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