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How to setup Site to Site IPSEC VPN When Both Sites is Behind NAT (Router FTTH)

Adil Arabi idrissi

Dear all,

I have two Sophos UTM units at two sites, both are currently behind NAT routers. Both sites have Static Public IPs, both sites use PPPOE to connect to the internet. The PPPOE in both cases is being handled by the NAT router rather than the UTM. 

I would like to connect up a site to site network via IPSec using these two UTMs. 

Everyone says you have to create a NAT, But I don't know the steps ??

 

Fowording : 

Router NAT : 500TCP/UDP 5400TCP/UDP 

Any suggestions on how to solve this? If you need any additional info please do not hesitate to ask.



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  • in reply to Adil Arabi idrissi

    Hi,

    "Everyone says you have to create a NAT" ... that's correct

    ... but you have to create these MAT at the Provider Router. This device has to forward incoming Port 500 UDP and 4500UDP to the WAN interface of the UTM behind


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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