6to4 Addresses vs Regular IPv6 Addresses - Confusion

Hi All, (Apologies if this question appears twice. Apparently I had an interface problem)
I'm finishing up my studies on the IPv6 portion of the CCNA material, and my book seems to completly ignore the fact that 6to4 addresses seem to look different than how the rest of the chapter portrays IPv6 addressing. I've done google searches, and unfortunately I don't have anyone at work who is versed enough in this who will know, so I'm hoping someone can help.
1. A normal IPv6 address: 2001:0db8:3c4d:0012:0000:0000:1234:56ab
   The same address in shorthand: 2001:db8:3c4d:12::1234:56ab
   A /64 of this space with autoconfiguration: 2001:db8:3c4d:12::/64 eui-64
   All of these addresses have, or will have 8 octets if written in long-hand, in other words - a valid IPv6 address.
Here's my problem: The addresses in the 6to4 section look like this:
   ipv6 address 2001:db8:2:2::1/64
The book fails to mention what the "1" before the /64 is for, but I am assuming that it is an identifier and not part of the IPv6 address due to the " :: "   However, if this is the case, I only see 4 octets, and no eui-64 command, directing that the other 4 will be populated by the MAC padded. And the "ipv6 address" syntax leads me to believe that this is a host address, and not a block/space statement (i.e. "ip address 192.168.0.1. 255.255.255.0," as opposed to "network 192.168.0.0 255.255.255.0)."
If someone could shed some light on this, it would be most appreciated, as it is very confusing.

Also, 6to4 IPv6 addresses have the IPv4 address of the 6to4 gateway embeded in them as well. That is why they have a whole reseved block of 2002:/16. Any gateway can algorithmically extract the IPv4 address for forwarding.
2002:0b0c:0205:5/48 for example, would be correlated to IPv4 address 11.12.2.5 (which is the decimal of the IPv4 address 0b0c:2025 shown in hex)
Earl Carter wrote a nice blog article on the general topic of IPv6 addresses at http://blogs.cisco.com/security/ipv6-addressing/
And the commonutiy has settled on calling the 16-bit numbers between the colons "hextets." In IPv4, each 8-bit portion between dotrs is called an "octet." The truly pedantic will object taht a hextet should be 6 dits, bit "hextet" is easier to say than "hexadecitet." :-)
Anotehr trivia point: The letters in an IPv6 address should awalys be lower case.
More arcana can be found at http://tools.ietf.org/html/draft-hartmann-6man-addresspartnaming-01, which is on track to become an RFC.

Similar Messages

Why do the connected devices to the router have the smae IPV6 address?

Hi,
Now I meet the issue
The operation steps on router (WRVS4400N):
1.Set the IP mode as Dual-stack IP and then save
2.Disable the IPV4 DHCP server
3.Use other deivces to connect the router.
The connected devices have the same IP address(2005:123:456:789::1),I am confused,why is it?
please help.
Thanks!

Hello,
The WRVS4400N is in fact assigning IPv6 addresses to all the devices connected to it, but the WRVS4400N does not show a table with the IPv6 addresses assigned to each device connected, it only shows the IPv4 addresses and the respective MAC address for each device. The IPv6 of the WRVS4400N is an aggregetable global unicast IPv6 address (See the image below)
If you go to Setup > LAN you will see that you cannot modify the prefix of the IPv6 address, all you can modify is the postifx and prefix length field (As you can see in the image below).
For more information about these fields and general IPv6 configuration, please refer to the article IPv6 Configuration on WRVS4400N Wireless-N Gigabit Security Routers
The only way you have to see the IPv6 address assigned to each device connected to the WRVS4400N is to check on each device the IPv6 address assigned. The WRVS4400N does not provide this information. You can see from the below picture the IPv6 address assigned to my computer. As you can see, the WRVS4400N assign the the computer the prefix 2002:c0a8::/6. Then you can see the actual IPv6 address which is 2002:c0a8:0:b182:e6a:9b0e:cdcf.
As you can see, the initial part (The prefix) remains the same, since these are the first 64 bits of the whole IPv6 address. The other 64 bits of the IPv6 address represents the interface ID, that is, the device that is connected to the WRVS4400N.
I hope you find this information helpful. If you have further questions, don't hesitate to ask.
Alejandro Moncada
SBCD Engineer
[email protected]

