From owner-freebsd-net@freebsd.org Thu Jan 4 16:24:56 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CC6B8EC1644 for ; Thu, 4 Jan 2018 16:24:56 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [67.205.158.196]) by mx1.freebsd.org (Postfix) with ESMTP id A5C72720AB for ; Thu, 4 Jan 2018 16:24:56 +0000 (UTC) (envelope-from karl@denninger.net) Received: from denninger.net (ip68-1-57-197.pn.at.cox.net [68.1.57.197]) by colo1.denninger.net (Postfix) with ESMTP id 3DDB927502 for ; Thu, 4 Jan 2018 11:17:57 -0500 (EST) Received: from [192.168.10.23] (D13.Denninger.Net [192.168.10.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id 67B18107F17 for ; Thu, 4 Jan 2018 10:17:55 -0600 (CST) To: freebsd-net@freebsd.org From: Karl Denninger Subject: IP networking single socket, both IPv4 and V6? Message-ID: <2b3944fc-df1a-9998-876e-ad74f8cc073d@denninger.net> Date: Thu, 4 Jan 2018 10:17:51 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms000401010701080301060501" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Jan 2018 16:24:56 -0000 This is a cryptographically signed message in MIME format. --------------ms000401010701080301060501 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I've written a fair bit of code that binds to both Ipv4 and v6 for incoming connections, using two sockets (one for each.) Perusing around the 'net I see an implementation note written by IBM that implies that on their Unix implementation you can set up an INET6 listener and it will open listeners on *both* IPv4 and v6; you code it as an Ipv6 socket/bind/listen/accept, and if an Ipv4 connection comes in you get a prefix'd IPv4 address back when you call getpeername(). This would obviously shorten up code and remove the need to open the second listener socket, but playing with this on FreeBSD it doesn't appear to work -- I only get the IPv6 listener in "netstat -a -n" showing up and as expected a connection to a v4 address on that port fails (refused, since there's no listener.) Is this something that *should* work on FreeBSD? Ref: https://www.ibm.com/support/knowledgecenter/en/ssw_i5_54/rzab6/xacceptbot= h.htm --=20 Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms000401010701080301060501 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD dWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExJTAjBgNVBAMMHEN1 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