Local ISP weird behaviour w/ IPv6 via DHCP6

YoLo88

And here are the logs for 10 minutes later when the IPv6 is dropped and the Interface never recovers -

System Logs

Jul 16 17:36:41	rc.gateway_alarm	99403	>>> Gateway alarm: WAN_DHCP6 (Addr:[fe80::xxx:xxxx:xxxx:xxxx]%pppoe0 Alarm:1 RTT:1.447ms RTTsd:.421ms Loss:21%)
Jul 16 17:36:41	check_reload_status	439	updating dyndns WAN_DHCP6
Jul 16 17:36:41	check_reload_status	439	Restarting IPsec tunnels
Jul 16 17:36:41	check_reload_status	439	Restarting OpenVPN tunnels/interfaces
Jul 16 17:36:41	check_reload_status	439	Reloading filter
Jul 16 17:38:33	rtsold	98738	Received RA specifying route [fe80::xxx:xxxx:xxxx:xxxx] for interface wan(pppoe0)
Jul 16 17:38:34	php-fpm	45454	/rc.newwanipv6: rc.newwanipv6: Info: starting on pppoe0.
Jul 16 17:38:34	php-fpm	45454	/rc.newwanipv6: rc.newwanipv6: on (IP address: [NEW IPv6 Address]) (interface: wan) (real interface: pppoe0).
Jul 16 17:38:35	check_reload_status	439	Reloading filter
Jul 16 17:38:35	php-fpm	45454	/rc.newwanipv6: The command '/sbin/ifconfig pppoe0 inet6 [OLD IPv6 Address] delete' returned exit code '1', the output was 'ifconfig: ioctl (SIOCDIFADDR): Can't assign requested address'
Jul 16 17:38:35	php-fpm	45454	/rc.newwanipv6: Resyncing OpenVPN instances for interface WAN.
Jul 16 17:38:35	php-fpm	45454	/rc.newwanipv6: Creating rrd update script
Jul 16 17:38:35	php-fpm	45454	/rc.newwanipv6: pfSense package system has detected an IP change or dynamic WAN reconnection - [OLD IPv6 Address] -> [NEW IPv6 Address] - Restarting packages.
Jul 16 17:38:35	check_reload_status	439	Starting packages
Jul 16 17:38:35	check_reload_status	439	Reloading filter
Jul 16 17:38:36	php-fpm	399	/rc.start_packages: Restarting/Starting all packages.
Jul 16 17:38:36	php-fpm	399	/rc.start_packages: Configuration Change: (system): pfBlockerNG: saving DNSBL changes
Jul 16 17:38:36	check_reload_status	439	Syncing firewall
Jul 16 17:38:37	tail_pfb	73078	[pfBlockerNG] Firewall Filter Service stopped
Jul 16 17:38:37	php_pfb	74496	[pfBlockerNG] filterlog daemon stopped
Jul 16 17:38:37	tail_pfb	82097	[pfBlockerNG] Firewall Filter Service started
Jul 16 17:38:37	php_pfb	82636	[pfBlockerNG] filterlog daemon started
Jul 16 17:38:46	rtsold	54756	Received RA specifying route [fe80::xxx:xxxx:xxxx:xxxx] for interface wan(pppoe0)
Jul 16 17:38:47	php-fpm	38529	/rc.newwanipv6: rc.newwanipv6: Info: starting on pppoe0.
Jul 16 17:38:47	php-fpm	38529	/rc.newwanipv6: rc.newwanipv6: on (IP address: [NEW IPv6 Address]) (interface: wan) (real interface: pppoe0).
Jul 16 17:38:48	check_reload_status	439	Reloading filter
Jul 16 17:38:48	php-fpm	38529	/rc.newwanipv6: Resyncing OpenVPN instances for interface WAN.
Jul 16 17:38:48	check_reload_status	439	Reloading filter

DHCP6c Debug Logs:

