Default MTU setting

So I was having issues using publicvpn.com and one of the suggestions was to enter the following command in the terminal sudo ifconfig en1 mtu 1200 however now when downloads are cutting out. Is there a way to revert back to the OEM setting and if so how?
Thank you

You can just re-issue the ifconfig command with a different value. The default is typically 1500, but may be lower depending on your network configuration.
Alternatively, since changes made via ifconfig are transient, you can just reboot your machine and revert to defaults.

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