Thanks,

 

But  even v6 in v4 doesn’t seem to work with NETLINK XFRM interface.

 

Regards,

Prashant

 

From: Loren M. Lang [mailto:lorenl@alzatex.com]
Sent: Friday, January 13, 2012 12:58 PM
To: Prashant Batra (prbatra)
Cc: ipsec-tools-devel@lists.sourceforge.net; netdev@vger.kernel.org
Subject: Re: [Ipsec-tools-devel] ipsec tunnel with different inner and outer ip families

 

On 1/12/2012 11:11 PM, Prashant Batra (prbatra) wrote:

Hello,

 

Does linux 2.6.* support an IPSec tunnel with different family of inner and outer addresses , like v4 in v6 or v6 in v4.

After trying ip xfrm * from user space, the utility doesn’t seem to accept two different families in a single command.


Yes, I've done this in the past, but I took a different approach.  If I recall correctly, I use IPSec in tunnel mode to tunnel IPv6 inside ESP running over IPv4.  I haven't used ip xfrm before, but I did it with setkey and /etc/ipsec.conf with lines like the following:

spdadd 192.168.1.1 192.168.2.1 ipv6 -P in ipsec esp/transport//require;
spdadd 192.168.2.1 192.168.1.1 ipv6 -P out ipsec esp/transport//require;

Unfortunately, I'm not in a state to test this right now.

 

#ip xfrm policy add dir out src 172.168.68.1/32 dst 172.168.68.2/32 tmpl src 2001:db8:0:242::36/128 dst 2001:db8:0:242::37/128 proto esp  mode tunnel

Error: an inet prefix is expected rather than "2001:db8:0:242::36/128".

 

So, I tried sending a NETLINK SPD add message) from user space with, selector as v4 addresses and tmpl as v6 address.

Policy got added but kernel doesn’t seem to be interpreting the addresses correctly.

 

src 172.16.80.1/32 dst 0.0.0.0/0

        dir out priority 1024

        tmpl    src 32.1.13.184 dst 32.1.13.184   /* I gave ipv6 addresses here*/

                proto esp spi 0x00000000 reqid 0 mode tunnel

 

Can someone help me with this?

 

Regards,

Prashant.




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