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Date: Tue, 22 Dec 2009 15:12:38 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: netdev@...r.kernel.org, Maxim Krasnyansky <maxk@...lcomm.com> Cc: bugzilla-daemon@...zilla.kernel.org, bugme-daemon@...zilla.kernel.org, mcisho@...oo.com Subject: Re: [Bugme-new] [Bug 14839] New: Trying to use a TUN device fir IPv6 traffic, cannot set destination address. (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@...zilla.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@...ux-ipv6.org > ReportedBy: mcisho@...oo.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? > -- 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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