So recently I tryed to get untangle working in transparent bridge mode as a VM under ESXi but I could not get packets flowing from the lan to the wan sides, or even from the lan side to the untangle. However the untangle vm itself could see the internet ... strange hmm.
Well after much googleing I found the cause of the issue. It turns out that in bridge mode the untangle needs full network card functionality and hence you have to enable 'promiscuous mode' on the virtual switches associated with the LAN and WAN ends of the untangle vm. The ESXi Vswitches 'promiscuous mode' defaults to disabled.
The above shows where the setting is once you get to the virtual switch list (Configuration > Networking).
Hope this will be of help to someone ;-)
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