Blog – Dan Joannis

FreeBSD / pfSense slow network with Hyper-V

For some reason, it took me way too long to find information about this issue – so I’m writing another article that will hopefully help some people.

IT Ticket # 1337

Problem Description: Network performance through pfSense is extremely slow with Hyper-V

Software Versions: pfSense 2.6.0 and Windows Server 2022 (August 2022 patches)

Steps Taken Already: Confirmed hardware TCP offload is disabled; confirmed hardware checksum disabled; confirmed MTUs were correct.

Solution: Read on for the solution (hint: it’s a known driver bug, and for now only a workaround exists)

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Tags: firewall, performance, server