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NAT into remote VPN network

I have a running VPN Site to Site with this setup:

local network: 172.20.0.0/24
remote network 172.21.0.0/24

traffic between the 2 networks is passing as expected.

Now I like to access the remote network from another local network 172.16.0.0/16. Therefore, I do not want to route this network via VPN but using nat.

I have created a Nat policy with the host 172.20.0.200.

As Sophos has no interface for VPN (internal it may has one)  I don’t know how to route traffic to VPN-NAT.



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  • Hi,

    your VPN is a zone, so your VPN connection should use zone VPN.

    Ian

    XG115W - v19.5.1 mr-1 - Home

    If a post solves your question please use the 'Verify Answer' button.

  • I think, this wont work. Because if you want to use NAT in a IPsec Policy, you have to configure it in the IPsec Connection.

    But correct me if i am wrong. 

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  • Hi MBP,

    I will bow to your greater wisdom. I was only pointing out that his VPN should (would) in the VPN zone if setup correctly and he should use that zone. He was talking about no zone for his VPN.

    Ian

    XG115W - v19.5.1 mr-1 - Home

    If a post solves your question please use the 'Verify Answer' button.

  • Thanks for reply,


    I've no idea what you want me to do.

    All VPN's (there are many configured) are in the zone VPN and routing to a zone is not possible...

    intention is to hide local 172.16.0.0/16 network for remote site

    source ip's from 172.16.0.0/16 should be NATed. On this dedicated remote site all NATed traffic should come from source 172.20.0.200/32.

  • Hi,

    you should follow this KBA:

    https://community.sophos.com/kb/en-us/123356

    Basically you need an /32 Object as a SA in the IPsec tunnel and press "NAT" in the ipsec config. 

    Dont forget to "publish" the /32 SA to the other site of the connection. 

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