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Date: Thu, 30 Dec 2010 12:30:23 -0800 (PST) From: David Miller <davem@...emloft.net> To: u.kleine-koenig@...gutronix.de Cc: netdev@...r.kernel.org Subject: Re: sysctls below net.ipv[46].conf.all not working as expected From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> Date: Wed, 29 Dec 2010 17:06:07 +0100 > I did the following: > > cassiopeia:~# sysctl net.ipv6.conf.all.use_tempaddr > net.ipv6.conf.all.use_tempaddr = 0 > > cassiopeia:~# sysctl net.ipv6.conf.eth0.use_tempaddr > net.ipv6.conf.eth0.use_tempaddr = 0 > > cassiopeia:~# sysctl -w net.ipv6.conf.all.use_tempaddr=1 > net.ipv6.conf.all.use_tempaddr = 1 > > cassiopeia:~# sysctl net.ipv6.conf.all.use_tempaddr > net.ipv6.conf.all.use_tempaddr = 1 > > cassiopeia:~# sysctl net.ipv6.conf.eth0.use_tempaddr > net.ipv6.conf.eth0.use_tempaddr = 0 > > Here I would have expected that eth0's use_tempaddr is 1, too. The > problem is not that this entry isn't writeable: The "all" value is propagated at the first moment that the ipv6 device private is created, usually that is when the device is first brought up which means it can happen as early as the exact moment the device is registered. Therefore, if you want "all" to apply to "eth0", you must make sure the sysctl is set properly before the device is registered. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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