From nobody Wed Feb 19 13:25:50 2025 X-Original-To: freebsd-java@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Yycbl0QNFz5pN0l for ; Wed, 19 Feb 2025 13:26:11 +0000 (UTC) (envelope-from haraldei@anduin.net) Received: from mail.anduin.net (mail.anduin.net [185.42.170.45]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Yycbk5kxJz3MM7 for ; Wed, 19 Feb 2025 13:26:10 +0000 (UTC) (envelope-from haraldei@anduin.net) Authentication-Results: mx1.freebsd.org; none DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=anduin.net; s=dkim2021; h=In-Reply-To:Content-Transfer-Encoding:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=4ql9oPP7RLL/d6VSyoX4xQjApzaTDTHuFOegU1zftqo=; t=1739971570; x=1740835570; b=jVrbv9gpZrfOAQLjqKg3qmfA3qhSpcX0T2WuWUt0lTfFqZAAN96qwVPJU3fQZ0KqaqCPSqDkCBR 1LBsK7nwFFEkmWTRWgjm6vQAC7zCmWUdi6UAl4sX9qq93ptU8eGSCsYNfdP3ST8U0OAp8YsTA0P9c RTXP8WsN+74JNXZVnFPfPAHzh0gqxLbA5V1gF53Qmgky7eIffe8nJ2V3QSj7/F74SHBCFBlmvsdiS 4pegCp3jwci5gZemxoHt4Oun4yWfiIKbsQn/LuB2nxamwxErtAu84alIOUMQJuNrSQgyukLFWvnE8 ETrCwbhrKwJz3gGa3eulJKOH3PvrXcPwt99A==; Received: by mail.anduin.net with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.97.1 (FreeBSD)) (envelope-from ) id 1tkk5W-000000005oW-199F; Wed, 19 Feb 2025 13:26:07 +0000 Date: Wed, 19 Feb 2025 14:25:50 +0100 From: Harald Eilertsen To: Bob Bishop Cc: FreeBSD Java mailing list Subject: Re: IPv6 in Java on FreeBSD Message-ID: Mail-Followup-To: Bob Bishop , FreeBSD Java mailing list References: List-Id: Porting Java to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-java List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-java@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-SA-Authenticated: Yes X-Spam-Score: -1.9 X-Spam-Level: - X-Spam-Report: host: mail.modirum.com | contact: hostmaster@modirum.com | scores: BAYES_00=-1.9,NO_RELAYS=-0.001 | autolearn=no autolearn_force=no, score=0 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:62248, ipnet:185.42.170.0/24, country:EE] X-Rspamd-Queue-Id: 4Yycbk5kxJz3MM7 X-Spamd-Bar: ---- 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! Harald