6rd gateway lost upon ipv4 dhcp renewal

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btusi:
I recently upgraded from 22.1 to 22.7 by installing the new version on different hardware and then restoring a configuration backup. Since then, I'm running into an issue where, when my IPv4 DHCP address renews, my IPv6 default gateway is lost (`netstat -r` shows no default for IPv6). I can temporarily fix the issue by going to the Gateway page and saving the IPv6 gateway, but it dies again once the v4 DHCP is renewed. I found a few older issues on the forum for this, but nothing for this new version, and I believe it was working fine before.

Details:
My ISP has a few oddities:
* Service is provided on a VLAN (201)
* IPv4 is provided by standard DHCP. (PPPoE is not in the picture, unlike some older deployments in my area.)
* IPv6 is provided by a 6rd tunnel.

My relevant `ifconfig` interfaces:

vlan01: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
   description: WANQ
   options=4600703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,RXCSUM_IPV6,TXCSUM_IPV6,NOMAP>
   ether xx:xx:xx:xx:xx:xx
   inet6 fe80::20e:c4ff:fecf:101b%vlan01 prefixlen 64 scopeid 0x9
   inet x.x.x.x netmask 0xffffff00 broadcast x.x.x.x
   groups: vlan
   vlan: 201 vlanproto: 802.1q vlanpcp: 0 parent interface: igb0
   media: Ethernet autoselect (1000baseT <full-duplex>)
   status: active
   nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

wan_stf: flags=4041<UP,RUNNING,LINK2> metric 0 mtu 1280
   inet6 2602:x:x:x:: prefixlen 24
   groups: stf
   v4net x.x.x.x/0 -> tv4br x.x.x.x
   nd6 options=103<PERFORMNUD,ACCEPT_RTADV,NO_DAD>

Here's a log of what happens when the DHCP renews:

<13>1 2022-08-04T22:35:37-07:00 HOSTNAME dhclient 63160 - [meta sequenceId="1"] Creating resolv.conf
<11>1 2022-08-04T22:35:37-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="2"] /usr/local/etc/rc.newwanip: IPv4 renewal is starting on 'vlan01'
<11>1 2022-08-04T22:35:37-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="3"] /usr/local/etc/rc.newwanip: On (IP address: x.x.x.x) (interface: WANQ[wan]) (real interface: vlan01).
<13>1 2022-08-04T22:35:37-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="4"] plugins_configure hosts ()
<13>1 2022-08-04T22:35:37-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="5"] plugins_configure hosts (execute task : dnsmasq_hosts_generate())
<13>1 2022-08-04T22:35:37-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="6"] plugins_configure hosts (execute task : unbound_hosts_generate())
<11>1 2022-08-04T22:35:38-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="7"] /usr/local/etc/rc.newwanip: rd6 lan with ipv6 address 2602:x:x:x::1 based on wan ipv4 x.x.x.x
<13>1 2022-08-04T22:35:38-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="8"] plugins_configure dhcp (,inet6)
<13>1 2022-08-04T22:35:38-07:00 HOSTNAME opnsense 65921 - [meta sequenceId="9"] plugins_configure dhcp (execute task : dhcpd_dhcp_configure(,inet6))

And here's what happens when I save the gateway:

<13>1 2022-08-04T22:40:44-07:00 HOSTNAME configctl 59042 - [meta sequenceId="1"] event @ 1659678044.16 msg: Aug 4 22:40:44 HOSTNAME config[9866]: [2022-08-04T22:40:44-07:00][INFO] config-event: new_config /conf/backup/config-1659678044.1539.xml
<13>1 2022-08-04T22:40:44-07:00 HOSTNAME configctl 59042 - [meta sequenceId="2"] event @ 1659678044.16 exec: system event config_changed
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="3"] /system_gateways.php: ROUTING: entering configure using defaults
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="4"] /system_gateways.php: ROUTING: IPv4 default gateway set to wan
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="5"] /system_gateways.php: ROUTING: setting IPv4 default route to x.x.x.x
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="6"] /system_gateways.php: ROUTING: keeping current default gateway 'x.x.x.x'
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="7"] /system_gateways.php: ROUTING: IPv6 default gateway set to wan
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="8"] /system_gateways.php: ROUTING: setting IPv6 default route to 2602::x.x.x.x
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="9"] /system_gateways.php: ROUTING: removing /tmp/vlan01_defaultgwv6
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="10"] /system_gateways.php: ROUTING: removing /tmp/wan_stf_defaultgwv6
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="11"] /system_gateways.php: ROUTING: creating /tmp/wan_stf_defaultgwv6 using '2602::x.x.x.x'
<13>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="12"] plugins_configure monitor ()
<13>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="13"] plugins_configure monitor (execute task : dpinger_configure_do())
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="14"] /system_gateways.php: The WANQ_6RD monitor address is empty, skipping.
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="15"] /system_gateways.php: The WANQ_DHCP monitor address is empty, skipping.
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 9866 - [meta sequenceId="16"] /system_gateways.php: The WANV_4 monitor address is empty, skipping.
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 67867 - [meta sequenceId="17"] /usr/local/etc/rc.filter_configure: ROUTING: keeping current default gateway 'x.x.x.x'
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 67867 - [meta sequenceId="18"] /usr/local/etc/rc.filter_configure: ROUTING: removing /tmp/wan_stf_defaultgwv6
<11>1 2022-08-04T22:40:46-07:00 HOSTNAME opnsense 67867 - [meta sequenceId="19"] /usr/local/etc/rc.filter_configure: ROUTING: creating /tmp/vlan01_defaultgwv6 using '2602::x.x.x.x'

I also have both a /tmp/vlan01_defaultgwv6 and a /tmp/wan_stf_defaultgwv6.

I admit PHP's not something I've used professionally (just some personal stuff like 20 years ago), so I'm looking into this myself but haven't found the bug quite yet. Any ideas?

franco:
The DHCP renewal makes me suspicious so please check these two patches mentioned here first:

https://forum.opnsense.org/index.php?topic=29556.msg143071#msg143071

Cheers,
Franco

btusi:
I applied both, and it seems to have mitigated the issue. Looking at the contents of bb4743a7322, it appears that it just made it so I don't lose the gateway every few minutes when I do a renewal, but if my ISP decides to change my IP I'll lose the gateway again. Luckily, I don't think I know of any time that's changed without me explicitly releasing/renewing, so I'll just keep my workaround in mind if it breaks again.

Thanks for the quick response!

franco:
Thanks for the additional info.

While you are here you can break this simply by issuing

# /usr/local/etc/rc.newwanip vlan01

as is, correct?

And it starts working if you clear the cached IP first?

# rm /tmp/vlan01_oldip
# /usr/local/etc/rc.newwanip vlan01

Cheers,
Franco

btusi:
Yes, that's correct:

root@HOSTNAME:/var/log # netstat -rn | grep default
default x.x.x.x UGS vlan01
default 2602::x:x UGS wan_stf
root@HOSTNAME:/var/log # /usr/local/etc/rc.newwanip vlan01
root@HOSTNAME:/var/log # netstat -rn | grep default
default x.x.x.x UGS vlan01
root@HOSTNAME:/var/log # rm /tmp/vlan01_oldip
root@HOSTNAME:/var/log # /usr/local/etc/rc.newwanip vlan01
root@HOSTNAME:/var/log # netstat -rn | grep default
default x.x.x.x UGS vlan01
default 2602::x:x UGS wan_stf

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