Handling of prefix delegation when machine running dhcpy6d reboots

[FelixJacobi]

Scenario: I have the following class defined in dhcpy6d:

[class_fixed_dmz]
addresses = fixed fixed_ta
interface = dmz
nameserver = fd00::53
ntp_server = 2003:a:838:8f17::1 fd59:3f01:6a1e:2017::1
advertise = addresses prefixes
call_up = sudo /usr/sbin/dhcpy6d-add-route $prefix$/$length$ $router$ dmz
call_down = sudo /usr/sbin/dhcpy6d-del-route $prefix$/$length$ $router$ dmz
filter_mac = .*

and I am using the following script as hook for the class:

router.jacobi-bs.de ~ # cat =dhcpy6d-add-route 
#!/bin/sh
set -e

NAME="$(basename "$0")"

if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]
then
  echo "Usage: $NAME PREFIX GATEWAY IFACE" >&2
  exit 1
fi

{ printf "%s called with " "$NAME:"
  printf " \"%s\"\n" -- "$@";
} | logger -t "$NAME" --socket-errors=off

ip -6 route add "$1" via "$2" dev "$3"

The routes of course are only living in memory and therefore are lost when rebooting the machine. After rebooting my router, I noticed the following things:

• The machines which received prefixes started to renew the prefixes, but this did not lead to call_up being invoked again.
• Even if a renewal happens, you would need to wait until the prefix gets renewed, so that the route is set again.

Should

• a renew for the delegated prefix call call_down and call_up in that order to be able to set the routes for the delegated prefixes (again)?
• dhcpy6d (or dedicated script, which is invoked e.g. via a one-shot systemd unit) on boot call the hooks for all leased prefixes again assuming that there are used to set routes and those only exist in memory and therefore are no longer available after reboot?

[HenriWahl]

Did you set the option MANAGE_ROUTES_AT_START as in https://github.com/HenriWahl/dhcpy6d/blob/master/dhcpy6d/config.py#L218?

[FelixJacobi]

Ah, I didn't know that it actually exists. Will try that out.

[HenriWahl]

Can this issue be closed?

[FelixJacobi]

I think so. I had no time yet to test the option, but it looks to does the job for the case. If somethings needs to be changed, I will create a PR ;) .