#19 man page revision

[Shunsuke Matsumoto]

The traceroute command previously used IPv4 network by default when no options were specified.
However, starting with version 2.1.6, when both IPv4 and IPv6 are available, the default use is no longer fixed to IPv4.
Therefore, we believe the following default description in the man page should be removed.

man traceroute

OPTIONS
-4, -6 Explicitly force IPv4 or IPv6 tracerouting. By default, the program will try to resolve the name given, and choose the appropriate protocol automatically. If resolving a host name returns both IPv4 and IPv6 addresses,
traceroute will use IPv4.

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Execution results

traceroute localhost

traceroute to localhost (::1), 30 hops max, 80 byte packets
1 localhost (::1) 0.098 ms 0.010 ms 0.009 ms

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[Dmitry Butskoy]

Shunsuke Matsumoto wrote:

OPTIONS
-4, -6 Explicitly force IPv4 or IPv6 tracerouting. By default, the
program will try to resolve the name given, and choose the appropriate
protocol automatically. If resolving a host name returns both IPv4 and
IPv6 addresses,
traceroute will use IPv4.

Yes, surely it must be changed. Thanks for the report.