7.3.1 firmware breaks 6to4 IPv6 connectivity

Can others confirm that the 7.3.1 firmware breaks connectivity to various 6to4 sites? I reverted to 7.2.1 and my connectivity is restored. I'm a Comcast customer in the USA, so the Airport "helpfully" prevents me from using a static tunnel with DHCP-assigned WAN addresses, thus I'm stuck with 6to4.
It appears as though the 7.3.1 firmware drops inbound 6to4-encapsulated traffic if the IPv4 wrapper source address is not 192.88.99.1, the 6to4 relay anycast address per RFC 3068. Whilst it's correct to send to this address (and only a minor irritation that it can't be overriden) it's wrong to insist that return traffic come from this, since it's effectively a "virtual" address, by virtue of being anycast and advertised by any helpful IPv6 network operator. It's good practice for 6to4 relays returning traffic to use their "real" IPv4 address for accountability.
Examples of broken sites:
https://6to4.nro.net/ (so no reverse DNS registration possible)
http://www.ja.net/
http://www.exim.org/
Return traffic goes via the 6to4 relay handling 2002::/16 which is nearest, IPv6-network-wise, to the node sending back the traffic; so traceroute6 starts showing "* * *" at the point where the remote side is using a 6to4 relay that believes in accountability and is thus rejected by 7.3.1 firmware.
This is all by my observations, with the help of some IPv6 network operators and various looking-glass traceroutes. The lack of ability to sniff external traffic with an Airport somewhat hinders local diagnosis.
Can anyone confirm or deny this? Or offer hope of this regression being fixed?
Thanks,
-Phil

Hi Phil,
I'm just confirming that I have noticed the same problem. With the help of a colleague, we setup two AEs (AirPort Extreme) at different sites. Each had a global IPv4 address so it could give its children "2002::/16" addresses (note, if the AE doesn't get a global IPv4 address on its WAN, it won't respond to router solicitations on the LAN). We then attempted to get a child from one network to contact a child in the other, but failed because the destination AE would return an ICMP "destination unreachable" message. If we downgrade the destination AE to 7.2.1, then communication works perfectly. The behaviour from version 7.2.1 seems like what's intended for a 6to4 tunnel, so I'm puzzled why the Apple engineers would take this out.
Regards,
Shaun

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Additional data&colon;
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Help, learn and share

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Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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IPv6 connectivity through AEBS to HE

