[strongSwan] Routing Polices with IPTABLES not working

[Frédéric Demers]

I was able to get this working in the hub and spoke configuration with both
spokes exchanging through the tunnels, but I had to use the virtual IP
feature and use the private addressing scheme between the spokes. This
forced my traffic through the tunnels, and they were forwarded through the
hub.
I also found that I needed to use the left/rightnexthop statement (maybe
only needed in IKEv1) otherwise the hub could not reach the spokes, even
though the spokes could reach each other through the hub and the spokes
could independently reach the the hub. This was rather odd because the hub
should have known how to route to each spoke (and was doing so during
packet forwarding), but not if I used a terminal window to reach either
spokes. With the left/rightnexthop, it worked (under limited testing).

On 8 December 2012 17:36, Adrian Milanoski <amilanoski at rim.com> wrote:

> Hi Andrew,
>
> IP forwarding is enabled
>
> cat /proc/sys/net/ipv4/ip_forward
> 1
>
> The packets are not getting NAT'd after they arrive back to my GW.
>
> They are going back out my public as the originating IP that it was given
> from the virtual ip pool. E.g. 172.16.24.x
>
> I may also add that I have only 1 default GW on my GW and that is for the
> public. I do not have a GW set for my private network.
>
> I am trying to get it so that any packets that come from  172.16.24.x go
> back out to the private interface or to the default GW for that matter.
>
>
> Regards,
>
> Adrian Milanoski
> Lab Administrator
> BBOS WiFI VPN Dev. Security Testing
> Research In Motion Limited
> Tel.(289) 261-5801 | Cell: 647-289-6995
> Email  amilanoski at rim.com
>
>
>
>
> -----Original Message-----
> From: Andreas Steffen [mailto:andreas.steffen at strongswan.org]
> Sent: Friday, December 07, 2012 4:15 AM
> To: Adrian Milanoski
> Cc: Users at lists.strongswan.org
> Subject: Re: [strongSwan] Routing Polices with IPTABLES not working
>
> Hi Adrian,
>
> have you enabled IP forwarding on your VPN gateway?
>
>   echo 1 > /proc/sys/net/ipv4/ip_forward
>
> If yes, do you NAT packets from the private network behind the
> gateway going towards the Internet?
>
> If yes then you must exempt packets from the private network that
> are intended to go through the IPsec tunnel from NAT with the
> following iptables rule:
>
>   iptables -t nat -I POSTROUTING 1 -s <private network> -o eth0 \
>            -m policy --dir out --pol ipsec --proto esp -j ACCEPT
>
> Regards
>
> Andreas
>
> On 06.12.2012 19:37, Adrian Milanoski wrote:
> > HI All,
> >
> > I have a strongSwan 5.0 setup and configure using IKEv2 PSK in config
> > mode with the GW providing a pool of addresses. However after the
> > strongSwan client connects I can only ping the Private interface of the
> > VPN GW.
> >
> > I was wondering if anyone can assist me with what maybe going on and why
> > packets are not routing out the private interface to the private
> > networks default GW.
> >
> > Why is it so difficult to get these packets flowing from the tunnel to
> > the private network? I thought the certain commands were to add rules in
> > to the IPtables and remove them when the tunnel is torn down.
> >
> > Any help would be much appreciated.
> >
> > *Regards,***
> >
> > */ /*
> >
> > */Adrian Milanoski/*
> > BBOS Lab Administrator
> >
> > VPN / WLAN IOT / Pre-Cert
> >
> > Research In Motion Limited
> > 4715 Tahoe Blvd, Mississauga,
> > ON, Canada, L4W 0B5
> > Tel.(289) 261-5801|Fax (905) 629-7836
> > Email amilanoski at rim.com <mailto:amilanoski at rim.com>**
> >
> >
> >
> >
> >
> >
> >
> > Description: www.rim.com <http://www.rim.com/>Description:
> > cid:image001.png at 01CB37B8.EC492D80
> ======================================================================
> Andreas Steffen                         andreas.steffen at strongswan.org
> strongSwan - the Linux VPN Solution!                www.strongswan.org
> Institute for Internet Technologies and Applications
> University of Applied Sciences Rapperswil
> CH-8640 Rapperswil (Switzerland)
> ===========================================================[ITA-HSR]==
>
>
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