From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: "Dr. Arne Babenhauserheide" Newsgroups: gmane.lisp.guile.devel Subject: Re: (web server) serving on both ipv6 and ipv4? Date: Wed, 19 Jan 2022 22:42:16 +0100 Message-ID: <87fspjiejk.fsf@web.de> References: <87k0ewi0w2.fsf@web.de> <20220119130733.fe13d5f14bd2a818266ddc10@gmail.com> <20220119134413.20b5d9944b9bbf51b198b948@gmail.com> <20220119211237.c451bfb4a6f9369d926f2cde@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28550"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.6.10; emacs 27.2 Cc: guile-devel@gnu.org To: Chris Vine Original-X-From: guile-devel-bounces+guile-devel=m.gmane-mx.org@gnu.org Wed Jan 19 23:13:52 2022 Return-path: Envelope-to: guile-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nAJDE-0007Ex-AI for guile-devel@m.gmane-mx.org; Wed, 19 Jan 2022 23:13:52 +0100 Original-Received: from localhost ([::1]:50520 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nAJDD-00014d-5X for guile-devel@m.gmane-mx.org; Wed, 19 Jan 2022 17:13:51 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:59514) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAInW-0001qy-IP for guile-devel@gnu.org; Wed, 19 Jan 2022 16:47:19 -0500 Original-Received: from mout.web.de ([212.227.15.14]:55927) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAInT-00086Y-GP for guile-devel@gnu.org; Wed, 19 Jan 2022 16:47:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1642628833; bh=lk8yzXbZIJJ2PkwTfVw+xqSrzI4EVoPpWK2yha45yII=; h=X-UI-Sender-Class:References:From:To:Cc:Subject:Date:In-reply-to; b=EECk0MrKKA4KrGAjwW22TruhqDjlHXx1ROPAKW+RvHuiuzgtV9rMX9AZiOJyaIoOA XlFOmb/Ea+9wNB1UXsxI+WRbkmEzNNf3ni+8+8GcesoRBUzZd56av31afj3h6+iYWc 4uH5Z/NyvD+mrGDeE3F0mzvK67aOjAUym3CtVrJE= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Original-Received: from fluss ([84.149.81.193]) by smtp.web.de (mrweb006 [213.165.67.108]) with ESMTPSA (Nemesis) id 1N0Icd-1mPlxP3NEl-00wuWC; Wed, 19 Jan 2022 22:47:12 +0100 In-reply-to: <20220119211237.c451bfb4a6f9369d926f2cde@gmail.com> X-Provags-ID: V03:K1:hiTD37OQ1ABlb0K+utTmSnxjSfF+Ke5kytJk2GHA1pc2QLNCvPB q58zRuBoOtymlLww6PAIoFyKSEtFXbpQpSVJizTynaAJlnC6ofxZIkiv2StM3iZlEflOAiy +CbrK932+fXNC6fNfh7DNRwIcPP2NlIavx7iNXFmvhkK73dgoY1YDTA2DY47FfPWhpLCrp1 n1F46ifgUHNMBImcKf1dw== X-UI-Out-Filterresults: notjunk:1;V03:K0:URGQHrXFZJg=:aJTF/6Yk0ON5NzVYuo9ghv 9gpWr7a5gPDEXZ8C93voM5K5k+eI65PJsS9hfVHWS9UWH1SLHDdiyiO20FFKXG9g7G+70nXkD UWJ3LSVMf36ZSP25TBVhJTE71ccd/5Zjx1exaZGx7nvxaFqkakoOENkjyma2EqDYDi3y1bMeB e6RMX0Q5p5iNjmzlH3afqrvY0HFgvJtWvWgOwZlEoSJS+BczfLAbMn3xwf1KG887edHzJaza5 aSIBdCqTm2GVRdjAtgGgmBuiQnWEKL73h3D1ysc99odPdoeBMJ2CdHYwcbjM43Hbii+s2ryud EN/N54QXLfUUy372feD2AsClFdrGWj9k6WwBEU9AJgQt9RebETwBodZruA717wwyKea4EWrlH v37gEQ8jbTFW3QS8WhdApch/vwq4qI9bMvLB731xF0jivQ9CODdiW2ZZPFuK2WUv2Qiv9L5NY sJLZf6ty8CQYuNAyu6l2aQYPmIPidZI/PgNg1jtGvGatMIJ73rWfvDiiildXiE2HwzeV1MzRr VghYthMmHclkXiPXg0VjM3FwOrpqsY+i1PI2siurOwKc3HlV+kJy8L0QiHWYEGB9Owil7vSkN 2OLtBp3PcbDFpnpCcxHy/Ffssi8GAX9qPYDSD6KG8snmme/kJ9LkTeYtL9wd7+jDgZF61h3J3 kxxYF2AhIYmGJkiXjl4jbkzF+I6wwWKfJP6zjXopgLksev13AdIlhtgaJDjrfBI6jrOHwQ0JV t1hDVePGb49A4aZ/aKeC8MjB9bya4qxIWvVsl7LB9pAgyLUdmRCZoplT9nUi6T7dti20JPGY Received-SPF: pass client-ip=212.227.15.14; envelope-from=arne_bab@web.de; helo=mout.web.de X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guile-devel-bounces+guile-devel=m.gmane-mx.org@gnu.org Original-Sender: "guile-devel" Xref: news.gmane.io gmane.lisp.guile.devel:21044 Archived-At: --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Chris Vine writes: > On Wed, 19 Jan 2022 13:44:13 +0000 > Chris Vine