Comcast IPv6 DHCP-PD Implementation

Recently, Comcast enabled IPv6 for my internet connection. My Router picks up the prefix perfectly and is giving out addresses from ::100 to ::177. What I would like to do is implement DHCPv6 on my domain controller, assign static addresses to my DC and
Exchange Server, and use the DNS Server on my DC for registration and requests. I also am aware that certain features require IPv6 to be enaled. To date I have had no success in getting this to work and am looking for pointers and advice so I can fully use
IPv6 here in my environment. The Prefix starts with 2601 so I think these are available from the internet but am not sure. The router also gets a 2001 address which I know is globally available.
Please advise
Bob Hessenauer

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WAP4410N IPv6 DHCP or AutoConfig

I would like to see IPv6 DHCP support on the WAP4410N or at least IPv6 AutoConfig.
Currently, you have to put in a static IPv6 IP for the WAP.
I would like to see IPv6 DHCP support as well as IPv6 AutoConfig.
It would be nice to allow wireless clients to use IPv6 on my network, like my wired clients can (AutoConfig).
Just a suggestion.

It's really rather ridiculous DHCPv6 isn't implemented in OS X yet. I can (possibly) understand this for 10.4 and 10.5 but 10.6 is going to run into IPv6 deployment scenario's and should be able to handle all cases. I hope to God 10.7 has decent v6 support throughout OS X.
As far as I know, the dhcp-client used by OS X is the KAME project client, now known as WIDE-DHCP which does have support for DHCPv6 and has so for a long time. Why Apple is so reluctant to include this feature in both iOS and OS X is quite the mystery.

IPv6 dhcp

I am testing IPv6 DHCP server in test lab with 3750 switch.
Following is the details of the setup.
Windows server 2008 r2 is configured as DHCP server.
3750 switch with ios 12.2(55)SE5 is used to connect DHCP server and client.
DHCP server and client both are in same VLAN 1.
Clients are getting IP address from DHCP server if I configure 3750 switch as layer 2 switch.
If I configure 3750 switch as a L3 switch clients are not getting IP address from DHCP server, clients are getting auto configured IPv6 address.
Need assistance for the same

Hi Yusuf,
You need to do a configure a few things on the router interface for DHCPv6 to be used instead of SLAAC.
interface vlan10
ipv6 address 2001:DB8:12FF:1::1/64
ipv6 nd prefix 2001:DB8:12FF:1::/64 no-advertise <++++++ will prevent SLAAC from taking place
ipv6 nd managed-config-flag <+++++ tells the workstation it should get its IPv6 address from DHCP
ipv6 nd other-config-flag <++++++ tells the workstation to get other config (dns server, domain name, etc) from DHCP
Regards

RV320 Question about IPv6 DHCP

Hello everyone,
Been running the RV320 for quite some time but now I also want to use IPv6 support for all clients and to the net. On WAN1 I have a fiber connection to my ISP who gave me a bunch of IPv6 adresses and IPv4 (IPv4 already being configured and working!).
Now all clients for IPv4 locally use 192.168.1.x and ofc i have set some external IPv4 adresses to internal IPv4 adresses by using One-to-One NAT.
I want to setup IPv6 DHCP on our network aswell and went to DHCP setup > IPv6 and then clicked DHCP SERVER.
I filled in these fields:
IPv6 adress: fc00::1
Prefix length: 7
DHCP Server and for DNS the google's:
2001:4860:4860::8888
Should that be it? Or do i also need to configure the IPv6 Address Pool Table stuff? And if so, how?
I basically want the same as IPv4, so just internal IPv6 adresses which should translate to the outside just like with IPv4.
Also under WAN1 i have WAN Connection Settings:
What shouldb e filled in under: LAN IPv6 Address: ?? i have :: right now there.
Can anyone help me?

