HT5656 IPv6 Delegated Prefix doesn't stay set

Just as others have encountered after the upgrade to 7.6.3, the required field IPV6 Delegated prefix keeps getting unset. When I click on the error pessage about a broken IPv6 tunnel and click Edit, it highlights the remote IPv4 address, which is set according to the settings specified by tunnelbroker.net. Changing only the IPv6 delegated prefix field and clicking save then update doesn't prompt a reboot. I have to change some of the other fields for the reboot to take effect. My AirPort Extreme is circa 2007 and worked with the 7.6.1 firmware.

I have this problem as well. I have tried both /48 and /64 prefixes, but nothing will stay set. I have tried setting it to automatic, reboot, change to manual, enter in all new settings. Nothing seems to work.
Apple needs to address this issue with a fix. 7.6.3 is either still broken, or the Airport Utility app is broken. It's one of the two.

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HT5656 This is all great but for me the "IPv6 Delegated Prefix" field never sticks. After the reboot to apply the settings, it is empty again. I have tried the 6.2 Airport Utility on OS X 10.8.2 and the iOS Airport Utility. Any ideas?

Hi All,
   I had a working IPv6 tunnel with my Airport Express to tunnelbroker.net using the 7.6.1 firmware. After updating to 7.6.3, I have tried many things to get it to work and the only one that works is downgrading from 7.6.3 back to 7.6.1. After seeing this new technical note, it appears that the root of my issue is that I can not get the "IPv6 Delegated Prefix" field to stick - it is always empty after the reboot to apply the settings.
   Any ideas?
     Thanks,
       CraigN

I'm in the same boat with a 3rd Gen AEBS. Only thing I haven't tried is a complete reset and reconfiguration from nothing, which I may wind up doing this afternoon just to rule it out. The best irony of all of this is that tunnelbroker.net is under my responsibility, and I can't validate the new settings paradigm. At least getting back to 7.6.1 is easy enough and everything works fine there.
IPv6 Delegated prefix doesn't get saved when using the format from their example, then a 6to4 address shows up as the local address on the main Internet page, and no RAs are received once the AEBS comes back from a reload. Something's a little off on this release.

IPv6 prefix delegation with AVPair ipv6:delegated-prefix

Dear all
I have a LNS running c7200-adventerprisek9-mz.124-24.T4.bin.
I am trying to delegate IPv6 prefixes to vpdn users as described in
http://www.cisco.com/en/US/customer/prod/collateral/iosswrel/ps6537/ps6553/whitepaper_c11-602131.html#wp9000270
From this whitepaper: "When the delegating provider edge router supports RFC 4818, only one user profile is stored for the RADIUS server. In addition the RADIUS server may be configured with a DNS server per user, which overwrites the providers edge router's default DNS server address configured in the DHCP pool"
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   Service-Type = Framed-User,
   Framed-Protocol = "PPP",
   Framed-IP-Address = "10.0.0.1",
   Framed-IP-Netmask = "255.255.255.255",
   Framed-MTU = "1492",
   Framed-Compression = "Van-Jacobson-TCP-IP",
   Cisco-AVPair = "ipv6:prefix#1=201:DB8:F1:0::/64",
   Cisco-AVPair += "ipv6:delegated-prefix=201:DB8:AAAA::/48",
   Cisco-AVPair += "lcp:interface-config=mtu 1460"
If I try to connect this user I get the PPP-Link established with prefix 201:DB8:F1:0::/64 as expected. But instead of providing the delegated prefix from the AVPair the router queries the radius server again for the user user@foobar-dhcpv6pd which I have not configured since I assume that this router "supports RFC 4818", right?
So why does it as for user@foobar-dhcpv6pd ?
Thanks for any hint,
Grischa

Hi,
RFC4818 is supported starting with 15.1(1)T or later. 151-2.T2a seems to have an issue though.
HTH
Laurent.

IPv6 Delegated Prefixes no longer working?

