No DHCPv6 lease neither IPv6-PD if leasetime < 12h

[vevere]

Hi,

If you reduce (with Lucy or on the /etc/config DHCP file) the lease time to anythin < 12h odhcpd don't affect any lease to any client (and no more IPv6-PD to any downstream router)

• tested on many routers (QCA, Rampis, X86_64) with OpenWRT > 20.x (21.02.0-rc* or any 21.* snapshot)
• reproductible :
  • yes, with any fresh install
  • no need to connect the WAN side
  • public scope not even needed, LUA is enough to reproduce
  • Under NetWork / Interface / LAN / DHCP Server set the Lease time to anything lower than 10h
  • on any LAN host : do an IP release/renew => you loose the GUA address
  • on any downstream OpenWRT router : restart the WAN interface => no more IPv6-PD on the WAN iface

Lease = 12h

Lease = 1h

[vevere]

Sorry for the typo:

• Under NetWork / Interface / LAN / DHCP Server set the Lease time to anything lower than 12h
  instead of
• Under NetWork / Interface / LAN / DHCP Server set the Lease time to anything lower than 10h

[dedeckeh]

Fixed in commit https://git.openwrt.org/?p=project/odhcpd.git;a=commit;h=bc9d317f2921ae6b529f2c9f8de79b75992e206f