Date: Thu, 23 Oct 2014 09:49:06 -0400 From: Jon Radel <jon@radel.com> To: freebsd-questions@freebsd.org Subject: Re: IPv6 aliases on FreeBSD 10 Message-ID: <54490752.7080504@radel.com> In-Reply-To: <CANNwXrZ75XtVv84adpum-DU_kf=KjuJfnFpuhZucXJhqBT3K%2Bw@mail.gmail.com> References: <CANNwXrYNw3bdnXDLdEVDhfWBxn2wu1Joyd3WpobweHDjUzFfgQ@mail.gmail.com> <5447AD3F.8060304@bytecamp.net> <CANNwXra7nhsH4m52-SX2PqBwHLP1NoqtZmGx-MF4B8VE8HJFTQ@mail.gmail.com> <CANNwXrZ75XtVv84adpum-DU_kf=KjuJfnFpuhZucXJhqBT3K%2Bw@mail.gmail.com>
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This is a cryptographically signed message in MIME format. --------------ms040802010203050208090401 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 10/23/14, 1:19 AM, pepe wrote: > prefix 128 didn't work either. only first real address is working. none= of > the aliases work with 48, 64 or 128... > our network is 2001:14b8:1801::/48 so that prefixlen 48 is right for ::= 1 > address isn't it? and well, it works so > I think it is right... > It would be rather unusual to have a /48 there. There are many things=20 in IPv6 that assume you're using a /64 network on each LAN segment /=20 collision domain / however-you-want-to-think-of-it. So while, in some=20 senses, using a /48 there isn't *wrong*, after all, one might need to=20 have 1.208 x 10^24 addresses on a single LAN segment [but so much else=20 would break], in your case it's probably wrong. Things will probably go more smoothly in general if you use=20 IPv6-think: You were assigned 2^16 (65,536) networks (each a /64). =20 You were *not* assigned 2^80 addresses. (Obviously you were actually=20 assigned 2^80 addresses, but that's really not a useful way to think of=20 IPv6 addresses when planning your network.) Assign a /64 to the network this machine is connected to. Obviously=20 other equipment has to play along and have a matching prefix length. You might also want to show us what is in your rc.conf, not just what=20 ifconfig reports. Here's an example from an 8.3 server: ipv6_ifconfig_fxp0=3D"2001:470:880a:5237::10:1 prefixlen 64" ipv6_ifconfig_fxp0_alias0=3D"2001:470:880a:5237::12:1 prefixlen 128" ipv6_ifconfig_fxp0_alias1=3D"2001:4830:1707:5237::10:1 prefixlen 64" ipv6_ifconfig_fxp0_alias2=3D"2001:4830:1707:5237::12:1 prefixlen 128" ipv6_defaultrouter=3D"2001:470:880a:5237::1" That works fine. --Jon Radel jon@radel.com --------------ms040802010203050208090401 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIILBDCC BRowggQCoAMCAQICEG0Z6qcZT2ozIuYiMnqqcd4wDQYJKoZIhvcNAQEFBQAwga4xCzAJBgNV BAYTAlVTMQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3Qu Y29tMTYwNAYDVQQDEy1VVE4tVVNFUkZpcnN0LUNsaWVudCBBdXRoZW50aWNhdGlvbiBhbmQg 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