Re: Using ipv4 over ipv6

From: Varun Chandramohan
Date: Wed Oct 10 2007 - 01:26:48 EST


Bill Fink wrote:
> On Tue, 09 Oct 2007, Varun Chandramohan wrote:
>
>
>> Hi All,
>>
>> I have a system setup where i want to send ipv4 packets over
>> ipv6 n/w. I suppose this feature has been recently added in 2.6.22. So
>> iam using that kernel.
>> My setup:
>>
>> (eth0) (eth1) (eth1) (eth0)
>> ----| RT1 |------------| RT 2 |----
>>
>>
>> RT1 :
>> eth0
>> 192.168.1.1
>> eth1:
>> 3001:470:1f00:ffff::190
>>
>> RT2:
>> eth0:
>> 172.16.15.1
>> eth1:
>> 3001:470:1f00:ffff::189
>>
>> I created a tunnel using ip6_tunnel, which i believe has this support.
>> RT 1:
>> #ip -6 tunnel add mytun remote 3001:470:1f00:ffff::189 local
>> 3001:470:1f00:ffff::190 dev eth1
>> #ip link set dev mytun up
>> #ip -6 addr add 4001:470:1f00:ffff::190 dev mytun
>> #route add -net 192.168.1.0/24 mytun
>>
>> RT2:
>> #ip -6 tunnel add mytun remote 3001:470:1f00:ffff::190 local
>> 3001:470:1f00:ffff::189 dev eth1
>> #ip link set dev mytun up
>> #ip -6 addr add 5001:470:1f00:ffff::190 dev mytun
>> #route add -net 172.16.15.0/24 mytun
>>
>> With this i thought i can ping from 192.x.x.x to 172.x.x.x and vice
>> versa. But its not happening :(. Iam not sure why. When i capture
>> packets on the eth1 interface, i dont see packets coming out. Please help.
>>
>> btw, i have enabled fwd for ipv6 and ipv4 also and flushed all ip6tables
>> and iptables rules just in case.
>>
>> Regards,
>> Varun
>>
>
> Don't you have the routes swapped, i.e. the "route add" you have on
> RT1 should be on RT2, and vice versa.
>
>
Oh sorry, its not swapped. I have swaped the ipv4 addresses of RT1 and
RT2. Thats mistake in the configuration. But thats not the issue. That
is set correct in the setup.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c4d3efafcc933fd2ffd169d7dc4f980393a13796

I see the support, but iam not able to use it. Did anyone manage to do
this?

Regards,
Varun
> -Bill
> -
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