Hi,
I have upgraded my AEBS to 7.5.2 and am trying to get IPv6 connectivity to HE. The HE tunnel configuration is :
IPv6 Tunnel Endpoints
Server IPv4 address: 66.220.18.42
Server IPv6 address: 2001:470:c:c77::1/64
Client IPv4 address: 71.139.20.48
Client IPv6 address: 2001:470:c:c77::2/64
Available DNS Resolvers
Anycasted IPv6 Caching Nameserver: 2001:470:20::2
Anycasted IPv4 Caching Nameserver: 74.82.42.42
Routed IPv6 Prefixes and rDNS Delegations
Routed /48: 2001:470:f2e6::/48
Routed /64: 2001:470:d:c77::/64
AEBS V6 setup is:
IPv6 mode = Tunnel
Block incoming ipv6 connections
config ipv6 = manually
remote ipv4 addr. = 66.220.18.42
wan ipv6 addr. = 2001:470:c:c77::2
ipv6 default route = 2001:470:c:c77::1
lan ipv6 addr. = 2001:470:d:c77::1
Imac is set to get v6 addr automatically and the config is:
Kens-iMac:~ ken$ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
inet6 fd92:20e4:f390:f1d9:d69a:20ff:fec1:aa98 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0 mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether d4:9a:20:c1:aa:98
inet6 fe80::d69a:20ff:fec1:aa98%en0 prefixlen 64 scopeid 0x4
inet 192.168.1.6 netmask 0xffffff00 broadcast 192.168.1.255
inet6 2001:470:d:c77:d69a:20ff:fec1:aa98 prefixlen 64 autoconf
media: autoselect (1000baseT <full-duplex,flow-control>)
status: active
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
lladdr d4:9a:20:ff:fe:c1:aa:98
media: autoselect <full-duplex>
status: inactive
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether d4:9a:20:5c:2e:b7
media: autoselect (<unknown type>)
status: inactive
vmnet8: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 00:50:56:c0:00:08
inet 172.16.96.1 netmask 0xffffff00 broadcast 172.16.96.255
vmnet1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 00:50:56:c0:00:01
inet 172.16.202.1 netmask 0xffffff00 broadcast 172.16.202.255
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
inet6 fe80::d69a:20ff:fec1:aa98%utun0 prefixlen 64 scopeid 0x9
inet6 fd00:6587:52d7:42:d69a:20ff:fec1:aa98 prefixlen 64
Netstat -r is
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.1 UGSc 20 0 en0
127 localhost UCS 0 0 lo0
localhost localhost UH 4 60028 lo0
169.254 link#4 UCS 1 0 en0
169.254.1.0 link#4 UHRLW 1 1350 en0 6
172.16.96/24 link#7 UC 1 0 vmnet8
172.16.96.255 link#7 UHLWbI 1 682 vmnet8
172.16.202/24 link#8 UC 1 0 vmnet1
172.16.202.255 link#8 UHLWbI 2 681 vmnet1
192.168.1 link#4 UCS 3 0 en0
192.168.1.1 0:1e:52:f0:5e:a2 UHLWI 20 20 en0 855
192.168.1.6 localhost UHS 0 0 lo0
192.168.1.38 0:22:41:1b:25:b4 UHLWI 0 0 en0 856
192.168.1.255 link#4 UHLWbI 1 681 en0
Internet6:
Destination Gateway Flags Netif Expire
default kens.local UGSc en0
localhost localhost UH lo0
2001:470:d:c77:: link#4 UC en0
2001:470:d:c77:d69 d4:9a:20:c1:aa:98 UHL lo0
fd00:6587:52d7:: fd00:6587:52d7:42: UGCS utun0
fd00:6587:52d7:42: fd00:6587:52d7:42: UGHW utun0
fd00:6587:52d7:42: link#9 UHL lo0
fd92:20e4:f390:f1d link#1 UHL lo0
fe80::%lo0 localhost Uc lo0
localhost link#1 UHL lo0
fe80::%en0 link#4 UC en0
playme.local 0:11:24:6f:9:5e UHLW en0
kens.local 0:1e:52:f0:5e:a2 UHLW en0
kens-imac.local d4:9a:20:c1:aa:98 UHL lo0
fe80::%utun0 fe80::d69a:20ff:fe Uc utun0
fe80::d69a:20ff:fe link#9 UHL lo0
ff01:: localhost Um lo0
ff02:: localhost UmC lo0
ff02:: link#4 UmC en0
ff02:: fe80::d69a:20ff:fe UmC utun0
But the problem is that I can't ping or resolve IPv6 names, although I can ping the local side of the ipv6 tunnel
Kens-iMac:~ ken$ ping6 2001:470:c:c77::1
PING6(56=4088 bytes) 2001:470:d:c77:d69a:20ff:fec1:aa98 --> 2001:470:c:c77::1
Request timeout for icmp_seq=0
Request timeout for icmp_seq=1
Request timeout for icmp_seq=2
Request timeout for icmp_seq=3
Request timeout for icmp_seq=4
^C
--- 2001:470:c:c77::1 ping6 statistics ---
6 packets transmitted, 0 packets received, 100.0% packet loss
Kens-iMac:~ ken$ ping6 2001:470:c:c77::2
PING6(56=4088 bytes) 2001:470:d:c77:d69a:20ff:fec1:aa98 --> 2001:470:c:c77::2
16 bytes from 2001:470:c:c77::2, icmp_seq=0 hlim=64 time=6.498 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=1 hlim=64 time=0.335 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=2 hlim=64 time=0.365 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=3 hlim=64 time=0.364 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=4 hlim=64 time=0.368 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=5 hlim=64 time=0.334 ms
16 bytes from 2001:470:c:c77::2, icmp_seq=6 hlim=64 time=0.371 ms
^C
--- 2001:470:c:c77::2 ping6 statistics ---
7 packets transmitted, 7 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.334/1.234/6.498/2.149 ms
and traceroute6 ...
Kens-iMac:~ ken$ traceroute6 ipv6.google.com
traceroute6 to ipv6.l.google.com (2001:4860:8010::93) from 2001:470:d:c77:d69a:20ff:fec1:aa98, 64 hops max, 12 byte packets
1 2001:470:d:c77::1 0.372 ms 0.392 ms 0.333 ms
2 * * *
3 * * *
4 * *^C
does anyone have any ideas on what is not working and why ?

