knot-dns-users April 2017

knot-dns-users@lists.nic.cz

10 participants
11 discussions

forcing minimal fragment size for IPv6 datagrams

by Jan Včelák

Hello guys, there has been a request in our issue tracker [1], to enable IPV6_USE_MIN_MTU socket option [2] for IPv6 UDP sockets in Knot DNS. This option makes the operating system to send the responses with a maximal fragment size of 1280 bytes (minimal MTU size required by IPv6 specification). The reasoning is based on the draft by Mark Andrews from 2012 [3]. I wonder if the reasoning is still valid in 2016. And I'm afraid that enabling this option could enlarge the window for possible DNS cache poisoning attacks. We would appreciate any feedback on your operational experience with DNS on IPv6 related to packet fragmentation. [1] https://gitlab.labs.nic.cz/labs/knot/issues/467 [2] https://tools.ietf.org/html/rfc3542#section-11.1 [3] https://tools.ietf.org/html/draft-andrews-dnsext-udp-fragmentation-01 Thanks and regards, Jan

7 years

problem with Knot 2.4.0 on FreeBSD 10.3 and 11.0 - i386

by Leo Vandewoestijne

Hi, I tried to install knot 2.4.0 on FreeBSD 10.3 & 11.0. On amd64 these complete fine, however on i386 they don't: https://dns.company/downloads/knot2/knot2-2.4.0_103i386.log https://dns.company/downloads/knot2/knot2-2.4.0_110i386.log Is there anything I can do better to prevent this? -- With kind regards, Leo Vandewoestijne

7 years, 5 months

Question on DNSSEC

by Volker Janzen

Hi all, I'm currently looking for alternatives which do automatic DNSSEC signing as a master DNS server. I run a Knot secondary instance and added a manual and auto signing zone, because I want to understand the differences and which is better for my needs. I added this to my knot.conf policy: - id: rsa algorithm: RSASHA256 ksk-size: 2048 zsk-size: 1024 - id: manual manual: on zone: - domain: "auto.test." file: "/etc/knot/master/auto.test.zone" dnssec-signing: on dnssec-policy: default - domain: "manual.test." file: "/etc/knot/master/manual.test.zone" dnssec-signing: on dnssec-policy: manual I'm not sure about how some things work, perhaps someone can answer my questions. When auto signing is used, the ZSKs are rolled automated? And the KSK rollover is not possible at all? Even not manual? For manual mode, I followed these steps to generate the keys: $ keymgr zone key generate manual.test algorithm RSASHA256 size 1024 $ keymgr zone key generate manual.test algorithm ECDSAP256SHA256 size 256 This results in dig @localhost DNSKEY manual.test +short 256 3 8 AwEAAbGES3TH8jPCIhcdc93dbDNoUkDn5YmviG2/lkCESDcIvzpRFjsC ATAZEIEo1LosM6cALS8AVkxKK/BSOpuvLHvhX7O+ny7eX5X/C2PHnGs+ WMieIhbjLJWdIsNCMhSqQ7vTlguFmHbUdyzV+8dnrMl1GSpdSc1P0Fyp vjxDM5+H 256 3 13 H+qtCYv9A0RlqQCOtDyGGEMhVgn92wPdZ+WrqRAqb/MJ3RzdDSyhaX2p B/TU5F8mQccrVIdiJriT+zmWpoW9sA== I don't understand why there is no DNSKEY with SEP set. Shouldn't it be there? Regards, Volker

7 years, 7 months

Knot Resolver 1.2.6 release

by Ondřej Surý

Dear Knot Resolver users, a bugfix release of Knot Resolver 1.2.6 has been released. We have fixed a nasty bug that caused some names to stop resolving if there was a packet lost. We apologize for any inconvenience this might have caused. And thank to all Turris Omnia users and Stéphane Bortzmeyer who provided valuable debugging information. In this release, we have also fixed a handling of AD flag for NODATA answers not covered due opt-out NSEC3 and several other small bugs. The update from 1.2.5 to 1.2.6 is recommended. The update from 1.1.x to 1.2.x branch is strongly recommended, the 1.1.x branch is no longer supported. Full changelog: https://gitlab.labs.nic.cz/knot/resolver/raw/v1.2.6/NEWS Sources: https://secure.nic.cz/files/knot-resolver/knot-resolver-1.2.6.tar.xz GPG signature: https://secure.nic.cz/files/knot-resolver/knot-resolver-1.2.6.tar.xz.asc Documentation: http://knot-resolver.readthedocs.io/en/latest/ Cheers, -- Ondřej Surý -- Technical Fellow -------------------------------------------- CZ.NIC, z.s.p.o. -- Laboratoře CZ.NIC Milesovska 5, 130 00 Praha 3, Czech Republic mailto:ondrej.sury@nic.cz https://nic.cz/ --------------------------------------------