Jul 16 17:31:25	dhcp6c	93453	IA timeout for NA-0, state=ACTIVE
Jul 16 17:31:25	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=0, retrans=10256
Jul 16 17:31:25	dhcp6c	93453	Sending Renew
Jul 16 17:31:25	dhcp6c	93453	a new XID (9e65a3) is generated
Jul 16 17:31:25	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:25	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:25	dhcp6c	93453	set IA address
Jul 16 17:31:25	dhcp6c	93453	set identity association
Jul 16 17:31:25	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:25	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:25	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:25	dhcp6c	93453	IA timeout for PD-0, state=ACTIVE
Jul 16 17:31:25	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=0, retrans=10244
Jul 16 17:31:25	dhcp6c	93453	Sending Renew
Jul 16 17:31:25	dhcp6c	93453	a new XID (4cb9b4) is generated
Jul 16 17:31:25	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:25	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:25	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:25	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:25	dhcp6c	93453	set IA_PD prefix
Jul 16 17:31:25	dhcp6c	93453	set IA_PD
Jul 16 17:31:25	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:35	dhcp6c	93453	Sending Renew
Jul 16 17:31:35	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:35	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:35	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:35	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:35	dhcp6c	93453	set IA_PD prefix
Jul 16 17:31:35	dhcp6c	93453	set IA_PD
Jul 16 17:31:35	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:35	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=1, retrans=20034
Jul 16 17:31:35	dhcp6c	93453	Sending Renew
Jul 16 17:31:35	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:35	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:35	dhcp6c	93453	set IA address
Jul 16 17:31:35	dhcp6c	93453	set identity association
Jul 16 17:31:35	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:35	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:35	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:35	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=1, retrans=20708
Jul 16 17:31:56	dhcp6c	93453	Sending Renew
Jul 16 17:31:56	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:56	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:56	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:56	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:56	dhcp6c	93453	set IA_PD prefix
Jul 16 17:31:56	dhcp6c	93453	set IA_PD
Jul 16 17:31:56	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:56	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=2, retrans=39893
Jul 16 17:31:56	dhcp6c	93453	Sending Renew
Jul 16 17:31:56	dhcp6c	93453	set client ID (len 14)
Jul 16 17:31:56	dhcp6c	93453	set server ID (len 10)
Jul 16 17:31:56	dhcp6c	93453	set IA address
Jul 16 17:31:56	dhcp6c	93453	set identity association
Jul 16 17:31:56	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:31:56	dhcp6c	93453	set option request (len 4)
Jul 16 17:31:56	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:31:56	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=2, retrans=40140
Jul 16 17:32:35	dhcp6c	93453	Sending Renew
Jul 16 17:32:35	dhcp6c	93453	set client ID (len 14)
Jul 16 17:32:35	dhcp6c	93453	set server ID (len 10)
Jul 16 17:32:35	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:32:35	dhcp6c	93453	set option request (len 4)
Jul 16 17:32:35	dhcp6c	93453	set IA_PD prefix
Jul 16 17:32:35	dhcp6c	93453	set IA_PD
Jul 16 17:32:35	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:32:35	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=3, retrans=80895
Jul 16 17:32:36	dhcp6c	93453	Sending Renew
Jul 16 17:32:36	dhcp6c	93453	set client ID (len 14)
Jul 16 17:32:36	dhcp6c	93453	set server ID (len 10)
Jul 16 17:32:36	dhcp6c	93453	set IA address
Jul 16 17:32:36	dhcp6c	93453	set identity association
Jul 16 17:32:36	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:32:36	dhcp6c	93453	set option request (len 4)
Jul 16 17:32:36	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:32:36	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=3, retrans=77269
Jul 16 17:33:54	dhcp6c	93453	Sending Renew
Jul 16 17:33:54	dhcp6c	93453	set client ID (len 14)
Jul 16 17:33:54	dhcp6c	93453	set server ID (len 10)
Jul 16 17:33:54	dhcp6c	93453	set IA address
Jul 16 17:33:54	dhcp6c	93453	set identity association
