Issue with IPv6 address for www.freebsd.org

Wed Feb 27 14:17:11 UTC 2013

Kevin,

I found the issue. It is on Level3. Level3 gave away two /48 IPv6 subnet to his client, but when in their network, they summaries the subnet to /32. I do not believe they advertised out to the whole world an existing /48. I worked with another upstream provider whom their upstream is Level3, and they said they only see one /32. So, whoever use Level3 as their upstream provider will have issue accessing to these IPv6 subnet. I already worked with Level3 yesterday evening on this.

*  2001:1900::/32   2001:1890:FF:FFFF:12:122:125:6
                                                           0 7018 3356 i
*  2001:1900:2254::/48
                    2001:1890:FF:FFFF:12:122:125:6
                                                           0 7018 6939 10310 i
*  2001:1900:2262::/48
                    2001:1890:FF:FFFF:12:122:125:6
                                                           0 7018 6453 21775 i

Thanks,
Keng

From: Kevin Oberman <rkoberman at gmail.com<mailto:rkoberman at gmail.com>>
Date: Wednesday, February 27, 2013 3:02 AM
To: Keng Soon Goh <KengSoon.Goh at hughes.com<mailto:KengSoon.Goh at hughes.com>>
Cc: "freebsd-gnome at FreeBSD.org<mailto:freebsd-gnome at FreeBSD.org>" <freebsd-gnome at freebsd.org<mailto:freebsd-gnome at freebsd.org>>
Subject: Re: Issue with IPv6 address for www.freebsd.org

On Tue, Feb 26, 2013 at 4:19 PM, Keng Soon Goh <KengSoon.Goh at hughes.com<mailto:KengSoon.Goh at hughes.com>> wrote:
Kevin,

May I know where do you get this ipv6 address? I checked ARIN, and it belongs to Level3. But it does not seems to me when I try to traceroute to this address.

Thanks.
Keng Soon
________________________________________
From: kob6558 at gmail.com<mailto:kob6558 at gmail.com> [kob6558 at gmail.com<mailto:kob6558 at gmail.com>] On Behalf Of Kevin Oberman [rkoberman at gmail.com<mailto:rkoberman at gmail.com>]
Sent: Tuesday, February 26, 2013 7:05 PM
To: Keng Soon Goh
Cc: freebsd-gnome at FreeBSD.org<mailto:freebsd-gnome at FreeBSD.org>
Subject: Re: Issue with IPv6 address for www.freebsd.org<http://www.freebsd.org>

On Tue, Feb 26, 2013 at 1:59 PM, Keng Soon Goh <KengSoon.Goh at hughes.com<mailto:KengSoon.Goh at hughes.com><mailto:KengSoon.Goh at hughes.com<mailto:KengSoon.Goh at hughes.com>>> wrote:
Hi,

My name is Keng Soon Goh, and I work for Hughes Network Systems. One of my client try to access to you websites, and at some point, it does not go anywhere. I talked to Level3, and they said this subnet is belongs to them, but there is no routes at all. Are you planning to advertise this IPv6 address to the internet?

Thanks.
Keng

nslookup -q=aaaa www.freebsd.org<http://www.freebsd.org><http://www.freebsd.org>
Server: 172.27.0.9
Address: 172.27.0.9#53

Non-authoritative answer:
www.freebsd.org<http://www.freebsd.org><http://www.freebsd.org> canonical name = wfe0.ysv.freebsd.org<http://wfe0.ysv.freebsd.org><http://wfe0.ysv.freebsd.org>.
wfe0.ysv.freebsd.org<http://wfe0.ysv.freebsd.org><http://wfe0.ysv.freebsd.org> has AAAA address 2001:1900:2254:206a::50:0

Authoritative answers can be found from:
freebsd.org<http://freebsd.org><http://freebsd.org> nameserver = ns1.isc-sns.net<http://ns1.isc-sns.net><http://ns1.isc-sns.net>.
freebsd.org<http://freebsd.org><http://freebsd.org> nameserver = ns2.isc-sns.com<http://ns2.isc-sns.com><http://ns2.isc-sns.com>.
freebsd.org<http://freebsd.org><http://freebsd.org> nameserver = ns3.isc-sns.info<http://ns3.isc-sns.info><http://ns3.isc-sns.info>.

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Talk to your provider. I have no problem reaching it, so looks like your provider lacks a full IPv6 table.

> traceroute6 -f 5 2001:1900:2254:206a::50:0
traceroute6 to 2001:1900:2254:206a::50:0 (2001:1900:2254:206a::50:0) from 2001:400:910::29, 64 hops max, 12 byte packets
Skipping 4 intermediate hops
 5  eqxsjrt1-te-sunncr1  2.660 ms  2.611 ms  2.632 ms
 6  eqnx.pat1.sj6.yahoo.com<http://eqnx.pat1.sj6.yahoo.com><http://eqnx.pat1.sj6.yahoo.com>  2.808 ms  2.772 ms  2.793 ms
 7  routerer-ext.freebsd.org<http://routerer-ext.freebsd.org><http://routerer-ext.freebsd.org>  3.660 ms  3.651 ms  3.634 ms
 8  wfe0.ysv.freebsd.org<http://wfe0.ysv.freebsd.org><http://wfe0.ysv.freebsd.org>  3.848 ms  3.803 ms  3.691 ms

I'm now confused. The address is the one in your message. It was in tte response to the nslookup you copied into your message  The address is from a L3 block, but is being announced by Yahoo!. We peer directly with Yahoo! in San Jose (and other places). I see no indication that Level(3) is involved in any way other than owning hte net block that Yahoo uses.

I don't have IPv6 at home, but the HE looking glass also routes to an Equinix exchange and directly to yahoo and on to www.freebsd.org<http://www.freebsd.org>. If I try to trace from a Level(3) looking glass, it fails. something very odd id going on. Looks like Level(3) forgot that the address was assigned to FreeBSD and is not accepting the Yahoo! route or something similar.
--
R. Kevin Oberman, Network Engineer
E-mail: rkoberman at gmail.com<mailto:rkoberman at gmail.com>