wrote: >> On Wed, 19 Jan 2022 13:07:33 +0000 >> Chris Vine wrote: >> [snip] >> > As I understand it, with linux IPv6 sockets are dual stack capable, and >> > in earlier kernel versions this was be enabled by default. I believe >> > with current versions that is no longer the case, and that you have to >> > specifically enable dual stack by turning off IPV6_V6ONLY using >> > setsockopt before binding on the socket. >> >=20 >> > Then, if receiving a IPv4 connection from address 1.2.3.4, this would = be >> > mapped as ::::ffff:1.2.3.4. >> >=20 >> > I do not know about other OSes. I have half a memory that some earlier >> > versions of windows did not support dual stack sockets (XP?). >>=20 >> By the way I did use dual stack some years ago, and I cannot now >> remember all the details, but I think I may have had to bind on >> in6addr_any (which in dual stack would cover INADDR_ANY) or on ::1 >> (which would cover 127.0.0.1) to get dual stack to work. I suggest you >> play around with it to see. >>=20 >> One other correction: when I said there was a mapping to ::::ffff: >> 1.2.3.4 I meant ::ffff:1.2.3.4. > > You have stimulated my interest and this is what I have found. First, > in C the correct call in linux to do what you want to obtain a dual > stack socket is to set the IPV6_V6ONLY option in the IPPROTO_IPV6 level > to 0 (off). However neither IPV6_V6ONLY nor IPPROTO_IPV6 is defined in > guile, so you have to enter the numeric values for your OS by hand. In > linux this will do it in guile, but of course it is non-portable: > > (setsockopt [sock] 41 26 0) > > However, this only actually seems to accept a connection from a IPv4 > address if the socket binds to :: (which is in6addr_any, but > the in6addr_any symbol also appears not to be defined in guile). > Binding to ::1 (localhost) will not enable you to connect from > 127.0.0.1 on my computer. Whether binding to :: and so permitting any > interface to access the socket is OK for you depends on what your needs > are. If not then it looks as if you are stuck with having two sockets, > one for IPv4 and one for IPv6. Thank you for all your info! I seem to have working ipv4 and ipv6 access now! I found that IPV6_V6EONLY is off by default in my system cat /proc/sys/net/ipv6/bindv6only But I=E2=80=99m now setting it anyway, because that default might change. Best wishes, Arne =2D-=20 Unpolitisch sein hei=C3=9Ft politisch sein, ohne es zu merken. draketo.de --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJEBAEBCAAuFiEE801qEjXQSQPNItXAE++NRSQDw+sFAmHohuAQHGFybmVfYmFi QHdlYi5kZQAKCRAT741FJAPD6/bND/9TZQgRK28YI/MY0pmvJdDSdLKzuNhTthQl S/65tgwPYkMmcIWtFCgS/nj1NVs13NNAj5jx13DwoUqFygSbD4P32LdKIY9iimsL t1vuK/4X+Ycg1iZvNKRHXjSF2UHzwCk97GkmGiWpH/Cl16z81EU8xjioJ2vYxEv/ yGAJPA2wM/P9WSpobhlDoEZnRNBi1CK5A50y3MkGP1M5u4Z5OpyK3nGToijwIPXi t/7IoztgSJXYHVwrTlby1vUPj6Dav1KFeWgmAMU+30KulMdXZuRCjVkmjMayqSj1 iOvHMlK+WbsHWkkE5cngRKx3VVSzO/c8UHTP+I/Z0xITuJkIbvg49Mzj0dyvq2Wi +D2TSHrHZM36ncLO/NpH2H481pHp+7269PbyFlb9yTChykGrQjbVLXYrpWUHNDIB OuYCkGD7MPz21BKxcWHAE3XT5hKZTu7/MXasHbKbwQY6kq0IIMEKkKCNtI6Xveke WNaZ9fq2KJ//B/xzwvk0c1z6f8MfMEolOtG/kcAE0Vv0ZqD3mdaebreNzbh9y+bO wAApH6MoSuYW3MVWVfqS6VnFOy8EBRdDm9MiwBwxXhT/KpJywogphAY70ZY6F85A DTyYGSD2Zj9AbncSyr+Lqr4ixMeatrdYDeJGPafcBoziRBW0OOKMtkK2yROgLhz1 sxbGFkTQhYjEBAEBCAAuFiEE3Si95tmHXKvOSosd3M8NswvBBUgFAmHohuAQHGFy bmVfYmFiQHdlYi5kZQAKCRDczw2zC8EFSFLAA/0Rgeg+RryJKCQMLEUSAAs3yU7W xnPFCOlgIbjBlN1C+NTPCxm0LzO3uu13X1jTwxGfD45sXegOEdSd75BL2vzVAZY2 MNdOmYOxiFQFRFrBe+ImevNx8WHIDJpVkjDT9KKEtPGYb9OXuAlcSLzNLDtToLhC vHsrYuv/K0WNNUx0zQ== =J+2T -----END PGP SIGNATURE----- --=-=-=--