source: bootscripts/contrib/sysconfig/network-devices/services/mtu@ c13bac4

#!/bin/sh
########################################################################
# Begin $network_devices/services/mtu
#
# Description : Sets MTU per interface
#
# Authors     : Nathan Coulson - nathan@linuxfromscratch.org
#               Jim Gifford - jim@linuxfromscratch.org
#
# Version     : 00.00
#
# Notes       : This sets the maximum amount of bytes that can be
#               transmitted within a packet.  By default, this
#               value is set to 1500.
#
########################################################################

. /etc/sysconfig/rc 
. ${rc_functions}
. ${IFCONFIG}

if [ -z "${MTU}" ]
then
        boot_mesg "MTU variable missing from ${IFCONFIG}, cannot continue." ${FAILURE}
        echo_failure
        exit 1
fi

case "${2}" in
        up)
                boot_mesg "Setting the MTU for ${1} to ${MTU}..."
                echo "${MTU}" > "/sys/class/net/${1}/mtu"
                evaluate_retval
        ;;
        
        down)
        ;;
        
        *)
                echo "Usage: ${0} [interface] {up|down}"
                exit 1
        ;;
esac

# End $network_devices/services/mtu