Jul 16 17:33:54	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:33:54	dhcp6c	93453	set option request (len 4)
Jul 16 17:33:54	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:33:54	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=4, retrans=155001
Jul 16 17:33:56	dhcp6c	93453	Sending Renew
Jul 16 17:33:56	dhcp6c	93453	set client ID (len 14)
Jul 16 17:33:56	dhcp6c	93453	set server ID (len 10)
Jul 16 17:33:56	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:33:56	dhcp6c	93453	set option request (len 4)
Jul 16 17:33:56	dhcp6c	93453	set IA_PD prefix
Jul 16 17:33:56	dhcp6c	93453	set IA_PD
Jul 16 17:33:56	dhcp6c	93453	send renew to ff02::1:2%pppoe0
Jul 16 17:33:56	dhcp6c	93453	reset a timer on pppoe0, state=RENEW, timeo=4, retrans=154040
Jul 16 17:34:25	dhcp6c	93453	IA timeout for NA-0, state=RENEW
Jul 16 17:34:25	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=0, retrans=9245
Jul 16 17:34:25	dhcp6c	93453	Sending Rebind
Jul 16 17:34:25	dhcp6c	93453	a new XID (4e5a83) is generated
Jul 16 17:34:25	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:25	dhcp6c	93453	set IA address
Jul 16 17:34:25	dhcp6c	93453	set identity association
Jul 16 17:34:25	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:25	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:25	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:25	dhcp6c	93453	IA timeout for PD-0, state=RENEW
Jul 16 17:34:25	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=0, retrans=9832
Jul 16 17:34:25	dhcp6c	93453	Sending Rebind
Jul 16 17:34:25	dhcp6c	93453	a new XID (b44aee) is generated
Jul 16 17:34:25	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:25	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:25	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:25	dhcp6c	93453	set IA_PD prefix
Jul 16 17:34:25	dhcp6c	93453	set IA_PD
Jul 16 17:34:25	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:34	dhcp6c	93453	Sending Rebind
Jul 16 17:34:34	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:34	dhcp6c	93453	set IA address
Jul 16 17:34:34	dhcp6c	93453	set identity association
Jul 16 17:34:34	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:34	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:34	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:34	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=1, retrans=18333
Jul 16 17:34:35	dhcp6c	93453	Sending Rebind
Jul 16 17:34:35	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:35	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:35	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:35	dhcp6c	93453	set IA_PD prefix
Jul 16 17:34:35	dhcp6c	93453	set IA_PD
Jul 16 17:34:35	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:35	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=1, retrans=18742
Jul 16 17:34:53	dhcp6c	93453	Sending Rebind
Jul 16 17:34:53	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:53	dhcp6c	93453	set IA address
Jul 16 17:34:53	dhcp6c	93453	set identity association
Jul 16 17:34:53	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:53	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:53	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:53	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=2, retrans=36526
Jul 16 17:34:54	dhcp6c	93453	Sending Rebind
Jul 16 17:34:54	dhcp6c	93453	set client ID (len 14)
Jul 16 17:34:54	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:34:54	dhcp6c	93453	set option request (len 4)
Jul 16 17:34:54	dhcp6c	93453	set IA_PD prefix
Jul 16 17:34:54	dhcp6c	93453	set IA_PD
Jul 16 17:34:54	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:34:54	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=2, retrans=37305
Jul 16 17:35:29	dhcp6c	93453	Sending Rebind
Jul 16 17:35:29	dhcp6c	93453	set client ID (len 14)
Jul 16 17:35:29	dhcp6c	93453	set IA address
Jul 16 17:35:29	dhcp6c	93453	set identity association
Jul 16 17:35:29	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:35:29	dhcp6c	93453	set option request (len 4)
Jul 16 17:35:29	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:35:29	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=3, retrans=69545
Jul 16 17:35:31	dhcp6c	93453	Sending Rebind
Jul 16 17:35:31	dhcp6c	93453	set client ID (len 14)
Jul 16 17:35:31	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:35:31	dhcp6c	93453	set option request (len 4)
Jul 16 17:35:31	dhcp6c	93453	set IA_PD prefix
Jul 16 17:35:31	dhcp6c	93453	set IA_PD
Jul 16 17:35:31	dhcp6c	93453	send rebind to ff02::1:2%pppoe0
Jul 16 17:35:31	dhcp6c	93453	reset a timer on pppoe0, state=REBIND, timeo=3, retrans=77631

