From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Chris Vine Newsgroups: gmane.lisp.guile.devel Subject: Re: (web server) serving on both ipv6 and ipv4? 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Wed, 19 Jan 2022 05:07:21 -0800 (PST) Original-Received: from bother.homenet (localhost [127.0.0.1]) by bother.homenet (Postfix) with SMTP id BCE9E2637CA for ; Wed, 19 Jan 2022 13:07:33 +0000 (GMT) In-Reply-To: <87k0ewi0w2.fsf@web.de> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-unknown-linux-gnu) X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::52a (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::52a; envelope-from=vine35792468@gmail.com; helo=mail-ed1-x52a.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 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_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.001, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:21035 Archived-At: On Wed, 19 Jan 2022 08:57:51 +0100 "Dr. Arne Babenhauserheide" wrote: > Hi, > > > with both fibers server and (web server) there is a split between IPv4 > and IPv6: > > IPv4: > > (fibers:run-server handler-with-path #:family AF_INET #:port port #:addr INADDR_ANY) > > (run-server handler-with-path 'http `(#:host "localhost" #:family ,AF_INET #:addr ,INADDR_ANY #:port ,port)) > > IPv6: > > (define s > (let ((s (socket AF_INET6 SOCK_STREAM 0))) > (setsockopt s SOL_SOCKET SO_REUSEADDR 1) > (bind s AF_INET6 (inet-pton AF_INET6 ip) port) > s)) > (fibers:run-server handler-with-path #:family AF_INET6 #:port port #:addr (inet-pton AF_INET6 ip) #:socket s) > > (define s > (let ((s (socket AF_INET6 SOCK_STREAM 0))) > (setsockopt s SOL_SOCKET SO_REUSEADDR 1) > (bind s AF_INET6 (inet-pton AF_INET6 ip) port) > s)) > (run-server handler-with-path 'http `(#:family ,AF_INET6 #:addr (inet-pton AF_INET6 ip) #:port ,port #:socket ,s)) > > > Is there a way to bind to both IPv6 and IPv4, so my server will react to > requests regardless of whether a client reaches my computer over IPv4 or > IPv6? 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. Then, if receiving a IPv4 connection from address 1.2.3.4, this would be mapped as ::::ffff:1.2.3.4. 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?).