Re: Using ipv4 over ipv6

From: Bill Fink
Date: Wed Oct 10 2007 - 01:21:30 EST


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.

-Bill
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