On 10/18/12 2:33 PM, Brad Faler wrote:
> Hi Everyone,
> 
> I'm trying to set up an IPSec tunnel between one of my offices and a 
> vendor's network.  I have the tunnel connecting, but I'm hitting a brick 
> wall on figuring out how to make my shorewall/iptables system work with it.
> 
> This setup is very different from anything I have previously set up in 
> that they are requiring that I use SNAT to make all packets from our 
> network appear to be coming from a subnet that they have provided and 
> I'm not sure I understand how to accomplish this within shorewall.
> 
> Here is what we have (these aren't the real IPs):
> 
> My Network
> 
> 192.168.27.1 - Firewall (Internal IP)
> 10.8.0.1 - Public IP
> 10.9.0.1 - Vendor Public IP
> 10.60.72.72/30 - Subnet to NAT source traffic to
> 
> Here's what I have for my IPSec config (which is connecting without issues)
> 
> conn sec1
>          authby=secret
>          left=10.8.0.1
>          leftsubnet=10.60.72.72/30
>          right=10.9.0.1
>          rightsubnet=10.167.50.56/32
>          auto=start
>          pfs=no
>          ike=aes-256-sha1-modp1024
>          esp=aes-256-sha1
> 
> In Shorewall I have a pretty standard 2 network card setup:
> 
> eth0 - Local Network
> eth1 - Internet
> 
> I have a couple other IPsec tunnels running on this machine and defined 
> in the zones and tunnels files.nano t
> 
> Can anyone give me some tips about how I go about NAT'ing my source 
> traffic in shorewall for something like this?  I'm thoroughly confused.

Try this in /etc/shorewall/masq:

eth1:10.167.50.56       192.168.27.0/24 10.60.72.73

-Tom
-- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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