[strongSwan] Problem connecting to a Cisco Unity gateway

Bas van Dijk v.dijk.bas at gmail.com
Wed Feb 18 16:39:49 CET 2015

On 16 February 2015 at 17:19, Tobias Brunner <tobias at strongswan.org> wrote:
> As Noel pointed out it could mean the responder doesn't like the
> proposed algorithms.  But the responder could also return this error
> because it doesn't like the proposed traffic selectors (i.e. the subnets
> in `left|rightsubnet`) or the mode (type=tunnel|transport).

Hi Tobias, thanks for your very informative and helpful reply. You
were spot-on with the incomplete traffic selectors. It turned out the
server is configured to only accept traffic from the
subnet. So after setting:

  leftsubnet =

I can successfully establish the VPN with the server.

So am I right that the only thing left to do is configure my system so
that packets to hosts on the subnet appear to come from
a host on the subnet?

To accomplish this I already added the additional IP address to my NIC (besides the DHCP configured

What's the next step? Do I need to add a route or some iptables rule?



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