No internet after upgrading from 2.5.1 to 2.5.2
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I had to install 2.6.0-DEVELOPMENT version in order to fix this issue. It turns out that 2.5.2 is preferring IPV6 for all traffic and if you have IPV6 blocked on your network nothing will work. You could disable IPV6 locally on the devices themselves but I just upgraded to the devel version and now that's fixed.
I tried reapplying the prefer IPV4 over IPV6 settings but that did not seem to work.