[Swan] converting to use NAT traversal

[Alex]

Hi,

I managed to convince the admin to port forward both 4500 and 500,
along with AH and ESP to my 10.201.2.2 IP from the static external
96.56.24.210 (wyckoff) IP but I still can't get it to work.

Both sides are now static IPs. On wyckoff (96.56.24.210 externally,
10.201.2.2 on the server itself), I'm seeing the following:
# ipsec auto --up orion-wyckoff
000 initiating all conns with alias='orion-wyckoff'
022 "orion-wyckoff/2x2": We cannot identify ourselves with either end
of this connection.  68.195.193.42 or 96.56.24.210 are not usable
022 "orion-wyckoff/2x1": We cannot identify ourselves with either end
of this connection.  68.195.193.42 or 96.56.24.210 are not usable
022 "orion-wyckoff/1x2": We cannot identify ourselves with either end
of this connection.  68.195.193.42 or 96.56.24.210 are not usable
022 "orion-wyckoff/1x1": We cannot identify ourselves with either end
of this connection.  68.195.193.42 or 96.56.24.210 are not usable

Jan  4 21:27:00.402928: packet from 68.195.193.42:40384: initial Main
Mode message received on 10.201.2.2:500 but no connection has been
authorized with policy PSK+IKEV1_ALLOW
Jan  4 21:21:21.836883: packet from 68.195.193.42:500: initial parent
SA message received on 10.201.2.2:500 but no suitable connection found
with IKEv2 policy
Jan  4 21:21:21.836908: packet from 68.195.193.42:500: responding to
IKE_SA_INIT (34) message (Message ID 0) from 68.195.193.42:500 with
unencrypted notification NO_PROPOSAL_CHOSEN

Here is my config again. I've tried to hardcode the IP just in case,
but I'm not sure that really matters, since it's a static IP and has a
DNS entry.

conn orion-wyckoff
        ikev2=insist
        authby=rsasig
        auto=start
        interfaces=%defaultroute
        dpddelay=10
        dpdtimeout=90
        dpdaction=clear
        rightsubnets={192.168.11.0/24,192.168.10.0/24}
        rightid=@wyckoff-orion
        right=96.56.24.210
        rightrsasigkey=0sAwEAAd4EeKjbFI7mmwxfztoH9AfzQUlk...
        leftid=@orion-wyckoff
        left=orion.guardiandigital.com
        leftsubnets={192.168.1.0/24,192.168.6.0/24}
        leftrsasigkey=0sAwEAAeSMFxvoJaP54tr660XAjQN35fCKMhi6Ax...


On Sat, Jan 4, 2020 at 4:25 AM Nick Howitt <nick at howitts.co.uk> wrote:
>
> Try changing right to %any. Also check that your firewall allows udp:4500. If you use different configs at either end, then auto should be "add" at orion and can be "start" at wyckoff.
>
> Nick
>
> On 03/01/2020 21:57, Alex wrote:
>
> Hi,
> I've had a site-to-site VPN using libreswan built and working between
> two Optonline/Altice systems, one with a dynamic IP and the other with
> a static IP, for quite some time, but we've had to move the satellite
> office with the dynamic IP to one where we're only given a private
> 192.168.1.0/24 network and have no access to the outside public IP
> interface.
>
> Can I use NAT traversal for this? If so, how do I convert my existing
> configuration to use it?
>
> In this config, "wyckoff" is the dynamic (now private IP) side and
> "orion" is the static IP side.
>
> conn orion-wyckoff
>         ikev2=insist
>         authby=rsasig
>         auto=add
>         dpddelay=10
>         dpdtimeout=90
>         dpdaction=clear
>         rightid=@wyckoff-orion
>         rightsubnets={192.168.11.0/24,192.168.10.0/24}
>         right=wyckoff.example.com
>         rightrsasigkey=0sAwEAAd4EeKjbFI7mmwxfztoH9AfzQUlk7ffvgDNNbj...
>         leftid=@orion-wyckoff
>         left=orion.example.com
>         leftsubnets={192.168.1.0/24,192.168.6.0/24}
>         leftrsasigkey=0sAwEAAeSMFxvoJaP54tr660XAjQN35fCKMhi6AxnXMP8iu...
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