Date: Wed, 8 Jul 2015 16:46:07 -0400 From: Jon Radel <jon@radel.com> To: Matthias Fechner <idefix@fechner.net>, freebsd-questions@freebsd.org Subject: Re: IPv6 prefix delegation over a freebsd router that sits between internet router and local network Message-ID: <559D8C0F.6070001@radel.com> In-Reply-To: <559D6E16.3020305@fechner.net> References: <559D6E16.3020305@fechner.net>
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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 <target-ipv6-address-i-ping>, 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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