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Multiple Networks - Non-Internal Networks Not Working

Hi - I am running into a wall with configuring UTM.  

I have 4 network adapters all set-up for these 4 networks: Segregated, DMZ, VPN, Internal.

Internal is working fine.  I can RDP into systems, file sharing is working, etc.

For all the others, I cannot: RDP between systems on that network segment, RDP into that network segment, nor get file sharing working.

I can; however, access the Internet.

Here is what I've tried:

1: Looking at firewall.  Nothing seems to be getting blocked from the live log.
2: I've also added a very accessible firewall port: all networks can access all networks.
3: I've looked at DNAT/SNAT/1:1, etc, but I'm not doing anything from external networks yet and I'm not trying to change rewrite the IP.


What am I missing?  [:(]

Thank, thanks, thanks to anyone who can help.


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  • Does it matter if i have each dhcp server marked as being on the same subnet of 255.255.255.0?


    Please explain this. It's not a problem that all networks have the same subnetmask (255.255.255.0 or /24), However with this subnet you should make sure that for every subnet the first 3 octets are not exactly the same otherwise the UTM doesn't know how to route.

    You could have ie

    192.168.1.0 / 255.255.255.0
    192.168.2.0 / 255.255.255.0
    192.168.3.0 / 255.255.255.0
    172.16.1.0 / 255.255.255.0

    But not 2 subnets with exactly the same network address. If you're still not sure the please 'Go advanced' and attach pictures of your DHCP server(s) config(s).

    Managing several Sophos UTMs and Sophos XGs both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.

    Sometimes I post some useful tips on my blog, see blog.pijnappels.eu/category/sophos/ for Sophos related posts.