IPv6 address question

Good morning everyone,
I need to find this address:
fe80::404d:9415:115a:f39c
It looks like a link local address. But there is no ffee inserted between the 6th and 10th bits where the mac address would be inserted. Can I find the mac address from this IP address?
Thanks
Shane

If the address is being seen on a span port, your best bet might be snooping ICMPv6 neighbor solicitation packets with that address as the source. It's probably a windows-7 box somewhere; other vendors such as Apple or Linux tend to use the EUI-64 mappings on their link-local addresses.   In an Active Directory environment you can use group policy to discourage use of v6 privacy addresses by windows systems.
Depending on your DNS infrastructure, the dual-stack (presumably) box might be registering 6to4 or other AAAA records.   The 6to4 case is only likely if it's IPv4 address is public, rather than rfc-1918 private.
For SNMP, I shouldn't have said ports; you want the MIB that lets you query the neighbor discovery table of whatever is doing the vlan routing; be that a switch, firewall, or an actual router.
An example of a European university doing this sort of monitoring is described at:
http://www.terena.org/activities/campus-bp/pdf/gn3-na3-t4-cbpd132.pdf
FYI, if you have dual-stack devices on your network, I presume you are filtering for rogue RA devices and rogue DHCPv6 servers, e.g. on our client switchs we define:
ip access-list extended v4client
deny   udp any eq bootps any eq bootpc
deny   icmp any any redirect
permit ip any any
ipv6 access-list v6client
deny udp any eq 547 any eq 546
deny icmp any any router-advertisement
deny icmp any any redirect
permit ipv6 any any
and then on the client device interface switchports we filter:
ip access-group v4client in
ipv6 traffic-filter v6client in
This requires v6 allocations in the TCAM of course, e.g.
   sdm prefer dual-ipv4-and-ipv6 default
-- Jim Leinweber, WI State Lab of Hygiene

IPv6 Address in Internal Enterprise

Hello All,
I was looking at a Pilot deploment of IPv6 in our Labs.
I was little confused with rgards to what should I use as IPv6 address on Internal Network Infrastructure and hosts.
This is when I jumped across BRKRST-2301 where Shanon McFarland gives some idea on use of IPv6 in the internal.
So what it said is:
1. ULA Only -- Not recommended as NAT 66 solution does not exist <-- Can I use NPT Solution. But it would require same no. of GUA as well.
2. ULA + Global -- More problems with DNS, DHCP and SAS <-- Is this really that difficult ?
3. Global Only -- Recommended but security folks are not ready.     <-- I could even not convince some R&S folks for this!!! Even though I am convinced.
Apart from this, if i use a GUA which is not allocated to anyone internally & then NPT it while going outside.
I would like to know your thoughts and what would you recommend to do.
Maulik

Hi,
Reading many such things I think having GUA to end Hosts is best bet and that is what many people recommend to do.
I'm a bit confused since you say that all hosts will have 4 addresses but ULA must be used internally.
How will you dictate to every server and PC that they will only use their ULA addresses and ignore their global addresses for all internal communications? How will you monitor that this is actaully happening?
          <-- SAS should be used for this. Please refer this RFC and the problem statement it gives for SAS. But I am not sure every OS out there has implemented it correctly.
http://tools.ietf.org/html/rfc5220#page-12
You also state that all GUA addresses will be advertised to the Internet but these devices are not be reachable from the Internet. However you have just advertised these addresses to the Internet. I'm puzzled as to how you can achieve both conflicting requirements.
          <-- By this I actually meant that on all Infrastructure links and loopbacks of Routers we will use ULA, only end hosts will be given GUA and this GUA will be advertised into the routing protocol (exterior) for reachability. Both GUA and ULA in IGP. Advantage of this is that infrastructure network devices will not be reachable from Internet whatsoever.
I have had bad experiences with SP's in the past. Therefore I would not trust my IPv6 Security policy to them.
          <-- I agree, applying policies should be done at enterprise end must never trust SP.
For NAT 66, yes i am aware that it is still not available in major implementations, but some LB do that. So just was giving a thought.
http://tools.ietf.org/html/rfc6296
So I was just giving a thought:
1. To allocate ULA to Infrastructure Links and network devices.
2. Provide only GUA to end hosts. I too feel that should be the best approach.
Let me know on the 1st point. Thanks.

