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Resolve hostname to IPv6 address in listen directive

Matthias-Christian Ott
August 25, 2010 03:28AM
At the moment nignx does not allow IPv6 addresses to specified by
hostname in a listen directive, that is the following will not work:

listen ipv6.example.com;
listen [ipv6.example.com];
listen ipv6.example.com ipv6only=on;
listen [ipv6.example.com] ipv6only=on;

Though I see a potential security problem with hostnames here (this
also applies to IPv4), because DNS replies can be manipulated if
DNSSEC is not used, I think that this feature would be helpful and
simplifies administration.

Given that example.com resolves to an IPv4 and IPv6 address, simply
binding to both addresses with the following directive would break
backwards compatibility: listen example.com;

For backwards compatibility I propose the following to resolve the
IPv6 addresses of a hostname and listen on them:

a) listen example.com ipv6only=on;

b) listen [example.com];

Solution b) has the disadvantage that it doesn't conform to RFC 3986.

Due to the fact that IPv4 will be a legacy addressing scheme in the
future, one could also consider to break backwards compatibility and
introduce the option ipv4only.

I would prefer this solution for 0.8 and propose solution a) for 0.7
and 0.8. So in 0.7 IPv4 addresses would be default for hostnames and
hostnames would only be resolved to IPv6 addresses if ipv6only is
present and in 0.8 both addresses would be resolved and the user can
choose between one of the address families with the options ipv4only
and ipv6only.

What do you think?

Regards,
Matthias-Christian

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Subject Author Views Posted

Resolve hostname to IPv6 address in listen directive

Matthias-Christian Ott 2705 August 25, 2010 03:28AM

Re: Resolve hostname to IPv6 address in listen directive

mike 1676 August 25, 2010 03:32AM

Re: Resolve hostname to IPv6 address in listen directive

Maxim Dounin 788 August 25, 2010 07:06AM

Re: Resolve hostname to IPv6 address in listen directive

Matthias-Christian Ott 796 August 25, 2010 01:40PM

Re: Resolve hostname to IPv6 address in listen directive

Maxim Dounin 736 August 25, 2010 02:46PM

Re: Resolve hostname to IPv6 address in listen directive

Matthias-Christian Ott 971 August 25, 2010 07:56PM

Re: Resolve hostname to IPv6 address in listen directive

Piotr Sikora 688 August 25, 2010 02:02PM

Re: Resolve hostname to IPv6 address in listen directive

Maxim Dounin 702 August 25, 2010 03:02PM

Re: Resolve hostname to IPv6 address in listen directive

Piotr Sikora 944 August 27, 2010 03:38AM

[PATCH] Make ipv6only default (was: Re: Resolve hostname to IPv6 address in listen directive)

Matthias-Christian Ott 730 August 27, 2010 06:04PM

Re: [PATCH] Make ipv6only default (was: Re: Resolve hostname to IPv6 address in listen directive)

Matthias-Christian Ott 978 August 28, 2010 06:56PM

Re: Resolve hostname to IPv6 address in listen directive

Matthias-Christian Ott 832 August 25, 2010 08:26PM

Re: Resolve hostname to IPv6 address in listen directive

Piotr Sikora 855 August 27, 2010 03:44AM



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