Looks like an AT&T PPPOE connection - the addresses of those change all of the time. Make sure that the "Client IPv4 address" is correct at the HE side.
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Ipv6 connection problem on flash

hi all
I am using as3 code for the connection to my flash server application(red5-written in java)
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Thanks
[1] - http://livedocs.adobe.com/flashmediaserver/3.0/docs/help.html?content=03_configtasks_29.ht ml
[2] - https://bugs.adobe.com/jira/browse/FP-4526

Hi,
So i try on other flash builder editor and it's not working to.
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In the upper right menu bar of the Finder there is the icon showing the strength of the Airport wireless signal and just to the right of it is information on how long my Airport Extreme Base Station has been active (2d 11:38:41).
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When I am syncing with Apple TV this becomes more constant and this information disappears from the screen about every three seconds.
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I too experienced grief after installing Apple's "AirPort Base Station Firmware Update 7.4.1".
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Another curious symptom was that I noticed the hardcoded IP address for my laptop somehow got changed to a non-sense IP address (I hardcode it and don't rely on DHCP). Another curious symptom was that I noticed that the hardcoded DNS server's IP address was GONE.
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Does Apple really test this "crap" before they release it?

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KPN speedtest (NL): Cisco 408 (D), 570 (U) , Fritzbox 505 (D), 540 (D)
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KPN: cisco 114 (D), 132 (U), Fritzbox 483 (D), 404 (U)
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Now before I wouldn't notice as my primairy Wan connection was only 100 mbs and the secondairy is only 40/4. But now that my primairy is 500/500 I would like to at least closely utilize it's potention.
But alas, the Cisco doesn't allow me to reach this potention, The fritzbox does, but that's no option as it doesn't have dual wan.
Is there anything I have to tweak to get better results, or is this an issue in the firmware ?
edit: to add, the testing has been done around the same time, with the exact same equipment and cabling, the only difference is the router itself, all the other variables are the same.

No- the other ones are 32bit and older kernels (not as bleeding edge as Arch). I tried the legacy 2.6 kernel in Arch and the delay is still there.
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Hey Guys,
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but how does it know to go to 2002:303:303: automatically........
Im assuming that R1 has physical IP going to R2 of 1.1.1.1 and R2 has a physical IP of 2.2.2.2 going to R1.

In the classic 6to4 scenario, you would be depending on the existence of two additional 3rd party relay routers. The relay routers would be anycasting 192.88.99.0/24 on the v4 side and 2002::/16 on the v6 side. Typically the sending client would only have v4 connectivity, not v6. Some operating systems build in 6to4 tunneling, and some endpoints might be dual-stack, so the number of relays could be reduced.
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    2. R1 -> dual stack relay A (advertising 192.88.99.0/24) via v4
    3. relay A -> v6 destination via R2
    4. R2 -> destination server (v6)
On the reply path,
    5a dual-stack server with embedded 6to4 encapsulates reply directly to client IPv4 address via R2
or
    5b IPv6-only server sends native v6 reply to relay B at 2002::/16 via R2 using IPv6
    6a R2 forwards v4 packet toward final destination
    6b R2 forwards v6 packet toward dual stack relay B (advertising 2002::/16)
    7a relay B is not involved if the server did its own 6to4 encapsulation
    7b relay B encapsulates the v6 packet in a v4 envelope addressed to the decoded v4 address of the client
    8 R1 receives a v4 encapsulated packet via either R2 or relay B, depending on step 5 choice
    9 client decapsulates v6 reply from v4 envelope received from R1
Geof Huston and others have described why automatic tunnels like Teredo and 6to4 are a bad idea, e.g.
http://www.potaroo.net/ispcol/2010-12/6to4fail.html
-- Jim Leinweber, WI State Lab of Hygiene

Updating Media Hub firmware *without* an Internet connection? (+ A few other questions)