ATTENTION PeterGrace
Your post was removed to a secure area out of public view because it violates forum posting guidelines.
Forum Guidelines state >>> clickable link http://forums.comcast.com/t5/Forum-Guidelines/Posting-Guidelines/td-p/866289 which everyone should read BEFORE making a first post
Please don't;
Post personal information in the forums
Please do your best to keep your identity and personal information safe. This includes:
Your full name
Your telephone number
Your Physical/Mailing Address
Email addresses
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Account numbers
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Modem MAC address and / or serial number <<<<<<<<<<<<<<<<<<<<<
Active phishing links
Other personally identifiable information
Here is your post with the information removed;
Hi there!
Has Comcast stopped assigning delegated prefixes for users who request them? I had my router setup to request a /60 via IA-PD but just today it appears to have stopped. I'm still getting an ipv6 address on the dhcpv6 solicit, but no more delegated prefixes. Thinking that the problem might be solved with a firewall software update, I upgraded to the latest release version but the same problem persists. Here's my IAID/DUID to aid in tracking down the issue.
IAID: XXXXXXXXX
DUID: XXXXXXXXXXXXXXXXXXXXXXXXXXX
EDIT: Cablemodem HFC MAC: XXXXXXXXXXXXXXXX (found on surfboard diagnostic page)
Let me know what other info I might provide to aid in diagnostics.
Thanks in advance!

Check my PM, I see PD being assigned to your device.
-Chirag

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(51259)

IPv6 Global Prefix RA question from R1 to R2

Hello,
I've a questiona about IPv6 Global Prefix RA.
I have 2 routers (r1 and r2) connected via fastethernet0/0 interface.
On the first router i have gone trough the ipv6 set up:
1. I have create a ipv6 address: #ipv6 address 2001:aaa:bbbb:cccc::/64 eui-64
2. told the router that it can route ipv6: #ipv6 unicast-routing
Below is a #show ipv6 interface on R1:
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::CA00:10FF:FE84:0
Global unicast address(es):
    2001:AAA:BBBB:CCCC:CA00:10FF:FE84:0, subnet is 2001:AAA:BBBB:CCCC::/64
Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF84:0
On the second router I have gone trough the ipv6 steps:
1. I have enable ipv6: #ipv6 enable.
I do see that the link-local address has been created: FE80::CA02:10FF:FE84:0
Below is a # show ipv6 interface on R2:
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::CA02:10FF:FE84:0
No global unicast address is configured
Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF84:0
My question is as follows: why doesn't get Router2 the global prefix information in the ipv6 address from Router 1
I do see a RA send from R1 to R2.
R1#
*Mar 1 00:40:37.455: ICMPv6-ND: Sending RA to FF02::1 on FastEthernet0/0
*Mar 1 00:40:37.455: ICMPv6-ND:     MTU = 1500
*Mar 1 00:40:37.455: ICMPv6-ND:     prefix = 2001:AAA:BBBB:CCCC::/64 onlink autoconfig
*Mar 1 00:40:37.455: ICMPv6-ND:             2592000/604800 (valid/preferred)
*Mar 1 00:40:37.455: IPV6: source FE80::CA00:10FF:FE84:0 (local)
*Mar 1 00:40:37.455:       dest FF02::1 (FastEthernet0/0)
*Mar 1 00:40:37.455:       traffic class 224, flow 0x0, len 104+1396, prot 58, hops 255, originating
*Mar 1 00:40:37.455: IPv6: Sending on FastEthernet0/0
R2(config)#
*Mar 1 00:39:42.275: ICMPv6-ND: Received RA from FE80::CA00:10FF:FE84:0 on FastEthernet0/0
What I also see is that R1 is getting RA from R2:
R1#
*Mar 1 00:47:56.199: ICMPv6-ND: Received RA from FE80::CA02:10FF:FE84:0 on FastEthernet0/0
Thank I great advance,
Lino

Hi Lino,
My question is as follows: why doesn't get Router2 the global prefix information in the ipv6 address from Router 1
You need to configure "ipv6 address autoconfig". When you have it enabled, IPv6 router on receiving RA will get the prefixes with A flag set and will append 64 bit Interface ID.
What I also see is that R1 is getting RA from R2:
Per my understanding, RA is not only for stateless autoconfiguration. SLAAC is one benefit from RA while there are otehr benefits like MAC learning, default router advertisement etc..
Thanks,
Nagendra

[solved] tmux rebinding prefix doesn't work?

