Messages

1

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 17, 2022, 03:14:14 pm »

I have factory reset my opnsense config and configured from scratch again...
seems the issue has gone away and no longer sending the extra dns server.

2

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 16, 2022, 09:48:30 am »

This is a new install / setup. I previous had this setup with a Fortinet Gateway and worked ok. There is no other router setup on my local network. The dhcpv6 packet is sourcing from the mac address from the opnsense firewall.

Cheers,
Sam

3

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 14, 2022, 03:33:00 pm »

Done the packet capture from my windows machine and seeing the opnsense devices as the DNS server. I've attached a screenshot of the packet capture.

4

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 14, 2022, 02:01:37 pm »

MacOS / iPhone and windows, I'm seeing the behavior on. Which is what I'm running at home.

5

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 14, 2022, 04:29:58 am »

My ISP hands out a /48 for customer PD.


those two are there because i set the same dns server twice in both dhcpv6 / RA. I have since removed them and only put one.


But here is the interface configuration.

6

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 13, 2022, 04:14:36 am »

I've checked through the dhcpv6 and radvd configuration and the dns server that clients are seeing isn't there. Configuration seems as expected.

I've attached the configs with my IP addresses anonymized.

Also attached a picture from my phone of the behavior.

Thanks Sam!

7

22.7 Legacy Series / Re: IPV6 RA/DHCP DNS Issue

« on: August 12, 2022, 12:37:40 pm »

Forgot to include, Unbound / DNSMasq is disabled.

8

22.7 Legacy Series / IPV6 RA/DHCP DNS Issue

« on: August 12, 2022, 12:36:55 pm »

Hi,
I was wondering if someone can help with the following...

I have IPv6 configured with with interface tracking enabled to enable delegation of the PD prefix received from my ISP.

I have enabled "Allow manual adjustment of DHCPv6 and Router Advertisements " and entered a DNS server into the RA/DHCPv6 configuration in OPNsense.
RA is enabled and in managed mode.

The issue i have come across is that the DNS server that is set in RA/DHCPv6 is sent to the client correctly and is what I'd expect,  after 10mins or so the dns server that i have set in the dhcpv6 / RA config disappears and the v6 address of the OPNSense appliance appears as a DNS server on the client. Seems to be happening for all devices on my network.

Have i missed configured something that could be causing this?
Can't seem to get my heard around why this would be happening.

Thanks,
Sam!