From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harsh Subject: Re: help in using eth_change_mtu Date: Tue, 25 Jan 2005 11:50:06 +0530 Message-ID: References: <41F5C109.7060801@gmail.com> Reply-To: Harsh Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: linux-net@vger.kernel.org, netdev@oss.sgi.com Return-path: To: Neema In-Reply-To: <41F5C109.7060801@gmail.com> Sender: linux-net-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hello , Extra info mean IPSEC headers. How can they sent in 2.4.24 kernel? where can i find Packets being using IPSEC headers and is that require to reduce MTU by AH/ESP header bytes??? Also can you tellme in which condition eth_change_mtu used? reagards, Harsh. On Tue, 25 Jan 2005 09:16:17 +0530, Neema wrote: > 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; > > } > >- > >To unsubscribe from this list: send the line "unsubscribe linux-net" in > >the body of a message to majordomo@vger.kernel.org > >More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > > > -- > > Thanks & Regards, > Neema > >