Hi everyone! :-)
I recently purchased an NMH305 in the DSG retail stock clearance, which I am planning on using as a "Black hole" for my audio, video and software collections. Before I begin setting it up though, I need to check on a few things and ask a few questions. :-)
First things first, here's a brief overview of my network and some other stuff:
My network has no connection to the Internet whatsoever. I was previously online with a major UK ISP, but because of numerous connection issues and the fact that a direct connection has negative impacts on my lifestyle, I decided to get rid of it and do without.
Consequently, all of my access to the Internet (E.G: Posting here) is done through local libraries and friends connections.
Most of my systems run Windows XP, but I also have a few Ubuntu, Fedora, and OEM firmware based clients knocking around as well. Windows VII and/or a mass switch-over to Linux may occur in the future.
All network clients are wired up with 100mbps fast ethernet (No wi-fi)
My Media Hub currently has it's 500GB WD Green Caviar installed, but my plan is to replace this with two 500GB 7200rpm Hitachi drives stripped out of USB external caddies for quicker access times, greater peace of mind (I don't really trust Western Digital products) and use the more efficient Caviar as an external HDD insted.
Because I like to keep my systems as "light" as possible; I'd like to skip using the bundled set-up CD (Which'll install a lot of stuff that I don't need) and insted set-up the Media Hub manually using a web browser or terminal connection.
I consider myself to be an experienced and advanced user, and therefore I'm comfortable with the idea of configuring and operating my Media Hub via an SSH or Telnet session.
Downloading, backing-up and restoring Firmware by hand:
Anyhow...The first question I'd like to ask is How can I backup and update the firmware on my media hub using only my local network? I know full well that I can download the firmware images using just a web browser, but I cannot seem to find a direct URL anywhere on the Linksys site. The closest lead I've got so far is http://downloads.linksysbycisco.com/downloads/firmware/NMH_FW_3_18_15_B_ReleaseNotes.txt...But no logical variations of this URL that I've tried (Drop the _ReleaseNotes.txt, try .bin .img .tar .tgz and .tar.gz extensions) have resulted in success. :-(
If anyone has the direct URLs for the firmware images, I'd be most greatful. Failing that, if anyone can tell me the URL that the Media Hub uses to perform a version check (A few packets dumped via WireShark during a check will do) I can follow the HTTP chain from there by hand. :-)
Naturally, I'm assuming that there is a means by which to dump and upload firmware to/from the Media Hub (Via an SSH session, most likely) but if not, would serving the firmware update from one of my own systems (Using a record on my local DNS) work, or does the Media Hub use a secure connection for this?
Operating the Media Hub via SSH/Telnet:
As the Media Hub runs a customised version of Linux, I presume that administration via Telnet and SSH are available. I assume that the default login would be root / admin (I'm assuming the web interface also uses the root account for it's administrative logon) but is that correct...Or would I need different credentials to those for a Telnet/SSH login?
Installing new HDDs: Anything need keeping off the old one?
Finally; As I mentioned above, I'm planning to swap the OEM drive supplied with two others before use. I'm currently leafing through the users manual and am about to come across the procedure given for drive replacement, but given the size of the Media Hub's UI - Which looks to me to be pretty heavily featured - I doubt the whole lot would fit on the Hub's firmware flash...So presumably I'd need to back-up interface data and files from the OEM disk to the new disks first.
Dumping data from one disk to another isn't a problem (dd has become one of my favourite utilities over the past year) but - Thinking from the viewpoint of efficiency - Is it possible to restore the UI data and interface alone (No media lists or cache info - That's better regenerated after) without having to dump the first x sectors from one disk to another?
Also; Given the unit comes with a 5400rpm WD Green Caviar, will the Media Hub's PSU handle two standard 3.5" HDDs (Which could draw about 15-20w each) without problems? :-)
Farewell for now, apologies for the length of this post, and many thanks in advance for any help! >:-)
+++ DieselDragon +++

Check out the posts here and another one here .
Better check with the hardware tested list below for the harddrives.
NMH Series Hardware Tested List
Cheers.

IPv6 Connectivity limited ??

I am wondering whether anyone can help me with this one please ?
We have recently had massive problems with slow broadband speeds. We have home hub 1 so have had the hub for a while now and have never had a problem with speed until the last month or so.
What I have noticed is that our wireless network connection status says that:
Our IPv4 Connectivity is Internet and the IPv6 is limited..
This I can see is the problem because when IPv6 is limited the internet is very slow, ie videos are impossible to watch, however IPv6 normally says Local??
Any ideas how to change this back to local from limited ?? and any ideas why this connectivity keeps changing ?
Thanks

Unless I am mistaken, Home Hub 1 will only deal with IP version 4. Even the connection into the Internet is IP version 4. IP version 6, even though implemented by some Broadband companies such as in France, is not used by BT.
The DHCP on your Home Hub, this is what gives your computer its network address cannot even issue an IPv6 address.
It is most likely that this is something that is being generated by your PC. If for some reason you are running IPv6 within your network, the router into the internet will strip off the first part of the IP address so that it is now an IPv4 address.
If you believe it is IPv6 causing a problem, you can turn it off in the software on your PC. I presume it is XP or later as that was the first to offer IPv6 in addition to IPv4. I would be guessing where it is located on your machine but typically it will be in control panel and network.

7.3.1 firmware breaks 6to4 IPv6 connectivity

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