IPv6 - LAN looses Prefix after link event

priller

2.1.1-PRERELEASE (amd64) (built Mar 6)
–--

Problem: When the LAN interface experiences a link down/up event. The IPv6 prefix assigned to the interface is lost. Only recovery is a system reboot (that I have found).

Details:

WAN: DHCPv6 Prefix Delegation size = /60
LAN (re0): IPv6 Prefix ID = 0

You can see the problem occurring in the routing.log below.

Note: The /60 does work. I have other OPT interfaces that get their prefix. Unique Prefix ID on each.

Steps to reproduce:

Just bounce the LAN interface.

Bug Filed: 3514

system.log
*** THE LINK BOUNCE EVENT ***
Mar  8 08:06:30 pfsense check_reload_status: Linkup starting re0
Mar  8 08:06:30 pfsense kernel: re0: link state changed to UP
Mar  8 08:06:33 pfsense php: rc.linkup: DEVD Ethernet attached event for lan
Mar  8 08:06:33 pfsense php: rc.linkup: HOTPLUG: Configuring interface lan
Mar  8 08:06:39 pfsense check_reload_status: updating dyndns lan
Mar  8 08:06:42 pfsense php: rc.dyndns.update: The command '/sbin/route change -inet6 default fe80::201:5cff:fe24:9301' returned exit code '1', the output was 'route: writing to routing socket: Network is unreachable route: writing to routing socket: Network is unreachable change net default: gateway fe80::201:5cff:fe24:9301: Network is unreachable' 
Mar  8 08:06:44 pfsense check_reload_status: Linkup starting re0
Mar  8 08:06:44 pfsense kernel: re0: link state changed to DOWN
Mar  8 08:06:47 pfsense php: rc.linkup: DEVD Ethernet detached event for lan
Mar  8 08:07:10 pfsense check_reload_status: Linkup starting re0
Mar  8 08:07:10 pfsense kernel: re0: link state changed to UP
Mar  8 08:07:13 pfsense php: rc.linkup: DEVD Ethernet attached event for lan
Mar  8 08:07:13 pfsense php: rc.linkup: HOTPLUG: Configuring interface lan
Mar  8 08:07:19 pfsense check_reload_status: updating dyndns lan
Mar  8 08:07:22 pfsense php: rc.dyndns.update: The command '/sbin/route change -inet6 default fe80::201:5cff:fe24:9301' returned exit code '1', the output was 'route: writing to routing socket: Network is unreachable route: writing to routing socket: Network is unreachable change net default: gateway fe80::201:5cff:fe24:9301: Network is unreachable'

routing.log
*** IPv6 PREFIX IS LOST ***
Mar  8 08:06:34 pfsense radvd[44420]: attempting to reread config file
Mar  8 08:06:34 pfsense radvd[44420]: no auto-selected prefix on interface re0, disabling advertisements
Mar  8 08:06:34 pfsense radvd[44420]: resuming normal operation
Mar  8 08:06:39 pfsense radvd[44420]: attempting to reread config file
Mar  8 08:06:39 pfsense radvd[44420]: no auto-selected prefix on interface re0, disabling advertisements
Mar  8 08:06:39 pfsense radvd[44420]: resuming normal operation
Mar  8 08:07:14 pfsense radvd[44420]: attempting to reread config file
Mar  8 08:07:14 pfsense radvd[44420]: no auto-selected prefix on interface re0, disabling advertisements
Mar  8 08:07:14 pfsense radvd[44420]: resuming normal operation
Mar  8 08:07:19 pfsense radvd[44420]: attempting to reread config file
Mar  8 08:07:19 pfsense radvd[44420]: no auto-selected prefix on interface re0, disabling advertisements
Mar  8 08:07:19 pfsense radvd[44420]: resuming normal operation

resolver.log
*** JUST INFORMATIONAL ***
Mar  8 08:06:36 pfsense dnsmasq[37539]: exiting on receipt of SIGTERM
Mar  8 08:06:37 pfsense dnsmasq[90864]: started, version 2.68 cachesize 10000
Mar  8 08:06:37 pfsense dnsmasq[90864]: compile time options: IPv6 GNU-getopt no-DBus i18n IDN DHCP DHCPv6 no-Lua TFTP no-conntrack no-ipset auth
Mar  8 08:06:37 pfsense dnsmasq[90864]: reading /etc/resolv.conf
Mar  8 08:06:37 pfsense dnsmasq[90864]: using nameserver 208.67.220.220#53
Mar  8 08:06:37 pfsense dnsmasq[90864]: using nameserver 208.67.222.222#53
Mar  8 08:06:37 pfsense dnsmasq[90864]: ignoring nameserver 127.0.0.1 - local interface
Mar  8 08:06:37 pfsense dnsmasq[90864]: read /etc/hosts - 28 addresses
Mar  8 08:07:16 pfsense dnsmasq[90864]: exiting on receipt of SIGTERM
Mar  8 08:07:17 pfsense dnsmasq[18998]: started, version 2.68 cachesize 10000
Mar  8 08:07:17 pfsense dnsmasq[18998]: compile time options: IPv6 GNU-getopt no-DBus i18n IDN DHCP DHCPv6 no-Lua TFTP no-conntrack no-ipset auth
Mar  8 08:07:17 pfsense dnsmasq[18998]: reading /etc/resolv.conf
Mar  8 08:07:17 pfsense dnsmasq[18998]: using nameserver 208.67.220.220#53
Mar  8 08:07:17 pfsense dnsmasq[18998]: using nameserver 208.67.222.222#53
Mar  8 08:07:17 pfsense dnsmasq[18998]: ignoring nameserver 127.0.0.1 - local interface
Mar  8 08:07:17 pfsense dnsmasq[18998]: read /etc/hosts - 28 addresses

eri--

Should be fixed on latest snapshots.

eri--

A different way to handle this has been committed.
Can you try with newer snapshots.

priller

** resolved **

The "just send a HUP to dhcp6 to get it to reload" change you checked in today is a good fix.

athurdent

When I set a LAN interface to track a DHCP6 WAN interface, a DHCPD is started with:

/usr/local/sbin/dhcpd -6 -user dhcpd -group _dhcp -chroot /var/dhcpd -cf /etc/dhcpdv6.conf -pf /var/run/dhcpdv6.pid em2

but there is no:

cat /etc/dhcpdv6.conf
cat: /etc/dhcpdv6.conf: No such file or directory

shouldn't it be started with:

-cf /var/dhcpd/etc/dhcpdv6.conf

that file has all the necessary info.
I'm on

2.1.1-PRERELEASE (amd64) 
built on Wed Mar 12 06:06:51 EDT 2014 
FreeBSD 8.3-RELEASE-p14

Edit:
forget it, I guess

-chroot /var/dhcpd

takes care of that and you have to use /etc/dhcpdv6.conf then.