Re: help in using eth_change_mtu

Neema <neema.network@xxxxxxxxx> · Tue, 25 Jan 2005 09:16:17 +0530

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

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