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From: "Michael Kerrisk (man-pages)" <>
To: Thomas Bartelsmeier <>
Subject: Re: [PATCH] hosts.5: Clarify capability for IPv6 outside of examples
Date: Tue, 30 Jun 2020 09:34:26 +0200
Message-ID: <> (raw)
In-Reply-To: <>

Hello Thomas,

On 6/29/20 5:07 PM, Thomas Bartelsmeier wrote:
> Resolves
> Signed-off-by: Thomas Bartelsmeier <>

Thanks. Patch applied.



> ---
> The first addition should be relatively uncontroversial.
> As the prevalence of IPv6 continues to increase, it is about
> time to not only mention the IPv6 compatibility of the hosts
> file in the examples at the very bottom of the man page.
> The second addition is in relation to the Bugzilla report.
> It is a simple statement which is true even for the default
> version of the hosts file and its two entries for localhost.
> However, I do not consider it necessary for any casual user to
> add both IPv4 and IPv6 addresses for any hosts.
> Therefore, I cautiously did not change the wording criticized in
> the bug report in case of any possible negative interactions.
> As a result, the second addition is meant to be for completeness
> and for use by people who know they actually need this.
>  man5/hosts.5 | 3 +++
>  1 file changed, 3 insertions(+)
> diff --git a/man5/hosts.5 b/man5/hosts.5
> index cb055f5f6..1230f9303 100644
> --- a/man5/hosts.5
> +++ b/man5/hosts.5
> @@ -42,6 +42,7 @@ line should be present with the following information:
>  IP_address canonical_hostname [aliases...]
>  .RE
>  .PP
> +The IP address can conform to either IPv4 or IPv6.
>  Fields of the entry are separated by any number of blanks and/or
>  tab characters.
>  Text from a "#" character until the end of the line is
> @@ -53,6 +54,8 @@ alphabetic character and end with an alphanumeric character.
>  Optional aliases provide for name changes, alternate spellings,
>  shorter hostnames, or generic hostnames (for example,
>  .IR localhost ).
> +If required, a host may have two separate entries in this file;
> +one for each version of the Internet Protocol (IPv4 and IPv6).
>  .PP
>  The Berkeley Internet Name Domain (BIND) Server implements the
>  Internet name server for UNIX systems.

Michael Kerrisk
Linux man-pages maintainer;
Linux/UNIX System Programming Training:

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 15:07 Thomas Bartelsmeier
2020-06-30  7:34 ` Michael Kerrisk (man-pages) [this message]

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