<![CDATA[IPv6 when LAN goes down]]>Hello,

So I have the following setup: PPPoE, with IPv4 and IPv6 (via DHCP6).
I get a /56 from the ISP which I further push to the lan/vlan clients using DHCPv6 and/or SLAAC.
Everything works great, up until a certain point.
So because of the vlans, of course I had to use managed switches. But, those switches update themselves from time to time. When they do, they reboot, and if it's the one connected to the pfsense box that reboots (main switch), IPv6 goes down, on all interfaces and clients, and never comes back.
To fix, I need to disconnect the WAN and reconnect. Is this the normal behavior? Am I missing something?

Thank you in advance for any feedback.
Peter

]]>https://forum.netgate.com/topic/160108/ipv6-when-lan-goes-downRSS for NodeMon, 13 Apr 2026 23:09:07 GMTFri, 22 Jan 2021 00:11:02 GMT60<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 19:28:19 GMT]]>@gertjan said in IPv6 when LAN goes down:

@peter-fyri

Like https://redmine.pfsense.org/issues/10966 ?

Right :)
Well, it sounds very similar to my issue, it's just the trigger that it's different, but with the same effect.

Thank you :)

]]>https://forum.netgate.com/post/958638https://forum.netgate.com/post/958638Fri, 22 Jan 2021 19:28:19 GMT<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 11:16:14 GMT]]>@peter-fyri

Like https://redmine.pfsense.org/issues/10966 ?

]]>https://forum.netgate.com/post/958503https://forum.netgate.com/post/958503Fri, 22 Jan 2021 11:16:14 GMT<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 10:46:23 GMT]]>@gertjan said in IPv6 when LAN goes down:

@peter-fyri said in IPv6 when LAN goes down:

I also have pfblocker-ng and suricata active, 3 VLANs and OpenVPN.

These have nothing to do with loosing IPv6 on LAN.

@peter-fyri said in IPv6 when LAN goes down:

Anyway, is your WAN also PPPoE?

In the past, when my ISP was using vanilla PPPoE, I preferred to use a modem, and have pfSense doing PPPoE, but that's not possible any more as they 'upgraded' to a non-standard VDSL.

I'm loosing IPv6 everywhere, not just LAN, but also on WAN.
pfSense is doing the PPPoE part on my box, basically the GPON is just a fiber to ethernet converter (because the line is FTTH), so the WAN of pfSense is receiving my public IPv4 and IPv6 via PPPoE from the ISP.

]]>https://forum.netgate.com/post/958499https://forum.netgate.com/post/958499Fri, 22 Jan 2021 10:46:23 GMT<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 10:30:20 GMT]]>@peter-fyri said in IPv6 when LAN goes down:

I also have pfblocker-ng and suricata active, 3 VLANs and OpenVPN.

These have nothing to do with loosing IPv6 on LAN.

@peter-fyri said in IPv6 when LAN goes down:

Anyway, is your WAN also PPPoE?

In the past, when my ISP was using vanilla PPPoE, I preferred to use a modem, and have pfSense doing PPPoE, but that's not possible any more as they 'upgraded' to a non-standard VDSL.

]]>https://forum.netgate.com/post/958495https://forum.netgate.com/post/958495Fri, 22 Jan 2021 10:30:20 GMT<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 08:37:37 GMT]]>@gertjan said in IPv6 when LAN goes down:

@peter-fyri said in IPv6 when LAN goes down:

To fix, I need to disconnect the WAN and reconnect

That's exactly the same thing as the rebooting of the switch, which will also introduce a temporary disconnect on all ports.
What is this for a switch that needs to do an uncontrolled reboot ??
I'm not using managed switches myself, but when I take out the power of my main switch and restore it, I do see a storm of DHCP 4&6 activity, but it won't break IPv6.

It is controlled. It is scheduled, it is not doing any updates/reboots whenever it wants.
It might be an important information, I also have pfblocker-ng and suricata active, 3 VLANs and OpenVPN.
Anyway, is your WAN also PPPoE?

Thank you.

]]>https://forum.netgate.com/post/958476https://forum.netgate.com/post/958476Fri, 22 Jan 2021 08:37:37 GMT<![CDATA[Reply to IPv6 when LAN goes down on Fri, 22 Jan 2021 07:37:24 GMT]]>@peter-fyri said in IPv6 when LAN goes down:

To fix, I need to disconnect the WAN and reconnect

That's exactly the same thing as the rebooting of the switch, which will also introduce a temporary disconnect on all ports.
What is this for a switch that needs to do an uncontrolled reboot ??
I'm not using managed switches myself, but when I take out the power of my main switch and restore it, I do see a storm of DHCP 4&6 activity, but it won't break IPv6.

]]>https://forum.netgate.com/post/958468https://forum.netgate.com/post/958468Fri, 22 Jan 2021 07:37:24 GMT