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DNS failing to resolve.

jkwha
Hi all,
I am running UTM 9.209-8 and am trying to use the web protection to monitor internet usage. My network is very simple (home usage). 

Cable modem/router/DHCP -> UTM -> Cisco AP

The issue I am having is when I enable "web filtering" on to "Full transparent", the hosts/computer doesn't seem to be resolving the DNS. If I set to "standard mode", i have no issues surfing the web. I have tested this using the support->tools -> DNS lookup and it fails to resolve google.com on both transparent and standard mode

I have...
-both NIC's bridge
-DNS->Global -> bridged network interfaces added to the list.
-DNS Forwarders -> have tried google DNS and comcast DNS with "user   forwarders assigned by ISP" checked.

I know I'm missing something small. I have googled, checked this forum and also read the Sophos KB.

Any help would be appreciated!


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  • 0
    Transparent and Full Transparent assume that the client browser is doing its own DNS.  There are a lot of additional reasons for bridging your router so that you can put a public IP on the UTM's External interface.  Other important starting points are The Zeroeth Rule in Rulz and DNS Best Practice.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    Transparent and Full Transparent assume that the client browser is doing its own DNS.  There are a lot of additional reasons for bridging your router so that you can put a public IP on the UTM's External interface.  Other important starting points are The Zeroeth Rule in Rulz and DNS Best Practice.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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