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Date: Mon, 23 Aug 2010 09:52:21 +0200
From: VANHULLEBUS Yvan <vanhu@FreeBSD.org>
To: freebsd-net@FreeBSD.org
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Subject: Re: IPsec support in FreeBSD
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On Mon, Aug 23, 2010 at 02:37:16AM +0530, Ashish SHUKLA wrote:
> Hi,

Hi.


> I'm running 8.1-RELEASE on amd64.
> 
> I'm connecting to an IPsec VPN (IPv4, dynamic keying using racoon) from behind
> a NAT and I'm having strange issues working with it. IPsec negotiation
> succeeds but there are problems with sending traffic over the tunnel.

In fact, you're trying to set up an IPsec tunnel through a NAT, with
an userland probably compiled by default with NAT-T support, but a
kernel without NAT-T support according to your kernel configuration
file.


To have it work, first add "options IPSEC_NAT_T" to your kernel conf
file, compile / install it again. Then install -HEAD version of
ipsec-tools, as it is actually the only one to be able to send
correctly NAT-T PFkey extensions to FreeBSD kernel.

Then you'll have time to deal with other things such as racoon.conf or
filtering stuff :-)


Yvan.