From: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
To: Brian Haley <brian.haley@hp.com>
Cc: netdev@vger.kernel.org
Subject: Re: disabling ipv6 (when ipv6 module is already loaded or built in)
Date: Fri, 25 Mar 2011 23:53:06 +0100 [thread overview]
Message-ID: <201103252353.06297.a.miskiewicz@gmail.com> (raw)
In-Reply-To: <4D8CF970.7020601@hp.com>
On Friday 25 of March 2011, Brian Haley wrote:
> On 03/25/2011 01:17 PM, Arkadiusz Miskiewicz wrote:
> > Hi,
> >
> > There are two options for disabling some ipv6 functionality in ipv6
> > module - disable and disable_ipv6. The second option is also available
> > as sysctl and can be switched runtime.
> >
> > First is nicer because it also prevents apps from creating sockets by
> > using socket(AF_INET6, ...). Various apps use AF_INET6 socket creation
> > to deterine if ipv6 is supported on the system. Unfortunately "disable"
> > one doesn't exist as sysctl and this is a problem.
> >
> > Is it possible to make "disable" sysctl option, too? Currently there is
> > no runtime way to disable ipv6 (or I'm unaware of such way).
>
> Not really, the module parameter causes IPv6 to be loaded just enough to
> allow other modules that rely on it to load, but it never registers
> any of the protocol handlers, sysctls, tables, etc. to make it usable.
> And the IPv6 module isn't unloadable, so you have to reboot to change
> this setting.
>
> When there are no addresses it's not very usable since you can't send
> out packets...
The whole problem is that socket(AF_INET6,...) is allowed. If setting
net.ipv6.conf.all.disable_ipv6=1 would also prevent such socket() from
succeeding then everything would be fine.
> -Brian
--
Arkadiusz Miśkiewicz PLD/Linux Team
arekm / maven.pl http://ftp.pld-linux.org/
next prev parent reply other threads:[~2011-03-25 22:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-25 17:17 disabling ipv6 (when ipv6 module is already loaded or built in) Arkadiusz Miskiewicz
2011-03-25 20:22 ` Brian Haley
2011-03-25 22:53 ` Arkadiusz Miskiewicz [this message]
2011-03-25 22:56 ` David Miller
2011-03-27 21:19 ` Arkadiusz Miskiewicz
2011-03-27 21:24 ` David Miller
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