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Took forever to figure this out, but it ended up being bad memory. Replaced the RAM, now running rock solid. Just throwing this here in case someone else is running into similar symptoms.

I'm experiencing issues where my internet is dropping sporadically. Sometimes there are weeks in between outages and other times the drops occur multiple times per day. I initially attributed this activity to the ISP.

However, during these outages, my opnsense router is completely unresponsive (I cannot access the web interface, it does not respond to ping, etc). While opnsense is unresponsive, I can access other devices on the local network (meaning my switching equipment seems fine). Now, I'm beginning to wonder if, instead of an ISP issue, opnsense is failing somehow and not routing any traffic.

I've looked through logs and cannot find anything definitive. I would greatly appreciate some help in trouble-shooting/resolving these issues.

Thank you!

ISP delegation is DHCP

Instead of "Track Interface"?

Meaning... set the IPv6 configuration type to "Static IPv6" and then assign an address?

For the checkbox go to Interfaces->[LAN] and then scroll to the very bottom. That's where I see that checkbox. I'm running 22.1.

I'm not currently using DHCPv6. The service is definitely not running.

If I go to Services->Router Advertisements->[LAN], there is where I'm setting the following:
Router Adv: Unmanaged
Router Priority: Normal
Source Address: Automatic
Advertise Routes:
     Prefix: [EMPTY], Length: 128

Do I need to put something in prefix or does it do that automatically (I'm assuming automatically)?

I've watched radvd output for sometime and never seen an advertisement other than WAN.

Lastly, the IPv6 Configuration Type under Interfaces->[LAN] is set to "Track Interface".

Again, your help is much appreciated - thank you!

You have to enable the checkbox in the screenshot I sent before "Router Advertisements" service is listed there.

In radvdump output I see advertisements every few seconds from by WAN interface. Is that what is expected?

Thank you kindly for your help!

I set my pihole IP as DNS, but ipconfig /all never updates to that address.

Old thread, but I was following this.

I have found that if I make any changes to radvd settings IPv6 quits working on Windows 10 (and possibly elsewhere). Any attempt to renew6 leads to the following error message.

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An error occurred while renewing interface Ethernet : The semaphore timeout period has expired.

I was referring to the setting shown in the attached image (bottom of the page on Interfaces -> [LAN])

I'm guessing you needed to enable manual mode to get that to work?

This may be outdated, but I'm loosely following this to get DHCPv6 running in order to assign DNS for my pihole. However, after enabling Manual configuration and turning on DHCPv6 Windows 10 will no longer pull an IPv6 address. What's odd, is that it seemed somewhat borked in a fresh/default install of opnsense.

It's definitely broken with DHCPv6 enabled. Running ipconfig /renew6 returns this

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An error occurred while renewing interface Ethernet : The cluster resource is not available.

Googling that I find nothing. Googling DHCPv6 setup on opnsense, I find a ton of folks having similar issues. I would greatly appreciate help in understanding what is going on here.

Thank you!

I'm trying to enable DHCPV6 so I can specify DNS (as part of a pihole setup). Enabling DHCPV6 in services changes the IPV6 configuration type under interfaces to DHCPv6. But when I click save and apply here, the web UI spins and spins and never returns.