`/etc/dhcp/dhclient-exit-hooks.d/ipv6` ```bash # To enable this script set the following variable to "yes" RUN="yes" interface_index=1 if [ "$RUN" != "yes" ]; then exit 0 fi if [ "$reason" != "BOUND6" ]; then exit 0 fi new_ipv6_gateway=$(curl -s http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$interface_index/gateway-ipv6 -H "Metadata-Flavor: Google") if [ -z "$(ip -6 route show default)" ]; then action=add else action=replace fi ip -6 route $action default via $new_ipv6_gateway dev $interface ``` Ref: - https://serverfault.com/a/528425/865075 - https://cloud.google.com/compute/docs/ip-addresses/configure-ipv6-address#ipv6-assignment - https://groups.google.com/g/ipv6hackers/c/zB527nJS1xI