Firstly - the web filter doesn't pass through the IPv6 address of the source machine, instead it passes the IPv6 WAN address - not sure if this is correct? I would personally have thought that with IPv6, the web-filter would work in full transparent mode by default - as the nature of IPv6 is to present the IPv6 address of the individual machine.
Secondly, there appears to be a DNS issue with IPv6, sometimes web-sites will not work (YouTube.com for example), they will half load and then freeze - turning off the Web-Filter resolves the issues, but then obviously lessens the functionality of the UTM - turning off the "Enable Pharming protection" has helped a little, but it still happens frequently.
Using the http://test-ipv6.com web-site, this reports that there are issues with Test with Dual Stack DNS record, Test for Dual Stack DNS and large packet.
Turning off the web-filter and everything starts working 100%.