[svn:bz-trunk] 20976: bug fix BLZ 602 IPv6 address isn' t properly resolved when used in dynamic url in the proxy service

Revision: 20976
Revision: 20976
Author:   [email protected]
Date:     2011-03-28 09:20:34 -0700 (Mon, 28 Mar 2011)
Log Message:
bug fix BLZ 602 IPv6 address isn't properly resolved when used in dynamic url in the proxy service
checkintests pass
Modified Paths:
    blazeds/trunk/modules/core/src/flex/messaging/messages/HTTPMessage.java

Firstly, there's no such thing as Apache 9.3, there's Apache 1 (and subversions) and Apache 2 (and subversions). Your error message -
Oracle-HTTP-Server/1.3.28Shows you're using Apache 1.3.28
Secondly, I'm confused by your comment -
I do not have Apache 9.3 or higher but I think oracle should offer this in its companion CDOracle does offer the Apache server, if you're saying you didn't get it from Oracle then where did your Apache server come from?
Thirdly, I notice from your config file -
ErrorLog "|E:\oracle\product\10.1.0\Companion\Apache\Apache\bin\rotatelogs logs/error_log 43200"That you're piping the logs through rotatelogs, are you sure the logfiles haven't just been renamed?

HT4436 Is there a way to connect my iCloud acct. so that my regular email address is my user name instead of the .me email address? I don't even know how to access my very old .me address.

Anyone know if you can replace your .me email address for your regular email address? I'm trying to set up my iCloud acct. on my iPhone but the default email adddress is my .me email which I never used and do not know the password for. When I use the Forgot Password link, it sends to my .me email address
and I never used it and don't know how to access that address. Arg. Anyway to clean slate and permanently eliminate the .me thing?

I copied the iTunes file from the external drive and it's in both places. I thought all I would need is the iTunes program (which I downloaded to new computer) and my iTunes library file. There must be something else that's missing. My iTunes library looks the same on the new computer as it does when I open it on the external drive. If I click on an iTunes library song from my new computer, it will only play if I have the external drive plugged in.
My back-up drive is a mess. I have multiple copies of music, video, photo, and document files and I don't know how that happened. ={ Obviously, I don't know how to back up stuff properly and there are back-up files extending over a 6- to 8-year period. I think all I did was just drag and drop the main folders from the back-up drive to the same main folders on the C: drive. Also (and I'm kind of fuzzy on this) Windows used to automatically save music files in a folder within my document files (which makes no sense to me). As my Jewish friends would say, "Oy Vey!"

IPv6 Addressing Point to Point Links in the enterprise

For an enterprise, it doesn't seem to make sense to use Global addressing for point to point, transit-only links and loopbacks.
Link-local only addressing breaks debugging tools like traceroute, DNS, etc.
Is Unique Local the correct choice for this?
I've searched quite a bit and I've not found a lot of discussion about scope selection for point to point links. Some RFCs such as 6164 imply Global scope vs Unique Local scope usage is a preference. Most discussions of point to point addressing focus on bit length. I'm assuming this means design concerns are agnostic toward scope selection.
Is anyone aware of documentation I've missed or have any recommendations in this area?
If ULA was the correct choice, address hierarchy might look like this:
DataNetwork1 -- Router1 -- ULA.1.1 -- Link -- ULA1.2 -- Agg Router -- Core
DataNetwork2 -- Router2 -- ULA.2.1 -- Link -- ULA2.2 -- Agg Router /
DataNetwork3 -- Router3 -- ULA.3.1 -- Link -- ULA3.2 -- Agg Router /
The network core would have summarized entries for DataNetwork[1|2|3] and ULA[1|2|3]. IE, there would be a Global hierarchy and a ULA hierarchy.

