Why Your MTU Setting Is Probably Wrong

Logosofia no Dia a Dia · May 18, 2026 · 26m

Thousands of people blindly set their MTU to 1492 because forum advice from the DSL era never died. But modern fiber connections using DHCP instead of PPPoE should be running 1500 — and that eight-byte difference adds unnecessary overhead to everything you do online. In this episode, we break down where 1492 actually comes from, why Path MTU Discovery breaks on modern networks, how MSS clamping works as a workaround, and exactly how to test your own connection empirically. If you're running OPNsense on fiber and want to stop cargo-culting your network config, this one's for you. Episode 2916…