RE: change_mtu boundary checking error

Hen, Shmulik (shmulik.hen@intel.com)
Wed, 18 Apr 2001 00:25:26 -0700


But Ethernet is not only for IP, what about other protocols ?

-----Original Message-----
From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk]
Sent: Tuesday, April 17, 2001 3:41 PM
To: shmulik.hen@intel.com
Cc: linux-net@vger.kernel.org; linux-kernel@vger.kernel.org
Subject: Re: change_mtu boundary checking error

> Now, the high boundary seemed reasonable (ETH_FRAME_LEN - ETH_HLEN =
> ETH_DATA_LEN) which gives 1500, but why is the low boundary set to 68 ?
> According to my calculations, it should have been ETH_ZLEN - ETH_HLEN
which
> gives 46.

The IPv4 minimum MTU is 68 bytes. Below that not all frames can be delivered

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