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DNS through vpn over NAT

Webmaschder
Hi @all,

I've got a quite big problem in my 
*irony mode on* secret favorite topic => DNS *irony mode off* [:D]

We are using a special natted Site-to-Site VPN, described in the german Board: https://community.sophos.com/products/unified-threat-management/astaroorg/f/68/t/62093

Well, the Tunnel works fine (although I did not get any reply). I'm able to access the remote Server/shares and Websites. BUT (and this is a quite big BAD): we can only connect the server using IP Addresses becaus DNS is not working.
So I created two Request Routing Rules and added the remote DNS Server in the "Forwarders" Section in DNS Tab like BAlfson wrote in another Thread (Thx for that ;-) )

If I add a static DNS entry for one remote server, I'm able (hardly surprising..) to resolve this name.

Here is a diagram from Cisco that matches exactly my situation (but the IP addresses). just to get a better view:


Any ideas? Hope so.. [:)]

Regards


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  • 0
    Sorry, I think I still don't fully understand your networking setup... [;)]

    In your diagram there is a 10.10.10.0/24 net. You didn't emtion this one?
    And just for my understanding: why do you have to use NAT? Is it because your local network is already used at another site connected to the remote network?

    ----------
    Sophos user, admin and reseller.
    Private Setup:

    • XG: HPE DL20 Gen9 (Core i3-7300, 8GB RAM, 120GB SSD) | XG 18.0 (Home License) with: Web Protection, Site-to-Site-VPN (IPSec, RED-Tunnel), Remote Access (SSL, HTML5)
    • UTM: 2 vCPUs, 2GB RAM, 50GB vHDD, 2 vNICs on vServer (KVM) | UTM 9.7 (Home License) with: Email Protection, Webserver Protection, RED-Tunnel (server)
Reply
  • 0
    Sorry, I think I still don't fully understand your networking setup... [;)]

    In your diagram there is a 10.10.10.0/24 net. You didn't emtion this one?
    And just for my understanding: why do you have to use NAT? Is it because your local network is already used at another site connected to the remote network?

    ----------
    Sophos user, admin and reseller.
    Private Setup:

    • XG: HPE DL20 Gen9 (Core i3-7300, 8GB RAM, 120GB SSD) | XG 18.0 (Home License) with: Web Protection, Site-to-Site-VPN (IPSec, RED-Tunnel), Remote Access (SSL, HTML5)
    • UTM: 2 vCPUs, 2GB RAM, 50GB vHDD, 2 vNICs on vServer (KVM) | UTM 9.7 (Home License) with: Email Protection, Webserver Protection, RED-Tunnel (server)
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