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Re:pfSense: Open source network firewall distribution by gonzo on Friday February 10, 2017 @03:28PM (#13618600)
The answer here is 'Yes'. TSO and routing / packet filtering are incompatible.

https://wiki.freebsd.org/10gFreeBSD/Router#Disabling_LRO_and...

Re:pfSense: Open source network firewall distribution by ComputerGuru on Saturday February 11, 2017 @10:00AM (#13622867)
So why isn't it disabled out of the box (on pfSense, not FreeBSD)?
Re:pfSense: Open source network firewall distribution by gonzo on Saturday February 11, 2017 @05:17PM (#13625169)
Re:pfSense: Open source network firewall distribution by ComputerGuru on Saturday February 11, 2017 @09:38PM (#13626328)
Do you know when this was instituted? I'm quite sure that wasn't the default when I set up my pfSense systems..