knot-dns-users September 2016

knot-dns-users@lists.nic.cz

5 participants
3 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

6 years, 9 months

Knot 2 on CentOS 6

by Anand Buddhdev

I would like to thank Jan Včelák for submitting the gnutls30 package into EPEL 6. This allows one to build Knot 2 for RHEL/CentOS 6 without having to hunt down any dependencies. We still run CentOS 6 and it's useful to be able to upgrade to Knot 2 on our servers. Thanks Jan! Regards, Anand

7 years, 11 months

configuring dnstap in knot 2.2.1

by Lowell Mower

Hello: I've compiled knot 2.2.1 and configured with the --enable-dnstap flag but continue to get errors when starting knot and configuring it to use dnstap to write to a file see below: * * * * * * * * * * * * * * * * * * * * * * * * ./configure: knot 2.2.1 Target: linux-gnu x86_64 Compiler: gcc -std=gnu99 CFLAGS: -g -O2 -Wall -Werror=format-security -Werror=implicit -fpredictive-commoning LIBS: -lcap-ng -ldl -lpthread -lm LibURCU: -lurcu GnuTLS: -lgnutls -lnettle -I/usr/include/p11-kit-1 Jansson: -ljansson Libedit: -ledit -I/usr/include/editline LMDB: embedded Sanitizer: LibFuzzer: no Prefix: /usr/local Run dir: ${prefix}/var/run/knot Storage dir: ${prefix}/var/lib/knot Config dir: ${prefix}/etc/knot Configuration DB mapsize: 500 MiB Timers DB mapsize: 100 MiB Knot DNS libraries: yes Knot DNS daemon: yes Knot DNS utils: yes Knot DNS documentation: yes Use SO_REUSEPORT: yes Fast zone parser: no Utilities with IDN: no Systemd integration: no Dnstap support: yes Code coverage: no Bash completions: no PKCS 11 support: no Continue with 'make' command * * * * * * * * * * * * * * * * * * * * * * * * /etc/knot.conf server: listen: 100.88.99.132 nsid: knot-2.2.1-dnsproxy-0.1.0 log: - target: syslog any: info remote: - id: authcore address: 127.0.0.1@53535 mod-dnsproxy: - id: sdt remote: authcore template: - id: default global-module: mod-dnsproxy/sdt mod-dnstap: - id: capture_all sink: /tmp/dnstap.tap template: - id: default global-module: mod-dnstap/capture_all * * * * * * * * * * * * * * * * * * * * * * * * knotc -c /etc/knot.conf reload error: config, file '/etc/knot.conf', line 21, item 'mod-dnstap', value '' (invalid item) error: failed to load configuration file '/etc/knot.conf' (invalid item) * * * * * * * * * * * * * * * * * * * * * * * * I've tried various configurations and have been using: https://www.knot-dns.cz/docs/2.x/html/configuration.html#dnstap-dnstap-enab… as a guide. What am I missing?

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knot-dns-users September 2016