FG

Why does Mac OS X insist on changing my MTU to 1500?

Fresh3 days ago
Mar 15, 202620754 views
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Problem

Recently (I think after updating to 10.6.4) Mac OS X has insisted on changing my MTU to 1500, even though the router which my Mac connects to directly has an MTU of 1472. I've noticed that manually setting the MTU to 1472 drastically increases performance, presumably because it all but eliminates p…

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Fix for: Why does Mac OS X insist on changing my MTU to 1500?

Low Risk

You can turn off the automatic discovery of MTU size on Mac OS X with this : Session only : Permanent : Edit the file , for example : Then add the following line : Finally reboot This will prevent Mac OS X from automatically setting the MTU size, bu…

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