Date: Wed, 19 Feb 2025 14:25:50 +0100 From: Harald Eilertsen <haraldei@anduin.net> To: Bob Bishop <rb@gid.co.uk> Cc: FreeBSD Java mailing list <freebsd-java@freebsd.org> Subject: Re: IPv6 in Java on FreeBSD Message-ID: <ywr3pu3reutrld46yo5mirupwbgkt432wkbvdrt5ypeyronex4@eyqqqlwmgazf> In-Reply-To: <AC490949-4A9C-406A-96C4-A5FF4BFA4083@gid.co.uk> References: <rndfmkxkd6gegwcutixzdiayaqkcuoz4ssqn4zqm2jogidx3oe@xwqgvxjara2a> <AC490949-4A9C-406A-96C4-A5FF4BFA4083@gid.co.uk>
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Hi Bob, On Wed, Feb 19, 2025 at 12:26:17PM +0000, Bob Bishop wrote: > I would just point out that back in history Java used to want mapped > IPv4 (net.inet6.ip6.v6only=0) if IPv6 was enabled; most people don’t > want that which may be why IPv6 support hasn’t been enabled. That's really useful feedback! And the observation is still correct. Java will by default clear the IPV6_V6ONLY flag on sockets when IPv6 is available and requested (the default.) I've made a quick test, where I patch Java to leave the setting alone, but otherwise leave IPv6 enabled. That will allow the sysctl setting to decide whether to use dual-socket or only accept IPv6 connections on the socket. Personally I think that makes sense. I'll update the PR's accordingly. Take care! Haraldhelp
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