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fping 4.1 (UNRELEASED)
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======================
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## Bugfixes and other changes
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- Fix problem when socket fd is 0 (#125, thanks Ramón Novoa!)
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- Fix running on servers with disabled IPv6 (#118, thanks Simon Matter)
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- Allow running "fping -h" or "--help" even when raw socket can't be opened (#131, thanks @teto)
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fping 4.0 (2017-04-23)
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======================
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## Incompatible Changes
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##### fping and fping6 unification
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fping and fping6 are now unified into one binary. It means that, for example,
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doing 'fping google.com' is going to ping the IPv6 IP of google.com on
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IPv6-enabled hosts.
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If you need exact compatibility with old versions, you can configure and
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install fping twice: once for ipv4, and once for ipv6:
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./configure --disable-ipv6; make clean install
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./configure --disable-ipv4 --program-suffix=6; make clean install
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##### Option -n, not the same as -d anymore
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Option -n / --name is now doing a reverse-DNS lookups on host addresses,
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only if they are given as IP address, but not for hostnames. For example,
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if you write 'fping -n google.com', fping would previously do a
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forward-DNS lookup on google.com, and then a reverse-DNS lookup on the
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resolved IP address. Now, it is just going to keep the name 'google.com'.
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That same behavior can be achieved with the option -d / --rdns (which was
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previously an alias for -n).
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fping<4.0 fping>=4.0
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fping -n NAME NAME->IP->IPNAME NAME
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fping -d NAME NAME->IP->IPNAME NAME->IP->IPNAME
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##### Discarding of late packets
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fping will now discard replies, if they arrive after the defined timeout
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for reply packets, specified with -t. This change is relevant only for the
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count and loop modes, where the measured times should be now more
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consistent (see github issue [#32][i32] for details).
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To prevent loosing reply packets because of this change, the default
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timeout in count and loop modes is now automatically adjusted to the
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period interval (up to 2000 ms), but it can be overriden with the -t
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option. The default timeout for non-loop/count modes remains 500 ms.
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##### No restrictions by default
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fping will not enforce -i >= 1 and -p >= 10 anymore, except if you
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'./configure --enable-safe-limits'.
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The reasoning to removing the restrictions by default, is that users can
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clog the network with other tools anyway, and these restrictions are
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sometimes getting in the way (for example if you try to ping a lot of
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hosts).
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##### Default interval (-i) changed from 25ms to 10ms
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The default minimum interval between ping probes has been changed from
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25ms to 10ms. The reason is that 25ms is very high, considering today's
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fast networks: it generates at most 31 kbps of traffic (for IPv4 and
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default payload size).
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## New features
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- Unified 'fping' and 'fping6' into one binary ([#80][i80])
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- Long option names for all options
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- IPv6 enabled by default
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- New option -4 to force IPv4
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- New option -6 to force IPv6
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- Keep original name if a hostname is given with -n/--name
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- Option -d/--rdns now always does a rdns-lookup, even for names, as '-n' was doing until now
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- Enforce -t timeout on reply packets, by discarding late packets ([#32][i32])
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- Auto-adjust timeout for -c/-C/-l mode to value of -p
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## Bugfixes and other changes
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- -i/-p restrictions disabled by default (enable with --enable-safe-limits)
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- Default interval -i changed from 25ms to 10ms
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- Fix compatibility issue with GNU Hurd
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- A C99 compiler is now required
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- Option parsing with optparse (https://github.com/skeeto/optparse). Thanks Christopher Wellons!
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- New changelog file format
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[i32]: https://github.com/schweikert/fping/issues/32
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[i80]: https://github.com/schweikert/fping/issues/80
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(see doc/CHANGELOG.pre-v4 for older changes)
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