Scott,
Let me break this down into some categories for you.
Address selection:
I believe that best practice is to use Global Unicast Addressing everywhere (coupled with a proper security policy at your edge). ULA was a compromise for Site Local never being properly defined and whilst it can be used in the same way as GUA I don't believe it is worth it. Irrespective of what you use (GUA or ULA), subject to your security and routing policy traceroute will work from both ends (e.g. you tracing out, someone tracing in)
Address masking:
The general rule of thumb is that you allocate /64s to eveything and then mask down to the appropriate mask for the function you are expecting (P.S. Forget everything you learnt about IPv4 address conservation). If you are using /127 masks then in theory every p2p link in your network is either a 0 (::) or a 1 (::1)
e.g.
traceroute HostB:
1     2001:1234:abcd:1::1
2     2001:1234:abcd:2::1
3     2001:1234:abcd:3::1
4     2001::4:10
The only exception to this is loopbacks, you can sequentially allocate /128s from the same /64 block
NOTE: /127 support is recent and may not be supported by some vendors, in this case use /126 masking (same as you would use /30s in IPv4)
If you have a /48 ( a normal enterise allocation) or larger then this should not be an issue ( you have access to 65536 x /64s) the only reason you would consider ULA for infrastructure numbering is because you have a small IPv6 pool. I would still argue you should get more IPv6 addresses than use ULA.
I hope this helps
Cheers

Connect to server using IPv6 address in afp URL

I'm not sure whether this is the correct forum for this question, but does anyone know whether I can specify an IPv6 address in the "Connect to Server" dialog?
I've setup IPv6 over direct-wired ethernet between my MBP and Mini. Using ping6, I can ping one from the other (but only when I specify -I en0)
I've tried the following URLs:
afp://[fe80::0216:cbff:dead:beef]
afp://[fe80::0216:cbff:dead:beef%en0]
I think the problem might be because I don't have an IPv6 router between the two hosts.
Thanks.
MacBook Pro 15 2.0GHz Mac OS X (10.4.8) mini 1.83GHz

I have the same problem and for me it extends to everything from SSH to HTTP. I think that mac has a bug in it networking. I can't get it to work on any mac I've tried. Can your mini connect to your laptop?
I've been googling for 3 days and can't find any solution.
MBP Mac OS X (10.4.9)

Can't get ipv6 address assigned correctly.

I use NetworkManager and dhclient for auto-configuration but it has some weird problems.
When I boot up my laptop, I only have chance to get access to ipv6 network, when I fail, I tried to delete the connection in Network Management Settings, and then added a new profile, disable and then enable the network again. Sometimes it works well, but sometimes it failed to auto-config.
If I use the command:
$ ip -6 rout
then I'll get the following message:
unreachable fe80::/64 dev lo proto kernel metric 256 error -101
fe80::/64 dev wlan0 proto kernel metric 256
default via fe80::2e0:2ff:fe54:59 dev wlan0 proto static metric 1
every time the default gateway is configured well, sometimes the address the address is missed , and if I do the following:
$ ping6 -I wlan0 -c 4 fe80::2e0:2ff:fe54:59
It responses normally.
PING fe80::2e0:2ff:fe54:59(fe80::2e0:2ff:fe54:59) from fe80::1034:56ff:fe78:9124 wlan0: 56 data bytes
64 bytes from fe80::2e0:2ff:fe54:59: icmp_seq=1 ttl=64 time=5.32 ms
64 bytes from fe80::2e0:2ff:fe54:59: icmp_seq=2 ttl=64 time=6.64 ms
64 bytes from fe80::2e0:2ff:fe54:59: icmp_seq=3 ttl=64 time=10.6 ms
64 bytes from fe80::2e0:2ff:fe54:59: icmp_seq=4 ttl=64 time=3.60 ms
--- fe80::2e0:2ff:fe54:59 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 3.603/6.546/10.617/2.587 ms
do the following:
$ ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:250:4400:d000::161/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::1034:56ff:fe78:9124/64 scope link
valid_lft forever preferred_lft forever
I found I just sometimes can get the ipv6 address start with 2001:
If the address is assigned, then:
$ ping6 ipv6.google.com
PING ipv6.google.com(ipv6.google.com) 56 data bytes
^C
--- ipv6.google.com ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10008ms
response nothing!
Then I switch into Windows 7, if something like above happened, then I managed to set the MAC address to a random value such as 12-34-56-78-91-23, soon, the problem will be corrected, I'll get a new ipv6 address assigned by DHCPv6 server. If I switch back to arch, set the MAC address in NetworkManager, it didn't have function at most time, and the ipv6 address even won't change!
Can anyone help me with this problem?
by the way, I never get ipv6 address when I use dhcpcd.

