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Getting systems MTU

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hplus0603    11347
The MTU is part of device configuration, and thus isn't very portable.

On Linux, you can open the device in question (if you can figure out which device it is) and issue an ioctl with SIOCGIFMTU as the operation.

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PERECil    164
On Windows, there's a RegKey which stores the MTU. if this RegKey doesn't exists, Windows uses a default value (1492 I think, but i'm not really sure about it).

the reg key is:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\[Adapter]\MTU

(source: http://www.winguides.com/registry/display.php/280/)

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