From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neema <neema.network@gmail.com>
Subject: Re: help in using eth_change_mtu
Date: Tue, 25 Jan 2005 09:16:17 +0530
Message-ID: <41F5C109.7060801@gmail.com>
References: <cfc9593605012400595e529682@mail.gmail.com>
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Cc: linux-net@vger.kernel.org, netdev@oss.sgi.com
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To: Harsh <hanemade@gmail.com>
In-Reply-To: <cfc9593605012400595e529682@mail.gmail.com>
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Hi,

    What ever u may send,the maximum size of the packet in ethernet 
should be 1514bytes, that includes ethernet header (And also minimum is 
82bytes).
I think u are using old libnet version. That function sets the MTU with 
the given value if neither exceeded max and nor minimum.


HTH,
Neema

Harsh wrote:

>Hello,
>         If some extra information is required to be sent with each
>packet then does that require to change Ethernet MTU 1500 to
>1500-(Bytes in extra info) or its ok with 1500 value of MTU? While
>checking source code of net_init.c in drivers/net dir i found one
>function eth_change_mtu. I want to know does that helps? why its given
>there in source code?
>regards,
>Harsh.
>
>static int eth_change_mtu(struct net_device *dev, int new_mtu)
> {
>        if ((new_mtu < 68) || (new_mtu > 1500))
>                 return -EINVAL;
>        dev->mtu = new_mtu;
>        return 0;
> }
>-
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>  
>


-- 

Thanks & Regards,
Neema