Hello Michiel,
The following link has some useful information about setting up DHCPv6 server on RV320.
http://sbkb.cisco.com/CiscoSB/ukp.aspx?vw=1&docid=5d6de1bfe4c1488fb51b75cb76dd0ef6_DHCPv6_Configuration_and_Monitoring_on_RV320_Router.xml&pid=2&respid=0&snid=9&dispid=0&cpage=search
Also, the admin guide (Chapter 3, Page 19) provides some good information about IPv6 support on the RV320, especially around DHCP-PD. If the Service provider supports DHCP-PD (prefix delegation), then you can just enable the feature on RV320 and the clients behind the router (including LAN interface on the router) get IP address directly through the ISP.
Hope this helps.
Regards,
Nagaraja

How to configure IPv6 DHCP on Windows Server 2012?

I see LOTS of help and what to do for IPv4, but it's a ghost town for IPv6 DHCP configuration? Hardly anything on youtube etc that shows this simply. Lots of complicated unrelated IPv6 stuff though.
Seems many here as best practice set up server to handle DHCP. Not router or firewall. So how are you setting up IPv6 on the server?
Anyone have any tutorials or simple step by step help how to properly configure DHCPv6 on server?
Currently the router is handling DHCP. I want to use Active Directory. I know its best to have server handle DHCP, but will AD work just fine with router doing both ipv4 and ipv6 dhcp and for simplicity and wireless? Small 5 user office.
Thank you.
This topic first appeared in the Spiceworks Community

I see LOTS of help and what to do for IPv4, but it's a ghost town for IPv6 DHCP configuration? Hardly anything on youtube etc that shows this simply. Lots of complicated unrelated IPv6 stuff though.
Seems many here as best practice set up server to handle DHCP. Not router or firewall. So how are you setting up IPv6 on the server?
Anyone have any tutorials or simple step by step help how to properly configure DHCPv6 on server?
Currently the router is handling DHCP. I want to use Active Directory. I know its best to have server handle DHCP, but will AD work just fine with router doing both ipv4 and ipv6 dhcp and for simplicity and wireless? Small 5 user office.
Thank you.
This topic first appeared in the Spiceworks Community

IPV6 DHCP : Active Clients always zero 0

Hello All,
I have configure IPV6 DHCP by using below mentioned configuration, all my LAN PCs are getting IPV6 correctly and internet is also running well.
But if run this command on Router, so it shows Active Clients are always zero 0.
R1# sh ipv6 dhcp pool
DHCPv6 pool: DHCP_POOL
DNS server: 2001:470:ab::cd
Domain name: abc.com
Active clients: 0
R1# sh ipv6 dhcp binding --> also show empty result.
Can anyone please tell me the reason .
MY CONFIGURATION:
ipv6 unicast-routing
ipv6 dhcp pool DHCP_POOL
dns-server 2001:470:ab::cd
domain-name abc.com
interface FastEthernet0/0
no ip address
speed 100
full-duplex
ipv6 address 2400:FC00:ab::/64 eui-64
ipv6 nd prefix 2400:FC00:ab::/64
ipv6 nd other-config-flag
ipv6 dhcp server DHCP_POOL
ipv6 route ::/0 2400:FC00:ab::1
int fa0/0 is directly connected to my LAN Switch.
Regards,

Ok , the problem solved by changing the configuration in this way. Now it is showing Active clients and Bindings.
I will try your method too, to just add ipv6 nd managed-config-flag in my previous config.
But i am still confused which configuratrion is better and which technique to use ??
My previous config was stateless , is my new config is stateful ??
My NEW Configuration:
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool DHCP_POOL
address prefix 2400:FC00:ab::/64 lifetime infinite infinite
link-address 2400:FC00:ab::2/64
dns-server 2001:470:ab::cd
domain-name abc.com
interface FastEthernet1/0
no ip address
duplex full
speed 100
ipv6 address 2400:FC00:ab::2/64
ipv6 enable
ipv6 nd managed-config-flag
ipv6 dhcp server DHCP_POOL
ipv6 route ::/0 2400:FC00:ab::1

