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SubjectRe: How to identify 6to4 and 6in4 tunnels
On 01/28/2014 03:39 PM, zhuyj wrote:
> 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 écrit :
>>>> 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?
>
> Best Regards!
> Zhu Yanjun
>
>
Hi, David

I want to identify sit interface 6to4 or 6in4 with the following parameters.

include/uapi/linux/if_tunnel.h
...
struct ip_tunnel_parm {
char name[IFNAMSIZ];
int link;
__be16 i_flags; <---------I want
to use this variable to identify the type of sit interface. Can I?
__be16 o_flags;
__be32 i_key;
__be32 o_key;
struct iphdr iph;
};
...

Please comment on this ? Thanks a lot.

Best Regards!
Zhu Yanjun
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