Eduardo Spremolla edspremolla at
Wed Apr 13 14:01:21 CEST 2005

Yes, the OpenSwan is mutch more clear, yuo have the packet with the
originals ip in the nat post chain to the tunn0 device. 

Is there any chance to aplay NETMAP to the source ip on PREROUTING ?


On Tue, 2005-04-12 at 21:11 +0200, Daniel Lopes wrote:
> Eduardo Spremolla schrieb:
> > I have 2 local networks and interconnected by
> > a ipsec tunnel running on kernel 2.6 native ipsec. So far so good.
> > 
> > Now the admin of wants me to NAT my network to
> > because he had a ip conflict. I cant SNAT because when the packet goes
> > to nat post it has been encapsulated in ESP and had the firewalls
> > address, as you can see in the bottom log snipe.I try to use NETMAP in
> > mangle PREROUTING, but it changes the dest ip , not the source.
> > 
> > Is this possible?
> > 
> > Thanks in advance for any clue.
> > 
> > LALO
> > 
> According to, besides I don´t 
> really know how and when NETMAP interacts, it should work if you use an 
> Interface for IPSec like the alternative IPSec stack implemented by 
> FreeS/WAN. For the native stack I don´t know if it will work you will 
> need to know when it exactly interacts. It will probably only work when 
> implemented directly into the IPSec stack.

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