Messages

1

24.1 Legacy Series / Re: WAN failover and loss of DNS functionality

« on: July 03, 2024, 10:00:24 pm »

I am very new to networking and I don't know the difference between a interface and a gateway. Its been a very interesting journey!

I have DNS Server options unticked and it still does it.

I have found a how to on another part of the forum https://forum.opnsense.org/index.php?topic=9245.msg41626#msg41626 So I will try and work through that.  Ultimately it does not matter which DNS its using as long as it works.  It just doesn't seam to work as I expected.

Thanks all for the help. I will probably be back for more help soon.

2

24.1 Legacy Series / Re: WAN failover and loss of DNS functionality

« on: July 03, 2024, 08:08:40 pm »

I decided to start over and reset to defaults. 

It appears I had used the wrong gateway for my primary WAN.  OPNsense created 2 WAN interfaces, one called WAN which has my external IP address and another called WAN_GW with a slightly different IP address.

The interface called WAN no longer shows in the WAN Gateway as an option so I had to use WAN_GW.  And low and behold everything seams to work now with one exception... 

When I use DNS leak test it still shows my ISP's DNS servers and not the Cloudflare 1.1.1.1 and 1.0.0.1 that I have specified in System : General :  for both WAN Gateway connections.

Can anyone advise why that would be?

3

24.1 Legacy Series / Re: WAN failover and loss of DNS functionality

« on: July 03, 2024, 04:38:31 pm »

Thanks for the reply, I have checked that I have DNS set up for both WAN's. I did not see the bit where you have to edit the LAN firewall rules.  I have now done that but I am getting an error in my browser as follows:

A potential DNS Rebind attack has been detected.
Try to access the router by IP address instead of by hostname. You can disable this check if needed under System: Settings: Administration.

It looks like the DNS is doing something new but I do not know how to proceed.

Can anyone help?

I disabled DNS Rebind check and now all my internet traffic is diverted to 192.168.1.1 which is my OPNsense log in address (not in a good way every website is directed to the OPNsense log in page).

4

24.1 Legacy Series / WAN failover and loss of DNS functionality [Solved]

« on: July 03, 2024, 10:43:25 am »

First of all, I am a complete noob to OPNsense and Networking . I have only been using it for a couple of weeks. My aim is to have two WAN networks for failover. WAN 1 is a HFC DHCP connection. The second is a PPPoE FTTP. Both are within a Gateway Group with WAN 1 being the Primary gateway (tier 1).

My problem is when the Primary connection is disabled WAN 2 takes over and works great, but when WAN 1 recovers it appears to loose DNS functionality.   I can ping google.com no problem but anything that needs DNS does not work.
When this happens, I have to run the System Wizard to fix it with default settings in order to get WAN 1 working again.

I have also found that when I try different settings within interfaces and save that also breaks DNS on WAN 1. Even if I change a setting save and then undo the setting changed, WAN 1 does not work with DNS.
Another thing I have noticed is that despite setting the DNS IP addresses 1.0.0.1 and 1.1.1.1 in System: Settings: General, all DNS queries go to the default ISP DNS servers. Could this be the problem?