 12:46
To: python-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
Hi,
Le Wednesday 14 January
AM
To: Victor Stinner; python-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
I have no idea why the connect refusal takes so long.
Maybe it's a vista thing?
from socket import *
socket(AF_INET6).connect((::1, 8080))
takes about one second to report active refusal. But so
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Michael Foord wrote:
Victor Stinner wrote:
Hi,
Le Wednesday 14 January 2009 12:23:46 Kristján Valur Jónsson, vous avez
écrit :
socket.create_connection() trying to connect to (localhost, port)
(...)
return an AF_INET6 entry before the
] On Behalf Of Billy
Earney
Sent: 14. janúar 2009 15:43
To: python-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
This may be way out on a limb, but could it be a reverse lookup issue?
___
Python-Dev mailing list
Python-Dev
On Vista, it will return an AF_INET6 entry before the AF_INET one and
try connection to that. This connect() attemt fails after approximately
one second, after which we proceed to do an immediately successful
connect() call to the AF_INET address.
Can you find out why it takes a second? That
Anyone that wants to use socket.create_connection() to create a
stream socket to a host whose name has both an Ipv4 and Ipv6 address.
Unless the host is listening on its Ipv6 port, an unsuccessful
connection attempt will first be made, taking approximately one
second.
Again, it is a bug in
It barfs on Macs as well: indeed, it is worse, because the connection
just fails there, rather than trying IPv6 and then falling back to IPv4.
That depends on the application. Some applications fall back (as they
should, if they added their support for IPv6 correctly), some don't.
For
I have no idea why the connect refusal takes so long.
Can you run wireshark, to find out whether it's sending out any
requests that don't get responses?
Could it be that your firewall is discarding the connection
request? (rather than sending an ICMP destination unreachable
back)
Anything
I have no idea why the connect refusal takes so long.
Maybe it's a vista thing?
I've looked into this further. It doesn't just happen for
localhost, but also for remote hosts, and not just for IPv6,
but also for IPv4, and not just for Vista, but also for XP.
The problem is this:
1. Vista sends
-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
I have no idea why the connect refusal takes so long.
Maybe it's a vista thing?
I've looked into this further. It doesn't just happen for
localhost, but also for remote hosts, and not just for IPv6,
but also for IPv4
Valur Jónsson
Sent: 14. janúar 2009 21:40
To: Martin v. Löwis
Cc: python-dev@python.org
Subject: Re: [Python-Dev] socket.create_connection slow
Aha, thanks, since my wireshark wasn't working.
I boiled a few pints of water (thanks, Google) and came up with this:
http://support.microsoft.com/kb/175523
Kristján Valur Jónsson wrote:
Aha, thanks, since my wireshark wasn't working.
I boiled a few pints of water (thanks, Google) and came up with this:
http://support.microsoft.com/kb/175523
Here is the summary:
Note that with other implementations of TCP, such as those commonly found in
many
Eric Smith wrote:
Kristján Valur Jónsson wrote:
Aha, thanks, since my wireshark wasn't working.
I boiled a few pints of water (thanks, Google) and came up with this:
http://support.microsoft.com/kb/175523
Here is the summary:
Note that with other implementations of TCP, such as those
Yet another undefined thing affecting us, Martin.
I think it's just another case of Microsoft says
it's undefined, even though the standards clearly specify
what the behavior must be, and Microsoft managed to implement
the behavior that not only violates the specification, but
also hurts users
Kristján Valur Jónsson wrote:
http://support.microsoft.com/kb/175523
Here is the summary:
Note that with other implementations of TCP, such as those commonly found in
many UNIX systems, the connect() fails immediately upon the receipt of the
first ACK/RST packet, resulting in the
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
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