[From here is almost 10 minutes (9 minutes and 54s) from when the previous lease was acquired]
Jul 16 17:36:25	dhcp6c	93453	address timeout for [OLD IPv6 Address]
Jul 16 17:36:25	dhcp6c	93453	remove an address [OLD IPv6 Address]
Jul 16 17:36:25	dhcp6c	93453	remove an address [OLD IPv6 Address]/128 on pppoe0
Jul 16 17:36:25	dhcp6c	93453	IA NA-0 is invalidated
Jul 16 17:36:25	dhcp6c	93453	remove an IA: NA-0
Jul 16 17:36:25	dhcp6c	93453	reset a timer on pppoe0, state=INIT, timeo=0, retrans=288
Jul 16 17:36:25	dhcp6c	93453	prefix timeout for [IPv6 Delegated Prefix]::/64
Jul 16 17:36:25	dhcp6c	93453	remove a site prefix [IPv6 Delegated Prefix]::/64
Jul 16 17:36:25	dhcp6c	93453	IA PD-0 is invalidated
Jul 16 17:36:25	dhcp6c	93453	remove an IA: PD-0
Jul 16 17:36:25	dhcp6c	93453	reset a timer on pppoe0, state=INIT, timeo=0, retrans=843
Jul 16 17:36:26	dhcp6c	93453	Sending Solicit
Jul 16 17:36:26	dhcp6c	93453	a new XID (c66ca2) is generated
Jul 16 17:36:26	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:26	dhcp6c	93453	set identity association
Jul 16 17:36:26	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:26	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:26	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:26	dhcp6c	93453	set IA_PD
Jul 16 17:36:26	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:26	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=0, retrans=1071
Jul 16 17:36:26	dhcp6c	93453	Sending Solicit
Jul 16 17:36:26	dhcp6c	93453	a new XID (318b1c) is generated
Jul 16 17:36:26	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:26	dhcp6c	93453	set identity association
Jul 16 17:36:26	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:26	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:26	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:26	dhcp6c	93453	set IA_PD
Jul 16 17:36:26	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:26	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=0, retrans=1024
Jul 16 17:36:27	dhcp6c	93453	Sending Solicit
Jul 16 17:36:27	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:27	dhcp6c	93453	set identity association
Jul 16 17:36:27	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:27	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:27	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:27	dhcp6c	93453	set IA_PD
Jul 16 17:36:27	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:27	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=1, retrans=2222
Jul 16 17:36:27	dhcp6c	93453	Sending Solicit
Jul 16 17:36:27	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:27	dhcp6c	93453	set identity association
Jul 16 17:36:27	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:27	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:27	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:27	dhcp6c	93453	set IA_PD
Jul 16 17:36:27	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:27	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=1, retrans=1992
Jul 16 17:36:29	dhcp6c	93453	all information to be updated was canceled
Jul 16 17:36:29	dhcp6c	93453	removing an event on pppoe0, state=RENEW
Jul 16 17:36:29	dhcp6c	93453	Sending Solicit
Jul 16 17:36:29	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:29	dhcp6c	93453	set identity association
Jul 16 17:36:29	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:29	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:29	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:29	dhcp6c	93453	set IA_PD
Jul 16 17:36:29	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:29	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=2, retrans=4305
Jul 16 17:36:29	dhcp6c	93453	Sending Solicit
Jul 16 17:36:29	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:29	dhcp6c	93453	set identity association
Jul 16 17:36:29	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:29	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:29	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:29	dhcp6c	93453	set IA_PD
Jul 16 17:36:29	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:29	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=2, retrans=3810
Jul 16 17:36:30	dhcp6c	93453	all information to be updated was canceled
Jul 16 17:36:30	dhcp6c	93453	removing an event on pppoe0, state=RENEW
Jul 16 17:36:33	dhcp6c	93453	Sending Solicit
Jul 16 17:36:33	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:33	dhcp6c	93453	set identity association
Jul 16 17:36:33	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:33	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:33	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:33	dhcp6c	93453	set IA_PD
Jul 16 17:36:33	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:33	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=3, retrans=7611
Jul 16 17:36:33	dhcp6c	93453	Sending Solicit
Jul 16 17:36:33	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:33	dhcp6c	93453	set identity association
Jul 16 17:36:33	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:33	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:33	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:33	dhcp6c	93453	set IA_PD
Jul 16 17:36:33	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:33	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=3, retrans=8876
Jul 16 17:36:39	dhcp6c	93453	all information to be updated was canceled
Jul 16 17:36:39	dhcp6c	93453	removing an event on pppoe0, state=REBIND
Jul 16 17:36:41	dhcp6c	93453	Sending Solicit
Jul 16 17:36:41	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:41	dhcp6c	93453	set identity association
Jul 16 17:36:41	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:41	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:41	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:41	dhcp6c	93453	set IA_PD
Jul 16 17:36:41	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:41	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=4, retrans=15518
Jul 16 17:36:42	dhcp6c	93453	Sending Solicit
Jul 16 17:36:42	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:42	dhcp6c	93453	set identity association
Jul 16 17:36:42	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:42	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:42	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:42	dhcp6c	93453	set IA_PD
Jul 16 17:36:42	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:42	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=4, retrans=17814
Jul 16 17:36:49	dhcp6c	93453	all information to be updated was canceled
Jul 16 17:36:49	dhcp6c	93453	removing an event on pppoe0, state=REBIND
Jul 16 17:36:56	dhcp6c	93453	Sending Solicit
Jul 16 17:36:56	dhcp6c	93453	set client ID (len 14)
Jul 16 17:36:56	dhcp6c	93453	set identity association
Jul 16 17:36:56	dhcp6c	93453	set elapsed time (len 2)
Jul 16 17:36:56	dhcp6c	93453	set option request (len 4)
Jul 16 17:36:56	dhcp6c	93453	set IA_PD prefix
Jul 16 17:36:56	dhcp6c	93453	set IA_PD
Jul 16 17:36:56	dhcp6c	93453	send solicit to ff02::1:2%pppoe0
Jul 16 17:36:56	dhcp6c	93453	reset a timer on pppoe0, state=SOLICIT, timeo=5, retrans=32179
Jul 16 17:37:00	dhcp6c	93453	Sending Solicit
Jul 16 17:37:00	dhcp6c	93453	set client ID (len 14)
Jul 16 17:37:00	dhcp6c	93453	set identity association

