So DNS Black-holing is not new obviously, and what stands out as the go to solution? Pihole probably… and yeah thats what im using because hey its a popular choice. Though I am running it in docker. Combining that with Unbound (also in docker), and configuring outbound DNS to use DNS over TLS, with a few additional minor tweaks, but otherwise mostly standard configuration on both.
Wondering what you guys might be using, and if you are using Pihole and/or Unbound if you have any tips on configuration.
Happy to share my config if there is interest.
Out of curiosity, why did you decide on DoT instead of DoH (DNS over HTTPS)?
Unbound on the router which connects upstream with DNS over TLS. Ports 53 and 853 are NATed to the phiole and several other DNS servers like Google’s are blocked so devices can’t bypass the pihole very easily. This is only on my primary VLAN. Other VLANs are given the Unbound DNS by default but are allowed to bypass if they insist. I have one VLAN for guests and one for trusted devices in addition to the primary one.
In my particular setup, I have an additional constraint and that is that my network has to be designed for portability and travel. Not that it affects your design per say. Thank you for the response. Just something that occurred to me that I hadnt mentioned.
I am living a transient life at the moment. So lots of virtualization and lack of control concerning the WAP and such.
I do like your set up btw.
I have an n100 box that I put opnsense on for routing, firewall, DHCP, DNS and IDS. It uses unbound for DNS and so I’m leveraging the blocklist functionality in unbound. And then I use unbound to resolve instead of using DoT forwarding.
Dnsbl is only a small component of effective network security. Arguably the firewall is most important and so I have a default deny all for any device on my LAN trying to reach the Internet.
All applications need specific allows. Thus internally no device can use dns over tls because 853 is blocked by default. Then I use a DNSBL to catch known DoH by domain since the cert is provided by domain name.
“Dnsbl is only a small component of effective network security. Arguably the firewall is most important and so I have a default deny all for any device on my LAN trying to reach the Internet.” 100%, I decided to break up my posts into sub components of the total stack, but to your point currently im enforcing a deny all inbound and outbound at the host level, as the network is shared with the fam and they are not ready for that level of learning (pain, lol)
I just learned about unbound, didnt realize it had a blocklist capability so thats great to know. Gotta dig into it.
I like that last bit, blocking DoT except for the one approved path. Much like TLS 1.3 it offers insider threat protection against inspection. So with that in mind when you said you are using unbound instead of using DoT forwarding, you mean instead of allowing clients to DoT forward, right? Thats what I am doing now as well, though I am not actively blocking it yet. Just currently enabling and testing feasibility on a single host to see the performance and operational impacts of privacy/security implementations.
Curious to your IDS solution, I gotta dig into opnsense. I know about it, its been around a long time, but havent touched it in so long I cant remember its capabilities.
I use cloudflared to translate DNS into DNS over TLS instead of Unbound to make it into recursive DNS. Just never really seen the need to switch it. I’m happy with nextDNS + Cloudflare resolving DNS upstream.
The main thing I wanted to note is port 53 outbound is blocked at the router to prevent devices from using external/unencrypted DNS. If a LAN device wants DNS resolution they MUST use the LAN DNS servers they were given via DHCP, or use their own DoT config, as plain DNS won’t make it out of the network.
It’s because of this block/enforcement that I run two local DNS servers: pihole on an RPI and a mirror on my main server tower, with Galaxy-Sync keeping them identical. If I tinker with/update one, the other picks up the slack so connectivity/resolution isn’t disrupted.
Yeah, I am pretty close to that, the pihole to unbound, unbound DoT to cloudflare. What I am doing at this point is bypassing the DNS to ISP, but as I stated in my response above, not yet blocking everything on the net from using the regular stuff. Just feasibility testing at the moment.
Love the dual setup for DNS. I set my primary to this and my secondary to just cloudflare at them moment for when I bork my primary DNS will fidgeting with it, haha.