Ipv6 dhcp inside AToM

Hello everyone.
I was experimenting with ipv6 dhcp using the following topology:
7609s ----------mpls core-------- 7609s -------SWITCH---------client PC
\________vpws_________/
Idea of this experiment is that on a first router I have configured ipv6 dhcp server for vrf CLIENT. dhcp server was enabled on a SVI inside vrf, which also serves as AC for vpws. So I was trying to emulate L2 connectivity between a client and a server. VPWS works, L2 connectivity exists, static dual stack was successfully tested. But a strange behavior is observed with ipv6 dhcp design both for managed and other flags. Specifically RA messages are lost. In a router debug RA are sent to FF02::1 address but never reach a client (wireshark). Although other dhcp parameters like domain name, dns servers or ipv6 address (managed flag) are received without a problem. Client doesn't see a router.
So are the messages sent to FF02::1 address transparently passed through vpws?

Hi Yusuf,
You need to do a configure a few things on the router interface for DHCPv6 to be used instead of SLAAC.
interface vlan10
ipv6 address 2001:DB8:12FF:1::1/64
ipv6 nd prefix 2001:DB8:12FF:1::/64 no-advertise <++++++ will prevent SLAAC from taking place
ipv6 nd managed-config-flag <+++++ tells the workstation it should get its IPv6 address from DHCP
ipv6 nd other-config-flag <++++++ tells the workstation to get other config (dns server, domain name, etc) from DHCP
Regards

Support for IPv6 DHCP or RDDNS

Hi,
I'm deploying IPv6 on our company and found out there is not possible way to automatically get DNS servers for IPv6 for mac computers, since it doesn't support dhcpv6 or the extensions for RA in stateless configuration mode.
Any word on when are this features going to be available?

It's really rather ridiculous DHCPv6 isn't implemented in OS X yet. I can (possibly) understand this for 10.4 and 10.5 but 10.6 is going to run into IPv6 deployment scenario's and should be able to handle all cases. I hope to God 10.7 has decent v6 support throughout OS X.
As far as I know, the dhcp-client used by OS X is the KAME project client, now known as WIDE-DHCP which does have support for DHCPv6 and has so for a long time. Why Apple is so reluctant to include this feature in both iOS and OS X is quite the mystery.

[SOLVED] Comcast IPv6 Prefix Delegation

I've built a gateway/firewall/network services box out of an old machine I had, and it works quite well for IPv4. I was super excited when Comcast finally rolled out IPv6 in my area, and have been attempting to get it to work, however with no success. I have at one point successfully been using an HE tunnel to provide IPv6 for the network. My goal is to have this box running Arch get a prefix from Comcast, distribute it to the local network via radvd, and route IPv6 traffic between the LAN and Comcast without manual intervention to assign the prefix anywhere.
My issue seems to be getting ISC's dhcpcd to apply the prefix that it receives from Comcast to the LAN interface. The prefix I receive is a /64, and if I run dhcpcd in verbose mode, I do see it receive a prefix assignment.
LAN: enp2s2
WAN: enp2s8
dhcpcd.conf
#Prefix delegation in theory
noipv6rs
interface enp2s8
ia_pd 1 enp2s2
radvd.conf
interface enp2s2 {
AdvSendAdvert on;
MinRtrAdvInterval 3;
MaxRtrAdvInterval 10;
prefix ::/64 {
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr on;
DeprecatePrefix on;
However, the prefix never shows up on any interface (using ip addr to view), so never seems to be usable. Just in case I wasn't checking it appropriately, I attempted to run radvd anyways, and it exits with an error about no prefixes to advertise as expected.
Furthermore, I've been having further issues, in that if I manually take the prefix, and give my router's LAN interface the prefix::1 address, I have no IPv6 connectivity. If I switch dhcpcd to use ia_na instead of pd, I get an address on the WAN interface and have fully functional IPv6 connectivity on the router, as expected. I was hoping that I could use both statements to get an address on the WAN and delegate a prefix to the LAN, but that seems to be disallowed by dhcpcd, probably for a good reason I'm not aware of. I was hoping neighbor discovery would inform my router of Comcast's router on the link-local link (is that the right term?), but it does not seem to be functioning.
I've googled extensively and have not been able to find a solution that does not require manual intervention to copy-paste the prefix from the dhcpcd/dhclient output either into radvd, or assigning the address manually. Any suggestions on where I should look, or what I should try?
Thanks in advance
Last edited by phate408 (2013-09-19 18:27:01)