YoLo88

I've tried turning off gateway monitoring and that didn't make a difference.

Gertjan

here you were inserting this line :

@YoLo88 said in Local ISP weird behaviour w/ IPv6 via DHCP6:

[From here is almost 10 minutes (9 minutes and 54s) from when the previous lease was acquired]

the logs were still showing showing that the dhcp6c client was trying hard to get a DHCP6 lease.
First 4 x times a time out while in RENEW mode. RENEW means here : the dhcp6c client ask for a renewal of the info (lease) it already has. This is the normal sequence. See below for what I have.

Then, after several falures (probably : no answer from the server) it start to go one level lower, and rebuild the entire connection, it enters the REBIND phase, which means : it will ask for an all new DHCP6 lease. If that is done every 10 minutes, then that is pretty in the IPv4 days.

You didn't show the log lines where it eventually got eventually a valid DHCP6 lease ?
It was already on the third retry when REBINDing .....

If this happens with IPv6, then consider that catastrophic. Changing IPv6 WAN info (and prefixes for the LAns) every 10 minutes == not good.

Renewing the DHCP6 info on WAN every 10 minutes isn't unusual, though.
Here are mine :

That's every 5 minutes ! (so lucky you).
But fater 5 minutes the dhcp6c client did got an answer from my upstream DHCP6 server (it 'lives' in my ISP router box, 50 cm away from pfSense).
I cant' tell why this need to be done every 5 minutes, but ok, guess I have to hit the "learn" button in a nearby future ;)

Your issue is : it managed to get a 10 minutes DHCP6 lease ones.
And renewal is nearly impossible ....

Is it something like : after the DHPC6 lease duration time out this also impacts the lower level connection : the pppoe link ? If something happens with the pppoe link, then yeah, DHCP6 won't work, the server can't be reached, it will try, retry retyr up until the pppoe comes back again, and so on.
I'm just brainstorming here.

YoLo88

@Gertjan said in Local ISP weird behaviour w/ IPv6 via DHCP6:

You didn't show the log lines where it eventually got eventually a valid DHCP6 lease ?

Thank you very much for your response!!

Those were the first set of logs @17:26. It only get's a valid IPv6 lease if I disconnect/reconnect the WAN interface via the WebUI. And it reliably does get an IPv6 address every time I do this. and then.... 10 minutes later it drops and never recovers.

