From: Andrew Morton <akpm@linux-foundation.org>
To: netdev@vger.kernel.org
Cc: bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, nedyalkor@gmail.com
Subject: Re: [Bugme-new] [Bug 15342] New: max_address parameter is not taken into consideration when IPv6 addresses are created
Date: Mon, 22 Feb 2010 13:08:58 -0800 [thread overview]
Message-ID: <20100222130858.3c186888.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-15342-10286@http.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Wed, 17 Feb 2010 14:12:28 GMT bugzilla-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=15342
>
> Summary: max_address parameter is not taken into consideration
> when IPv6 addresses are created
> Product: Networking
> Version: 2.5
> Kernel Version: 2.6.32.5
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: low
> Priority: P1
> Component: IPV6
> AssignedTo: yoshfuji@linux-ipv6.org
> ReportedBy: nedyalkor@gmail.com
> Regression: No
>
>
> >From ip-sysctl.txt file in kernel documentation I can see following description
> for max_addresses:
> max_addresses - INTEGER
> Number of maximum addresses per interface. 0 disables limitation.
> It is recommended not set too large value (or 0) because it would
> be too easy way to crash kernel to allow to create too much of
> autoconfigured addresses.
> Default: 16
>
> On my machine all parameters are set to default value 16:
> # sysctl -a|grep max_addresses
> net.ipv6.conf.all.max_addresses = 16
> net.ipv6.conf.default.max_addresses = 16
> net.ipv6.conf.lo.max_addresses = 16
> net.ipv6.conf.eth0.max_addresses = 16
>
> To my understanding I should not be able to create more than 16 IP addresses,
> but in fact I am able do it:
>
> # for i in `seq 1 16`; do ip addr add fec0::$i/64 dev eth0; done
> # ip addr add fec0::17/64 dev eth0
> # ip -6 addr
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
> inet6 fec0::17/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::16/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::15/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::14/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::13/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::12/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::11/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::10/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::9/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::8/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::7/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::6/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::5/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::4/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::3/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::2/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fec0::1/64 scope site
> valid_lft forever preferred_lft forever
> inet6 fe80::223:aeff:fe77:44ba/64 scope link
> valid_lft forever preferred_lft forever
>
>
> If this parameter applies only for auto-configured IP addressed, please state
> it more clearly in docs or rename the parameter to show that it refers to
> auto-configuration.
>
next parent reply other threads:[~2010-02-22 21:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-15342-10286@http.bugzilla.kernel.org/>
2010-02-22 21:08 ` Andrew Morton [this message]
2010-02-22 22:27 ` [PATCH] IPv6: better document max_addresses parameter Brian Haley
2010-02-23 9:25 ` David Miller
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