bernarcher wrote:
Hello and welcome to the forums heliumhgy.
Just in case you are wondering where your post has been gone: The moderators board received this message from you:
I dont need tunnel to access to ipv6, My univ use dual-stack to get both ipv4 and v6 work around all campus.
This is because you inadvertently used the "Report" link. But don't worry this happens rather often.
Just cause I caught the glimpse of re-blabla, and mistaken it as reply
Last edited by heliumhgy (2012-11-29 03:16:11)

How do I create a separate Address Book? I'm not asking about a mailing list but an address book where the addresses are not mixed in with my regular address b

How do I create a separate Address Book? I'm not asking about a mailing list but an address book where the addresses are not mixed in with my regular address book. I already have three address books created for me by Thunderbird. I add all new addresses to one of those but am afraid to delete the other address books because some of their addresses are not repeated in my "main" address book. So if I don't delete all the names in one of the existing books, I need to create an empty book that will not mix the addresses with those in another address book. HOW DO I CREATE A NEW, EMPTY ADDRESS BOOK? I want to be able to create various mailing LISTS using the addresses in this new book so I will eventually have a special address book with a variety of mailing lists I can use as I wish.

In 24.4.0 there is no File|New|Address Book. There is File|New|Address Book Contact. How do I create a new address book ?

Is it normal?(NetworkManager applet's strange output & 3 IPv6 address)

1) label ppp0 appears in NetworkManager applet every time when I up vpn-connection
2) Also something strange with enp5s0. Output of "ip addr":
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 10:bf:48:20:61:a4 brd ff:ff:ff:ff:ff:ff
inet 10.0.122.144/8 brd 10.255.255.255 scope global dynamic enp5s0
valid_lft 9283sec preferred_lft 9283sec
inet6 2002:5be2:8e63:b:12bf:48ff:fe20:61a4/64 scope global noprefixroute dynamic
valid_lft 2592003sec preferred_lft 604803sec
inet6 fec0::b:12bf:48ff:fe20:61a4/64 scope site noprefixroute dynamic
valid_lft 2592003sec preferred_lft 604803sec
inet6 fe80::12bf:48ff:fe20:61a4/64 scope link
valid_lft forever preferred_lft forever
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 00:08:ca:67:17:e9 brd ff:ff:ff:ff:ff:ff
9: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1400 qdisc pfifo_fast state UNKNOWN group default qlen 3
link/ppp
inet 91.226.141.81 peer 1.1.1.1/32 scope global ppp0
valid_lft forever preferred_lft forever
inet 91.226.141.81/32 brd 91.226.141.81 scope global ppp0
valid_lft forever preferred_lft forever
Is it normal that this interface has three IPv6 addresses?

Hi,
We are hitting the software bug and the bug ID is CSCsz56711
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsz56711
The issue is related to PCI componenet on the AP hardware and log that points to that is..
bsnInitRcbSlot: slot 0 has venus radio(UNSUPPORT)
The Replacement is the resolution and please contact your reseller or partner and if ur are the partner then RMA ids the resolution..
Lemme know if this answered ur question and please dont forget to rate the usefull posts!!
Regards
Surendra

I have a .mac email address, can i use this as a regular email address?

I have a .mac email address which i set up for ichat (ages ago) how can i use this as a regular email address in an email client? Is there SMTP/POP details?

With the introduction of iCloud, Apple has discontinued its "@mac.com" addresses support and has switched to Users using "@me.com" suffixes. To utilize this you will need to setup an iCloud account with a new Apple ID. And Apple discontinued iChat and has switched to Messages.app, using Apple ID's.
Hope this helps

Regarding the ipv6 address handling

Hi,
Are there any built-in functions in pl/sql for handling ipv6 addresses?
The functions similar to inet_ntop and inet_pton in c++ are available in pl/sql?