phate408 wrote:I manually take the prefix, and give my router's LAN interface the prefix::1 address, I have no IPv6 connectivity.
If Comcast are anything like Internode here in Australia, they require the PD request to update their routers with the correct routing information.
AFAIK, you should be doing a IA_NA to get an address for your router (to connect the link between your router and Comcast), then you need to do the PD to get the addresses for your internal use which radvd will then advertise.
EDIT: I figured I should include some info for how I do it. I use dibbler-client with these options (obviously I've censored my PD):
inactive-mode
skip-confirm
log-mode short
log-level 7
iface "ppp200" {
pd {
prefix 2001:aa:aa:ab00::/56
option dns-server
IPv6 addresses are then statically assigned to the internal interfaces, and radvd runs with this config:
interface eth1 {
AdvSendAdvert on;
MinRtrAdvInterval 30;
MaxRtrAdvInterval 100;
AdvDefaultLifetime 3600; # 1 hour
AdvDefaultPreference high; # this is the best router
AdvHomeAgentFlag off; # Disable Mobile IPv6 support
prefix 2001:aa:aa:ab01::/64 {
AdvOnLink on;
AdvAutonomous on;
RDNSS 2001:aa:aa:ab01::f1 {
Note the increment in the last byte of the network prefix:
:ab00: (ISP side of the router) => :ab01: (LAN side)

IPV6 DHCP stateful doesn't insert local subnet in route table

I am setting up IPV6 on a LAN using satic IPs for Win2008 servers and DHCP stateful mode for Win7 clients. All static assigned servers can ping each other and if I setup a static on the Win7 clients they can also ping the servers. However when I assign DHCP stateful mode IP to the clients they lose the ability to ping the servers. I think that was is going on is that when the Win7 machines get IP via DHCP they do not get a route in the routing table for the local subnet. I have included IP info for static and DHCP clients in attachments.
I figure if I could add the fd:0:0:1::/64 subnet to the DHCP client it would work but I haven't been able to find the correct syntax to add an "on-link" router. Furthermore, this would kind of defeat the purpose of DHCP if I had to manually add routes to clients.
I have a UC520 that is the default gateway on the LAN and seems to support IPV6. Maybe this guy can help me out?
Thanks in advance.

Alain,
I disagree about the /128. If you look at the static host it also has a /128 route pointing to itself. Also the IPV4 also shows /32 routes pointing to the local IP. The static host has one additional route not found on the DHCP client which is the /64 route to the local subnet pointing to "on-link". It is not clear how to add an "on-link" route using netsh but my point is that DHCP should provide all info and relying on manually adding routes is not the optimal solution.
The UC520 does not have any IPV6 on it. I only mentioned it because usually I use Windows for DHCP but in this case Windows is giving me this weird behaviour. I would rather get Windows DHCP to solve the problem but if it can't I would use the UC520 as a backup option.
Thanks for your input.
Rgds,
Diego

DHCP Server Implementation

Hi All,
We have planned to implement the DHCP Server therefore here I am looking for the best practice which we can do. we have almost 25 branches across the country and its under in one cloud and single
domain.
Is this better to keep a DHCP server in Head Quarters only or need to keep in each region. (Like central, eastern and western region)
If we install DHCP server in each region, can we configure same scope in all DHCP server or need to configure the scope based on region.
If we configure the same scope in all the DHCP server, is there any chance for IP conflict.
Thanks,
Faisal

In my opinion you have not mentioned the most important thing to be considered. How are the branches connected? How is Active Directory configured? Are you using AD sites?
Do you have at least one server at each branch? