From owner-freebsd-questions@freebsd.org Wed Jul 8 20:46:17 2015 Return-Path: Delivered-To: freebsd-questions@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 3032A997662 for ; Wed, 8 Jul 2015 20:46:17 +0000 (UTC) (envelope-from jon@radel.com) Received: from radel.com (fly.radel.com [70.184.242.170]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "*.radel.com", Issuer "COMODO RSA Domain Validation Secure Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id D264338E5 for ; Wed, 8 Jul 2015 20:46:16 +0000 (UTC) (envelope-from jon@radel.com) X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.18.7 (ClamAV engine v0.98.7) Received: from [2001:470:880a:4389:9189:174c:bf5:84c7] (account jon@radel.com HELO gravenstein.local) by radel.com (CommuniGate Pro SMTP 6.1.2 _community_) with ESMTPSA id 801906; Wed, 08 Jul 2015 20:46:07 +0000 Subject: Re: IPv6 prefix delegation over a freebsd router that sits between internet router and local network To: Matthias Fechner , freebsd-questions@freebsd.org References: <559D6E16.3020305@fechner.net> From: Jon Radel Message-ID: <559D8C0F.6070001@radel.com> Date: Wed, 8 Jul 2015 16:46:07 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.0.1 MIME-Version: 1.0 In-Reply-To: <559D6E16.3020305@fechner.net> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms060206080109040908000502" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Jul 2015 20:46:17 -0000 This is a cryptographically signed message in MIME format. --------------ms060206080109040908000502 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 7/8/15 2:38 PM, Matthias Fechner wrote: > I'm using an internet connection from mnet (a German internet provider)= =2E > > The fritzbox 7490 will get an /56 IPv6 prefix that changes every 24 hou= rs. Yuck, that doesn't exactly seem to be in keeping with the spirit of=20 IPv6. Out of complete curiosity, rather than of any utility in solving=20 your problem (unless you convince them to stop doing that and give you a = permanent /56), do they say why they won't give you permanent=20 addresses? I'd hazard a guess that either they don't know what they're=20 doing and/or they're deliberately crippling things in order to encourage = you to pay for a higher tier of service...... > > Behind the fritzbox I have a FreeBSD router with two network interfaces= =2E > > Internet > | > Fritzbox 7490 internet interface > Fritzbox 7490 local interface | in a normal IPv6 network you'd want a /64 here; right now the FreeBSD=20 box is likely learning either the /56 or a /64 in it via Router=20 Advertisements (RAs) from the Fritzbox. "ifconfig re0" would tell you=20 which. | > | > Freebsd interface re0 > Freebsd interface em0 | and in a normal network (if routing) you'd want a different /64 here;=20 right now it looks like you have only the Link-Local addresses on this=20 segment, which FreeBSD will quite correctly refuse to route to the Intern= et | > | > Internal lan > > The network interface in the fritzbox is configured to forward the pref= ix. > If I check the interfaces the re0 (interface to fritzbox) is getting an= > ipv6 address and I can ping6 from the freebsd machine without problems.= Good. > > But if I try to to ping from a computer in "Internal lan" it fails. > The internal pc resolves the hostname to ipv6 adress Presumably using IPv4 for name resolution.....unless you're running a=20 resolver on the FreeBSD box. Or I'm very confused. > but the freebsd > machine shows in /var/log/messages: > Jul 8 20:33:01 server kernel: cannot forward src > fe80:1::88d:dbdc:2c49:ac3a, dst , nxt 58, > rcvif em0, outif re0 FE80::/10, Link Local, addresses are good only in a single collision=20 domain and can't be routed. So if the second device on the internal LAN = has only that address, this is as it should be. Things I'd consider: 1) Use the FreeBSD box as a bridge instead of a router and let the=20 Fritzbox hand out addresses to the internal LAN using RA/SLAAC, DHCPv6=20 or whatever it's actually doing. 2) Have a chat with your ISP 3) Build some horrible kludge to assign a /64 out of the /56 to the em0 = interface every time the ISP changes the /56... --Jon Radel jon@radel.com --------------ms060206080109040908000502 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC Cq8wggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4 dGVybmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290 MB4XDTE0MTIyMjAwMDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYD 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