Message-ID: <52E7CAD6.4020500@6wind.com>
Date: Tue, 28 Jan 2014 16:20:54 +0100
From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reply-To: nicolas.dichtel@6wind.com
Organization: 6WIND
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
MIME-Version: 1.0
To: zhuyj <zyjzyj2000@gmail.com>, "David S. Miller" <davem@davemloft.net>,
        netdev@vger.kernel.org, kuznet@ms2.inr.ac.ru, jmorris@namei.org,
        yoshfuji@linux-ipv6.org, kaber@trash.net, linux-kernel@vger.kernel.org
Subject: Re: How to identify 6to4 and 6in4 tunnels
References: <52E63779.5090101@gmail.com> <52E65817.1090904@6wind.com> <52E75D23.10909@gmail.com> <52E75EA5.4070102@gmail.com>
In-Reply-To: <52E75EA5.4070102@gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org

Le 28/01/2014 08:39, zhuyj a ?crit :
> On 01/28/2014 03:32 PM, zhuyj wrote:
>> On 01/27/2014 08:59 PM, Nicolas Dichtel wrote:
>>> Le 27/01/2014 11:39, zhuyj a ?crit :
>>>> Hi, Maintainers
>>>>
>>>> In our scene, we will create the 6in4/6to4 tunnel firstly and need to check the
>>>> tunnel type, secondly, we will configure the ip address on it. So, Could we
>>>> have
>>>> any way to get the actual tunnel for 6in4 and 6to4 from current linux version?
>>>>
>>>> Both 6in4 and 6to4 have the same protocol ?IPPROTO_IPV6? in Linux kernel. The
>>>> only difference is the ip address on the tunnel. Can we distinguish them in
>>>> Linux kernel?
>>> Just check the prefix, like it is done in check_6rd().
>>>
>>>
>>> Regards,
>>> Nicolas
> Hi, Nicolas
> Thanks for your reply. Maybe I can configure 6to4 tunnel by the following commands:
>
>   ip tunnel add tun6to4 mode sit remote any local 1.202.252.122 ttl 64
>   ip link set dev tun6to4 up
>   ip -6 addr add 2002:01ca:fc7a::0012:0225:2122/128 dev tun6to4
>   ip -6 route add 2000::/3 via ::192.88.99.1 dev tun6to4 metric 1
>
> But the kernel can not identify the tunnel is 6to4 tunnel or 6in4 tunnel
> immediately. After the packets travel through this tunnel, the kernel can
> identify the type of the tunnel by check_6rd.
>
> Is it right?
As soon as you have added the ipv6 addresses, you know that this tunnel is a
6to4 tunnel.
But what problem are you trying to solve?


Regards,
Nicolas
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/