knot-resolver-users February 2026

knot-resolver-users@lists.nic.cz

4 participants
4 discussions

Re: is there a way to force DNS64 synthesis for specific domains that have native AAAA records?

by Vladimír Čunát

On 12/01/2026 00.11, * wrote: > However, I cannot use it in my production environment as this returns > NODATA globally (all views) for security.ubuntu.com. > I have several views not using dns64 for which the AAAA record should > be the existing original answer. While on Lua level it's not ergonomic, tags are supported in these APIs, so you can do a tiny change, e.g.: lua: policy-script: | assert(C.kr_rule_local_data_ins( kres.rrset(kres.str2dname('security.ubuntu.com.'), kres.type.AAAA, nil, C.KR_RULE_TTL_DEFAULT), nil, policy.get_tagset({'myTag'}), C.KR_RULE_OPTS_DEFAULT ) == 0) and then you just need to add myTag to the views where you want to apply this rule (in YAML). You can read more about tags and views in the docs, around page https://www.knot-resolver.cz/documentation/latest/config-policy-new.html

5 months, 1 week

Ingesting RPZs

by Giles Crawford

Hi All, Just wondering how you guys are ingesting RPZ feeds into Knot Resolver. While Knot doesn't natively support zone transfers at this time, it can import the zone files, and then kick the zone if the file changes, so that's what I'm doing. I'm doing the zone transfers (10 zones from ioc2rpz) using BIND for now, and then writing the zone files to storage that Knot Resolver can read. I know that dns4eu uses Knot Resolver for their protective recursor service, so I'd be curious to know how they're doing this. Could be that they're using a custom version of Knot that's zone transfer capable. For context, I run Knot Resolver behind dnsdist, and they're complimentary, offering huge flexibility. Would be great to see rpz-passthru support in the BIND format too (forgive me if that's already possible) so that a traditional white-list-first tiered approach can be followed. (Super impressed with Knot resolver, so hats off to all at CZ). Cheers, GC

8 months, 1 week

SERVFAIL with Internal Resolver

by Darren Rambaud

Hi knot-resolver-users -- I am looking to install a DNS resolver for my local network and `knot-resolver` seemed to fit the bill. Network is setup like this: VLAN 1 Gateway IP 10.0.0.5 Search Domain Name internal.example.com <http://internal.example.com/> VLAN 2 Gateway IP 10.0.1.1 Search Domain Name research.internal.example.com <http://research.example.com/> ... At the moment, `knot-resolver` deployed to a single server (10.0.1.6) with this configuration: ``` forward: - options: authoritative: true dnssec: false servers: - 10.0.0.5 subtree: - internal.example.com - options: authoritative: true dnssec: false servers: - 10.0.1.1 subtree: - research.internal.example.com logging: level: info network: listen: - freebind: false interface: - 127.0.0.1 - 10.0.1.6 kind: dns port: 53 workers: 1 ``` On another machine (10.0.0.100), public queries resolve correctly: ``` # dig @10.0.1.6 knot-resolver.cz ; <<>> DiG 9.20.17 <<>> @10.0.2.6 knot-resolver.cz ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34301 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;knot-resolver.cz. IN A ;; ANSWER SECTION: knot-resolver.cz. 1800 IN A 217.31.204.96 ;; Query time: 1281 msec ;; SERVER: 10.0.1.6#53(10.0.1.6) (UDP) ;; WHEN: Fri Jan 30 16:19:23 CST 2026 ;; MSG SIZE rcvd: 61 # nslookup knot-resolver.cz 10.0.1.6 Server: 10.0.1.6 Address: 10.0.1.6#53 Non-authoritative answer: Name: knot-resolver.cz Address: 217.31.204.96 Name: knot-resolver.cz Address: 2001:1488:800:400::2:96 ``` Queries within internal network return the correct assigned IP address however report `SERVFAIL`: ``` # nslookup m1.research.internal.example.com 10.0.2.6 Server: 10.0.1.6 Address: 10.0.1.6#53 Non-authoritative answer: Name: m1.research.internal.example.com Address: 10.0.2.6 ;; Got SERVFAIL reply from 10.0.1.6 ** server can't find m1.research.internal.example.com: SERVFAIL ``` Replacing `10.0.2.6` with `10.0.0.5` (gateway IP that normally acts as resolver) does not return `SERVFAIL`: ``` # nslookup obnoxious.research.in.rambaud.dev 10.0.0.5 Server: 10.0.0.5 Address: 10.0.0.5#53 Name: m1.research.internal.example.com Address: 10.0.2.6 ``` Is the SERVFAIL something I should worry about here? Or is there a misconfiguration on my end with `knot-resolver`? Darren

8 months, 1 week

Knot Resolver 6.2.0

by Aleš Mrázek

Dear Knot Resolver users, Knot Resolver 6.2.0 has been released! Improvements: - DNS-over-QUIC (DoQ) is available for serving (beta, !1747) Bugfixes: - fix UDP answers without sendmmsg, e.g. on non-Linux (!1795) - fix /logging/groups in python 3.8 (!1799) Full changelog: https://gitlab.nic.cz/knot/knot-resolver/raw/v6.2.0/NEWS Sources: https://secure.nic.cz/files/knot-resolver/knot-resolver-6.2.0.tar.xz GPG signature: https://secure.nic.cz/files/knot-resolver/knot-resolver-6.2.0.tar.xz.asc Documentation: https://www.knot-resolver.cz/documentation/v6.2.0/ -- Ales Mrazek PGP: 3057 EE9A 448F 362D 7420 5A77 9AB1 20DA 0A76 F6DE

8 months, 1 week

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knot-resolver-users February 2026