7 years, 7 months

When reverse lookup is done, Block is outputted

by Horigome Yoshihito

Hello, I set it up as below and forward it to kometch.local of the internal domain which is the stub zone, but when reverse lookup it will be output as block. kometch@dns02:~$ drill 192.168.122.1 -x ;; ->>HEADER<<- opcode: QUERY, rcode: NXDOMAIN, id: 43732 ;; flags: qr aa rd ra ; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;; 1.122.168.192.in-addr.arpa. IN PTR ;; ANSWER SECTION: ;; AUTHORITY SECTION: blocked. 900 IN SOA blocked. . 0 3600 900 604800 900 ;; ADDITIONAL SECTION: ;; Query time: 1 msec ;; SERVER: 192.168.122.223 ;; WHEN: Fri Apr 14 22:13:57 2017 ;; MSG SIZE rcvd: 86 # kresd.conf modules = { 'hints > iterate', -- Hints AFTER iterate 'policy > hints', -- Policy AFTER hints 'view < rrcache', -- View BEFORE rrcache predict = { window = 30, -- 15 minutes sampling window period = 24*(60/15) -- track last 6 hours }, 'daf', 'stats' } modules.list() -- Check module call order --stub forward policy.add(policy.pattern(policy.FORWARD('192.168.122.223@10053', '192.168.122.224@10053'), '\7kometch\5local')) In this case, how should it be set? Best regards.

7 years, 7 months

Upgrade broke journal

by Bastien Durel

Hello, For the second time after an upgrade, one of my knot instance did not restart. (actually, it restarts but does not respond to queries) I got theses messages in log : 2017-03-27T17:11:16 warning: [durel.eu.] discontinuity in chages history (2017032310 -> 2017032309), dropping older changesets 2017-03-27T17:11:16 error: [durel.org.] zone event 'load' failed (invalid parameter) 2017-03-27T17:11:16 error: [durel.eu.] failed to store changes into journal (invalid parameter) 2017-03-27T17:11:16 error: [durel.eu.] zone event 'load' failed (invalid parameter) 2017-03-27T17:11:27 warning: [durel.eu.] discontinuity in chages history (2017032310 -> 2017032309), dropping older changesets 2017-03-27T17:11:27 error: [durel.eu.] failed to store changes into journal (invalid parameter) 2017-03-27T17:11:27 error: [durel.eu.] zone event 'load' failed (invalid parameter) 2017-03-27T17:11:27 warning: [durel.org.] discontinuity in chages history (2017032310 -> 2017032309), dropping older changesets 2017-03-27T17:11:27 error: [durel.org.] failed to store changes into journal (invalid parameter) 2017-03-27T17:11:27 error: [durel.org.] zone event 'load' failed (invalid parameter) removing all files in journal/ directory and restarting it leads to normal behaviour. Do you have hints about these error ? Thanks, -- Bastien Durel

7 years, 7 months

Re: [knot-dns-users] Knot DNS 2.4.3 released

by Tobias Geerinckx-Rice

Hullo, Thanks for a new version of Knot DNS! Knot DNS 2.4.3 is now available in the GNU Guix[1] package manager & operating system. Perhaps this might warrant an entry under ‘Distribution packages’ on https://www.knot-dns.cz/download/? I also noticed that the ‘Full Knot DNS 2.4.3 changelog’ link at https://www.knot-dns.cz/2017-04-11-version-243.html still points to the change log for 2.4.2. Kind regards, T G-R (not subscribed to this list) [1]: https://gnu.org/s/guix