The closest I get to it is maybe dbms_network_acl_utility
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16760/d_networkacl_utl.htm#ARPLS67249
Subprogram Description
CONTAINS_HOST Function
Determines if the given host is equal to or contained in the given host, domain, or subnet
DOMAIN_LEVEL Function
Returns the domain level of the given host name, domain, or subnet
DOMAINS Function
For a given host, this function returns the domains whose ACL assigned is used to determine if a user has the privilege to access the given host or not.
EQUALS_HOST Function
Determines if the two given hosts, domains, or subnets are equal

How to verify if an IPV6 address entered in a textbox is valid ?

Hi,
How to verify if an IPV6 address entered in a text box is valid. I have a swing application. Until now we used only IPV4 address and we had a gui component with only four entries, which checked if the number entered is <= 255, so the user had to enter a correct address. Now with IPV6 there are IPV6 addresses, IPV4 mapped addresses, IPV6 zero compressed addresses and leading zeroes dropped kinds. We cannot supply a fix gui component.
So if I provide a textcomponent which accepts strings - how do i check if the ip addresses entered by the user is valid. Can I use INET6Address to do this ? is there a way ?
Thanks.

InetAddress.getByName(String host)
If it returns an Inet6Address without throwing an exception, I guess that would work.

IP phone not getting IPv6 address

Hi guys,
I am having trouble with receiving IPv6 address from my 2811 CME router that has been configured as a DHCPv6. Could you please help me what is wrong with my configuration below? Thank you.
Router#sh run
Building configuration...
Current configuration : 2327 bytes
! Last configuration change at 22:52:14 UTC Mon Feb 17 2014
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Router
boot-start-marker
boot-end-marker
no aaa new-model
dot11 syslog
ip source-route
no ip cef
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool VOICE
address prefix 2001::/64
vendor-specific 9
suboption 1 address 2001::1
suboption 2 ascii "IP-Phone"
multilink bundle-name authenticated
voice-card 0
crypto pki token default removal timeout 0
license udi pid CISCO2811 sn FHK1213F0HN
redundancy
interface FastEthernet0/0
bandwidth 50
no ip address
duplex auto
speed auto
interface FastEthernet0/0.10
encapsulation dot1Q 10
ipv6 address 2001::1/64
ipv6 enable
ipv6 nd other-config-flag
ipv6 dhcp server VOICE
interface FastEthernet0/1
bandwidth 50
no ip address
duplex auto
speed auto
ip forward-protocol nd
no ip http server
no ip http secure-server
tftp-server flash:SCCP41.9-3-1SR2-1S.loads
tftp-server flash:cnu41.9-3-1ES13.sbn
tftp-server flash:cvm41sccp.9-3-1ES13.sbn
tftp-server flash:dsp41.9-3-1ES13.sbn
tftp-server flash:jar41sccp.9-3-1ES13.sbn
tftp-server flash:term41.default.loads
tftp-server flash:apps41.9-3-1ES13.sbn
tftp-server flash:mk-sccp.jar alias English_United_States/mk-sccp.jar
tftp-server flash:g3-tones.xml alias United_States/g3-tones.xml
control-plane
mgcp profile default
telephony-service
protocol mode dual-stack preference ipv6
max-ephones 5
max-dn 5
ip source-address 2001::1
cnf-file location flash:
load 7941 SCCP41.9-3-1SR2-1S.loads
max-conferences 8 gain -6
transfer-system full-consult
create cnf-files version-stamp Jan 01 2002 00:00:00
ephone-dn 1
number 1000
ephone-dn 2
number 2000
ephone-dn 3
number 7000
ephone 1
device-security-mode none
mac-address 0017.9406.FD55
type 7941
button 1:1
ephone 2
device-security-mode none
mac-address 0016.46F5.F08E
button 1:2
ephone 3
device-security-mode none
mac-address 0017.941D.BE05
type 7941
button 1:3
line con 0
logging synchronous
line aux 0
line vty 0 4
login
transport input all
scheduler allocate 20000 1000
end

Duplicate posts.
Go here: https://supportforums.cisco.com/thread/2267863

6to4 Addresses vs Regular IPv6 Addresses - Confusion

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