Question about MTU

From: Aron Silverton (
Date: 2002-08-28 19:35:28 UTC

Hi all,

While trying to get the Open1x Authenticator code running on a hostap enable linux box, I ran into the following problem:

The first EAP Request packet from the authenticator/AP to the supplicant   is of size 1778. This packet size is correct. This exceeds the MTU of an Ethernet interface, but not the maximum payload for an 802.11b frame. I eventually figured to increase the MTU of my wlan0 interface to 1800 and was able to get working.

My questions are:

What is the best way to determine an appropriate MTU for a wlan interface and where should it be set? Would it be possible or more appropriate for either the hostap driver or the authenticator code to control this via socket options as needed?



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