7 years, 8 months

Knot DNS 2.4.3 released

by Ondřej Surý

Dear Knot DNS users, CZ.NIC is proud to release the 2.4.3 release of Knot DNS. This release contains many improvements over 2.3.x release of Knot DNS. The Knot DNS 2.4.x is the new stable branch. Starting from the 2.4.0 release we are going to support current stable (2.4.x) and previous stable (2.3.x) branches, and at the same time we are deprecating previous Knot DNS 1.6.x release. The changelog for Knot DNS 2.4.3 is as follows: Improvements: ------------- - Speed-up of rdata addition into a huge rrset - Introduce check of minumum timeout for next refresh - Dnsproxy module can forward all queries without local resolving Bugfixes: -------- - Transfer of a huge rrset goes into an infinite loop - Huge response over TCP contains useless TC bit instead of SERVFAIL - Failed to build utilities with disabled daemon - Memory leaks during keys removal - Rough TSIG packet reservation causes early truncation - Minor out-of-bounds string termination write in rrset dump - Server crash during stop if failed to open timers DB - Failed to compile on OS X older than Sierra - Poor minimum UDP-max-size configuration check - Failed to receive one-record-per-message IXFR-style AXFR - Kdig timeouts when receiving RCODE != NOERROR on subsequent transfer message Thank you for using Knot DNS. Feel free to write us, fill an issue or just say thank you if you are happy with Knot DNS. Full changelog: https://gitlab.labs.nic.cz/labs/knot/raw/v2.4.3/NEWS Sources: https://secure.nic.cz/files/knot-dns/knot-2.4.3.tar.xz GPG signature: https://secure.nic.cz/files/knot-dns/knot-2.4.3.tar.xz.asc Documentation: https://www.knot-dns.cz/docs/2.x/html/ Cheers, -- Ondřej Surý -- Technical Fellow -------------------------------------------- CZ.NIC, z.s.p.o. -- Laboratoře CZ.NIC Milesovska 5, 130 00 Praha 3, Czech Republic mailto:ondrej.sury@nic.cz https://nic.cz/ --------------------------------------------

7 years, 8 months

Knot na CentOS/Debian

by Ondřej Ašenbryl, WEDOS

Dobrý den, již nějakou dobu se trápím s kompilací Knot DNS 2 na CentOS. Nedaří se žádný z verzí 2+ na CentOS 6 ani 7, ani na Debianu. Problém je s knihovnami gnutls a nettle. Ať dělám co dětám, tak mi configure skript končí chybou "configure: error: Package requirements (gnutls >= 3.3 nettle) were not met: ...". GnuTLS se podařilo aktualizovat do verze 3.3, s nettle je všude nějaký problém. Chtěl jsem proto poprosit, zda s tím máte již zkušenost a příp. nějaký osvědčený návod. Knot ve verzi 1.6.X byl naprosto bez problémů, toto se ale bohužel, i po mnoha pokusech, nedaří. Velice děkuji za odpověď, Ondřej Ašenbryl

7 years, 8 months

Knot Resolver 1.2.5 release

by Ondřej Surý

Dear Knot Resolver users, a bugfix release of Knot Resolver 1.2.5 has been released. This is a packed release that contains fixes to the DNSSEC validation as well as other improvements and little bugfixes: Security -------- - layer/validate: clear AD if closest encloser proof has opt-outed NSEC3 (#169) - layer/validate: check if NSEC3 records in wildcard expansion proof has an opt-out - dnssec/nsec: missed wildcard no-data answers validation has been implemented Improvements ------------ - modules/dnstap: a DNSTAP support module (Contributed by Vicky Shrestha) - modules/workarounds: a module adding workarounds for known DNS protocol violators - layer/iterate: fix logging of glue addresses - kr_bitcmp: allow bits=0 and consequently 0.0.0.0/0 matches in view and renumber modules. - modules/padding: Improve default padding of responses (Contributed by Daniel Kahn Gillmor) - New kresc client utility (experimental; don't rely on the API yet) Bugfixes -------- - trust anchors: Improve trust anchors storage format (#167) - trust anchors: support non-root TAs, one domain per file - policy.DENY: set AA flag and clear AD flag - lib/resolve: avoid unnecessary DS queries - lib/nsrep: don't treat servers with NOIP4 + NOIP6 flags as timeouted - layer/iterate: During packet classification (answer vs. referral) don't analyze AUTHORITY section in authoritative answer if ANSWER section contains records that have been requested The update from 1.2.4 to 1.2.5 is recommended. The update from 1.1.x to 1.2.x branch is strongly recommended, the 1.1.x branch is no longer supported. Full changelog: https://gitlab.labs.nic.cz/knot/resolver/raw/v1.2.5/NEWS Sources: https://secure.nic.cz/files/knot-resolver/knot-resolver-1.2.5.tar.xz GPG signature: https://secure.nic.cz/files/knot-resolver/knot-resolver-1.2.5.tar.xz.asc Documentation: http://knot-resolver.readthedocs.io/en/latest/ -- Ondřej Surý -- Technical Fellow -------------------------------------------- CZ.NIC, z.s.p.o. -- Laboratoře CZ.NIC Milesovska 5, 130 00 Praha 3, Czech Republic mailto:ondrej.sury@nic.cz https://nic.cz/ --------------------------------------------

7 years, 8 months

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knot-dns-users April 2017