ref: https://support.sophos.com/support/s/article/KB-000036802?language=en_US
When defined interface is not available, it falls back to the primary wan interface instead of generating an error (or not connecting at all). Is this by design?
Test case:
Have a separate web filter profile defined specifically for ipv6. Created an additional ipv6 address (under interfaces/additional address) for wan interface using one of the available /60 subnets. When additional interface is toggled on, all works as expected. When off, it falls back to the main wan interface. Test this by going to various test sites that reveal the connecting ipv6 source address (ipv6-test.com for example).
Can't test with ipv4 as only assigned a single address.
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