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Traffic between 2 interfaces

I have added a dmz to my network using a separate interface. 
Both networks are able to go to the internet.
The internal network can ping/communicate with the dmz but the dmz is unable to initiate traffic to the internal network(pings fail)
I have rules allowing both networks to use any service going anywhere.

From the DMZ I can ping the gateway of the  internal network but nothing else. 
Routing is suppose to be automatic, what am I missing?


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Parents
  • Do the devices in both networks have the corresponding UTM IP as default gateway?

    ----------
    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
  • Do the devices in both networks have the corresponding UTM IP as default gateway?

    ----------
    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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