From: Andrew Morton <akpm@linux-foundation.org>
To: netdev@vger.kernel.org, Maxim Krasnyansky <maxk@qualcomm.com>
Cc: bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, mcisho@yahoo.com
Subject: Re: [Bugme-new] [Bug 14839] New: Trying to use a TUN device fir IPv6 traffic, cannot set destination address.
Date: Tue, 22 Dec 2009 15:12:38 -0800 [thread overview]
Message-ID: <20091222151238.e7e44e36.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-14839-10286@http.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Sat, 19 Dec 2009 10:35:18 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=14839
>
> Summary: Trying to use a TUN device fir IPv6 traffic, cannot
> set destination address.
> Product: Networking
> Version: 2.5
> Kernel Version: 2.6.31.6
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: IPV6
> AssignedTo: yoshfuji@linux-ipv6.org
> ReportedBy: mcisho@yahoo.com
> Regression: No
>
>
> I am modifying a program that uses a TUN device for IPv4 traffic so that the
> same TUN device can also be used for IPv6 traffic. Using ioctl SIOCSIFADDR will
> add an IPv6 address but ioctl SIOCSDSTADDR to add an IPv6 destination address
> always results in error ENODEV (19 No such device).
>
> I searched around the source and found addrconf_set_dstaddr in addrconf.c which
> seems to be the routine called to set the destination address. However, the
> routine only sets a destination address for a SIT device, otherwise if returns
> ENODEV.
>
> Below is the ifconfig output for the TUN device:-
> $ ifconfig tun3
> tun3 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> inet addr:192.168.3.235 P-t-P:192.168.250.235 Mask:255.255.255.255
> inet6 addr: fd00::3:235/128 Scope:Global
> UP POINTOPOINT RUNNING MTU:1344 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
> BTW, ifconfig cannot add an IPv6 destination address either, the code has a
> comment saying that the support needs to be written.
>
> Can a TUN device be used for IPv6 traffic? I cannot find a definitive answer,
> only 'should'. Or is that nobody has ever wanted to use a TUN device for IPv6
> traffic, and so the kernel support has not been written? Or am I doing
> something wrong?
>
next parent reply other threads:[~2009-12-22 23:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-14839-10286@http.bugzilla.kernel.org/>
2009-12-22 23:12 ` Andrew Morton [this message]
2009-12-22 23:23 ` [Bugme-new] [Bug 14839] New: Trying to use a TUN device fir IPv6 traffic, cannot set destination address Stephen Hemminger
2009-12-28 19:00 ` Max Krasnyansky
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