1#!/bin/bash 2# Copyright 2021 Google LLC 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15 16# Every 30 seconds, send out an RA so that the kernel will receive a response. 17# This ensures that all BMCs (even ones that think they are routers) get updated 18# information from the other systems on the network. 19w=30 20while true; do 21 start=$SECONDS 22 rdisc6 -m gbmcbr -r 1 -w $(( w * 1000 )) >/dev/null 2>/dev/null 23 # If rdisc6 exits early we still want to wait the full `w` time before 24 # starting again. 25 (( timeout = start + w - SECONDS )) 26 sleep $(( timeout < 0 ? 0 : timeout )) 27done 28