.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "ALL-KNOWING-DNS 1p" .TH ALL-KNOWING-DNS 1p "2023-09-25" "perl v5.36.0" "User Contributed Perl Documentation" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" all\-knowing\-dns \- Tiny DNS server for IPv6 Reverse DNS .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& all\-knowing\-dns [\-\-configfile ] [\-\-querylog] .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" AllKnowingDNS provides reverse \s-1DNS\s0 for IPv6 networks which use \s-1SLAAC\s0 (autoconf), e.g. for a /64 network. .PP The problem with IPv6 reverse \s-1DNS\s0 and traditional nameservers is that the nameserver requires you to provide a zone file. Assuming you want to provide \&\s-1RDNS\s0 for a /64 network, you have 2**64 = 18446744073709551616 different usable \&\s-1IP\s0 addresses (a little less if you are using \s-1SLAAC\s0). Providing a zone file for that, even in a very terse notation, would consume a huge amount of disk space and could not possibly be held in the memory of the computers we have nowadays. .PP AllKnowingDNS instead generates \s-1PTR\s0 and \s-1AAAA\s0 records on the fly. You only configure which network you want to serve and what your entries should look like. .SH "OPTIONS" .IX Header "OPTIONS" .IP "\fB\-\-configfile=\f(BIpath\fB\fR" 4 .IX Item "--configfile=path" Use \fIpath\fR instead of /etc/all\-knowing\-dns.conf as configuration file. .IP "\fB\-\-querylog\fR" 4 .IX Item "--querylog" Enable logging every query to stdout (for debugging). .SH "CONFIGURATION FILE (/etc/all\-knowing\-dns.conf)" .IX Header "CONFIGURATION FILE (/etc/all-knowing-dns.conf)" The configuration file is wonderfully simple: .PP .Vb 1 \& # Configuration file for AllKnowingDNS v1.7 \& \& listen 79.140.39.197 \& listen 2001:4d88:100e:1::3 \& \& # RaumZeitLabor \& network 2001:4d88:100e:ccc0::/64 \& resolves to ipv6\-%DIGITS%.nutzer.raumzeitlabor.de \& with upstream 2001:4d88:100e:1::2 \& \& # Chaostreff \& network 2001:4d88:100e:cd1::/64 \& resolves to ipv6\-%DIGITS%.treff.noname\-ev.de .Ve .PP This example contains all configuration directives. Let's go over them one by one: .IP "\fBlisten \f(BIaddress\fB\fR" 4 .IX Item "listen address" Listens on the given \fIaddress\fR (IPv4 and IPv6 is supported) on port 53. .IP "\fBnetwork \f(BInetwork\fB\fR" 4 .IX Item "network network" Specifies that queries for \s-1PTR\s0 records within the given network should be answered (any query for an unconfigured network will be answered with \&\s-1NXDOMAIN\s0). You need to specify at least the \fBresolves to\fR directive afterwards. .IP "\fBresolves to \f(BIaddress\fB\fR" 4 .IX Item "resolves to address" Specifies the address to which \s-1PTR\s0 records should resolve. The address needs to contain \f(CW%DIGITS\fR% exactly once. When answering \s-1AAAA\s0 queries, \f(CW%DIGITS\fR% will be parsed and converted back to an IPv6 address. .Sp Example: .Sp .Vb 2 \& network 2001:4d88:100e:ccc0::/64 \& resolves to ipv6\-%DIGITS%.nutzer.raumzeitlabor.de .Ve .Sp Example query: .Sp .Vb 2 \& The PTR query 2001:4d88:100e:ccc0:216:eaff:fecb:826 will resolve to \& ipv6\-0216eafffecb0826.nutzer.raumzeitlabor.de .Ve .IP "\fBwith upstream \f(BIaddress\fB\fR" 4 .IX Item "with upstream address" Before answering a \s-1PTR\s0 query for this network, AllKnowingDNS will ask the \s-1DNS\s0 server at \fIaddress\fR first, appending .upstream to the query. .Sp Example: .Sp .Vb 3 \& network 2001:4d88:100e:ccc0::/64 \& resolves to ipv6\-%DIGITS%.nutzer.raumzeitlabor.de \& with upstream 2001:4d88:100e:1::2 .Ve .Sp Example query: .Sp .Vb 5 \& The PTR query 2001:4d88:100e:ccc0:219:dbff:fe43:2ec5 will make \& AllKnowingDNS ask for \& 5.c.e.2.3.4.e.f.f.f.b.d.9.1.2.0.0.c.c.c.e.0.0.1. \e \& 8.8.d.4.1.0.0.2.ip6.arpa.upstream. at 2001:4d88:100e:1::2 \& and relay the answer, if any. .Ve .SH "DELEGATING ZONES" .IX Header "DELEGATING ZONES" This section shows you how to delegate a zone in \s-1BIND9\s0 or any \s-1DNS\s0 server with a compatible zone file syntax. To use AllKnowingDNS, you need to delegate the appropriate .ip6.arpa zone for your network and one regular domain. .SS "\s-1REVERSE DELEGATION\s0 (.ip6.arpa)" .IX Subsection "REVERSE DELEGATION (.ip6.arpa)" .Vb 12 \& $ORIGIN . \& $TTL 604800 ; 1 week \& e.0.0.1.8.8.d.4.1.0.0.2.ip6.arpa IN SOA infra.in.zekjur.net. \e \& hostmaster.zekjur.net. ( \& 20 ; serial \& 604800 ; refresh (1 week) \& 86400 ; retry (1 day) \& 2419200 ; expire (4 weeks) \& 604800 ; minimum (1 week) \& ) \& NS libri.sur5r.net. \& NS infra.in.zekjur.net. \& \& ; net for RaumZeitLabor \& 0.c.c.c.e.0.0.1.8.8.d.4.1.0.0.2.ip6.arpa. IN NS ipv6\-rdns.zekjur.net. .Ve .SS "\s-1FORWARD DELEGATION\s0 (.nutzer.raumzeitlabor.de)" .IX Subsection "FORWARD DELEGATION (.nutzer.raumzeitlabor.de)" .Vb 10 \& $TTL 6h \& raumzeitlabor.de IN SOA ns1.jpru.de. hostmaster.jpru.de. ( \& 2012030701 \& 3h \& 30m \& 7d \& 1d ) \& IN NS ns1.jpru.de. \& IN NS ns2.jpru.de. \& IN A 195.49.138.121 \& IN MX 10 rzl.uugrn.org. \& IN MX 20 up.uugrn.org. \& IN MX 50 mail.uugrn.org. \& IN MX 100 rzl.uugrn.org. \& \& nutzer.raumzeitlabor.de. IN NS ipv6\-rdns.zekjur.net. .Ve .SH "VERSION" .IX Header "VERSION" Version 1.7 .SH "AUTHOR" .IX Header "AUTHOR" Michael Stapelberg, \f(CW\*(C`\*(C'\fR .SH "LICENSE AND COPYRIGHT" .IX Header "LICENSE AND COPYRIGHT" Copyright 2012 Michael Stapelberg. .PP This program is free software; you can redistribute it and/or modify it under the terms of the \s-1BSD\s0 license.