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Optimising MTU setting in PPPoE ADSL Connections
Authored by: jeffbyrnes on Aug 26, '05 12:06:16PM

Just to let everyone know, there is a built-in GUI method for altering the MTU of an ethernet network connection; if you open the Network prefs pane, double click on built-in ethernet, then click the ethernet tab on the far right. The "Configure" menu will say "Automatically", change it to "Manually", then you'll see a few options appear, one of which is "Maximum Packet Size (MTU)". Click the "Custom" radio buttom, and type in 1492. Click Apply Now, and enjoy.


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Optimising MTU setting in PPPoE ADSL Connections
Authored by: cahaddras on Aug 26, '05 07:04:59PM

This works fine for communicating directly over ethernet, but unfortunately makes no difference to the MTU value negotiated on a PPPoE connection. This is arguably a bug, as when PPPoE is configured under Mac OS X, direct communication over ethernet is no longer available (unless you configure it down at the UNIX level). So it would be appropriate that if the ethernet MTU is configured in network preferences when PPPoE is enabled, then this should set the PPPoE MTU instead, but it doesn't (on 10.4.2 at least).

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