MRTG-IPV6(1)                         mrtg                         MRTG-IPV6(1)

N?NA?AM?ME?E

       mrtg-ipv6 - IPv6 support in MRTG

O?OV?VE?ER?RV?VI?IE?EW?W

       MRTG and cfgmaker support SNMP over IPv6. IPv6 targets can be specified

       by hostname or IPv6 address, and if the required libraries are present

       (see below), queries will use IPv6.

U?US?SA?AG?GE?E

   E?En?na?ab?bl?li?in?ng?g I?IP?Pv?v6?6

       IPv6 is currently disabled by default and must be explicitly enabled.

       In MRTG this is done by turning on the E?En?na?ab?bl?le?eI?IP?Pv?v6?6 global option in the

       configuration file. In cfgmaker, it is enabled with the -?--?-e?en?na?ab?bl?le?e-?-i?ip?pv?v6?6

       command-line option.

       If IPv6 is disabled, MRTG and cfgmaker should behave in exactly the

       same way as previous versions. So the addition of IPv6 support should

       have no effect on existing MRTG setups unless IPv6 is enabled.

       IPv6 support requires the Socket6 and INET6 libraries (see below). If

       MRTG can't find them, IPv6 is disabled.

   S?Sp?pe?ec?ci?if?fy?yi?in?ng?g I?IP?Pv?v6?6 t?ta?ar?rg?ge?et?ts?s

       IPv6 targets may be specified by name or IPv6 address. Numeric IPv6

       addresses may be used with both cfgmaker and MRTG, but they must be

       enclosed in square brackets.

       For example, a target could be specified as:

        public@[2001:760:4::]:161

       Hostnames work as expected: first an IPv6 name lookup is tried, then an

       IPv4 lookup.

   T?Ta?ar?rg?ge?et?ts?s t?th?ha?at?t d?do?o n?no?ot?t s?su?up?pp?po?or?rt?t S?SN?NM?MP?P o?ov?ve?er?r I?IP?Pv?v6?6

       Many targets (this currently includes all Cisco routers) do not yet

       support SNMP over IPv6 and must be monitored over IPv4. This can cause

       problems if you specify a target through its DNS name and the name maps

       to both the IPv6 address and the IPv4 address of the target: MRTG will

       only try IPv6, and will fail.

       To query these targets, use the I?IP?Pv?v4?4O?On?nl?ly?y per-target option, which tells

       MRTG not to use SNMP over IPv6 for the target.

       MRTG does not fall back to IPv4 for performance and correctness

       reasons. If there are many routers to query, a timeout for every router

       would make MRTG take too long to query them all. And if, for some

       reason, IPv6 connectivity to the target is lost, MRTG's error messages

       can help figure out what is wrong.

       cfgmaker does fall back from IPv6 to IPv4. If IPv6 is enabled and

       cfgmaker is given a hostname that resolves to both an IPv6 and an IPv4

       address, it first tries to query the target over IPv6. If it receives

       no answer, it tries again using IPv4. If the target answers, cfgmaker

       sets the IPv4Only option in the generated config file.

I?IP?Pv?v6?6 L?LI?IB?BR?RA?AR?RI?IE?ES?S

   L?Li?ib?br?ra?ar?ri?ie?es?s r?re?eq?qu?ui?ir?re?ed?d

       IPv6 support requires the S?So?oc?ck?ke?et?t6?6 and I?IN?NE?ET?T6?6 Perl modules. Both can be

       downloaded from CPAN:

       http://search.cpan.org/author/UMEMOTO/Socket6/

       http://search.cpan.org/author/MONDEJAR/INET6/

       If you use Debian, you will need the packages l?li?ib?bs?so?oc?ck?ke?et?t6?6-?-p?pe?er?rl?l and

       l?li?ib?bi?io?o-?-s?so?oc?ck?ke?et?t-?-i?in?ne?et?t6?6-?-p?pe?er?rl?l, which are (or should soon be) in unstable.

       So far, IPv6 support has been tested on Linux only, and only with

       Socket6 version 0.12. Also note that IPv6 won't work at all if you

       don't have INET6.pm version 2.00 or newer.

   I?In?ns?st?ta?al?ll?li?in?ng?g t?th?he?e l?li?ib?br?ra?ar?ri?ie?es?s

       Building and installing Socket6 and INET6 is very simple. For each

       module, just unpack the archive and then do:

        perl Makefile.PL

        make

       and then:

        su

        make install

       If you have installed the libraries successfully, cfgmaker and mrtg

       should automatically detect them and allow IPv6 support to be enabled.

A?AU?UT?TH?HO?OR?R

       Lorenzo Colitti <lorenzo location colitti.com>

2.17.7                            2018-07-13                      MRTG-IPV6(1)