Hi everybody,
I decided to try tmux out, so I installed it and played around with it abit ... okay, it's pretty neat, but I've got to bind the keys to the same way I bound them for screen or I will go insane, so copy and paste, from the man page:
Commands to be run when the tmux server is started may be placed in the ~/.tmux.conf configuration file. Common examples include:
Changing the default prefix key:
set-option -g prefix C-a
unbind-key C-b
bind-key C-a send-prefix
So I stick
set-option -g prefix C-a
unbind-key C-b
bind-key C-a send-prefix
in ~/.tmux, that unsets the "C-b" binding, (so I can't do anything), but it doesn't bind "C-a" successfully. Has anybody here successfully rebound their prefix?
Last edited by pseudonomous (2010-04-09 22:16:14)

Hi, Jasonwryan. Thanks for your response.
It turns out the problem was tmux wasn't automatically reading ~/.tmux, if I pass
tmux -f ~/.tmux
then I can get your config to work, I'll be the example from the man page works too.
Edit:
To elaborate on this problem, the file is supposed to be called "tmux.conf", not tmux. This is what I get for not reading carefully enough.
Last edited by pseudonomous (2010-04-09 22:22:20)

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IOS 12.2(33)SXI2a ipv6 nd prefix command

Hi!
I've encountered a problem trying to configure something like this in a Sup720 with IOS 12.2(33)SXI2a:
router(config-if)#ipv6 address 2001:DB8:CAFE:CAFE::1/56
router(config-if)#ipv6 nd prefix 2001:DB8:CAFE:CAFE::/64
so the idea is to have a routed /56 for an interface, but a /64 for autoconfiguration of host interfaces. I've tried this first in a 12.2(31)SGA1, and it worked, but int the sup720 it renders an error:
%VlanXX: Error: 2001:DB8:CAFE:CAFE::/64 is overlapping with 2001:DB8:CAFE:CAFE::1/56. This error didn't appear in the 12.2(31)SGA1, and, in fact, we could route with any of the addresses in the range /56 configured in a server's interface, but at the same time, get one from autoconfig with a /64.
So, am I doing anything wrong, or is this the normal behaviour of the nd prefix command? If so, what's then its purpouse?
Thanks in advance,

Well, maybe I didn't explain it very well. In fact, it's the opposite that you comment: what we want is the servers to get an auto /64 address from the same /64. Then each customer can assign statically any address they want to their server from a different /64 for each customer. All these /64 belonging to the same /56 that we configure in the vlan interface, dynamically routed through OSPF. This way, we have not to configure any static address.
I admit that for this to be secured we need something like RA Guard and IPv6 PACL in the access switches, which the Cat2960 we use for the servers doesn't have available yet. We trust someday they will get the funtionality.
This is an example of the configs:
interface Vlan59
ipv6 address 2A02:BE8:2:1000::2/56
ipv6 enable
ipv6 traffic-filter PRUEBAS-IPV6 out
ipv6 nd prefix 2A02:BE8:2:1000::/64
ipv6 ospf 1 area 0
In the server:
eth0      Link encap:Ethernet HWaddr 00:1e:c9:bb:ca:36
          inet6 addr: 2a02:be8:2:1001::65/64 Scope:Global ----> manual
          inet6 addr: 2a02:be8:2:1001::66/64 Scope:Global ----> manual
          inet6 addr: 2a02:be8:2:1001::67/64 Scope:Global ----> manual
          inet6 addr: 2a02:be8:2:1001::1254/64 Scope:Global ----> manual
          inet6 addr: 2a02:be8:2:1000:21e:c9ff:febb:ca36/64 Scope:Global ----> SLAAC
          inet6 addr: fe80::21e:c9ff:febb:ca36/64 Scope:Link
Best regards,

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HT5656 IPv6 Delegated Prefix doesn't stay set

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