This must be a setting somewhere to replicate how the Fritz box was getting IPv6 because that would ... just ... work.

YoLo88

@YoLo88 said in Local ISP weird behaviour w/ IPv6 via DHCP6:

send renew to ff02::1:2%pppoe0

Is the problem this PPPoE IPv6 address - "ff02::1:2%pppoe0"

Jul 18 09:57:49	dhcp6c	86580	Sending Solicit
Jul 18 09:57:49	dhcp6c	86580	set client ID (len 14)
Jul 18 09:57:49	dhcp6c	86580	set identity association
Jul 18 09:57:49	dhcp6c	86580	set elapsed time (len 2)
Jul 18 09:57:49	dhcp6c	86580	set option request (len 4)
Jul 18 09:57:49	dhcp6c	86580	set IA_PD prefix
Jul 18 09:57:49	dhcp6c	86580	set IA_PD
Jul 18 09:57:49	dhcp6c	86580	send solicit to ff02::1:2%pppoe0
Jul 18 09:57:49	dhcp6c	86580	reset a timer on pppoe0, state=SOLICIT, timeo=1135, retrans=108036

Where the hell does that come from? I can't ping it and it doesn't look like it relates to either the fe80 link local addressing or real IPv6 addressing that I'm getting from my ISP...

YoLo88

Ahh, FF02::1 is Link-local multicast address All nodes (broadcast)

Gertjan

@YoLo88

As this is IPV6 and IPv4 over PPPoE, did you set a MTU value less then 1500 ?

This one :

@YoLo88 said in Local ISP weird behaviour w/ IPv6 via DHCP6:

Jul 16 17:36:41 rc.gateway_alarm 99403 >>> Gateway alarm: WAN_DHCP6 (Addr:[fe80::xxx:xxxx:xxxx:xxxx]%pppoe0 Alarm:1 RTT:1.447ms RTTsd:.421ms Loss:21%)

is strange.
When the 10 minute DHCP6 lease is over, the IP6 info is still valid. Lease renewal starts to happen half way the lease duration. That is, DHCP4 works like that. When a device receives a DHCP4 lease valid for 6 hours, renewal start at 3 hours.
If that is the same for IPv6, then why ..... there is a gateway alarm = ping6 doesn't pass anymore.
I'm pretty sure that has nothing to do with the DHCP6 lease renewal.
Was the pppoe interface already reset before that gateway alarm line .
The pppoe connection itself went bad ? The pppoe renewal is a slow process. And while that's in progress, the IPv6 that goes over it can't be created.

Does the IPv4 use the same pppoe connection ? IPv4 doesn't complain / stays in a working condition ?

I'm just brainstorming here. It's years now my ISP left pppoe for what is was : perfect for the waste bin.

YoLo88

@Gertjan Thanks again for your input. Much appreciated.

The MTU appears to set itself to 1492

I tried disabling gateway monitoring but it didn't make any difference.

IPv4 and IPv6 are sharing the same PPPoE connection yes, I have the "Use IPv4 connectivity as parent interface" - "Request a IPv6 prefix/information through the IPv4 connectivity link" option ticked and yes IPv4 is fine. It renews without a problem.

My ISP is garbage for tech support. I can't get anyone even remotely technical to speak to me. They just tell me to put the Fritz box back on there or it's my problem to figure out which is kind of fair enough. This IPv6 connection is stable on Fritzbox but not on PFSense. Therefore, it must be a setting in PFSense that I can tweak to fix the stability.

YoLo88

What about https://redmine.pfsense.org/issues/13237 ? Some notes in there about strange behaviour that happens repeatedly unless the firewall is physically rebooted? Going to give it a cold boot now and see how that goes...

YoLo88

Aaaaaaand 13 minutes of uptime and IPv6 is still stable!

alt text

YoLo88

And it lasted about 50 minutes before it died and didn't recover again. So, better but still not great.

Gertjan

@YoLo88

So it did renew 4 times at least, and failed to do so the 5th time ?

YoLo88

Looks like I was lacking "rapid commit" under advanced IP options. I tried to post instructions here but it keeps getting flagged as Spam. Check out https://www.reddit.com/r/PFSENSE/comments/1duuc6o/ipv6_troubles_unstable_pppoe_ipv6_address_via/ for the full post.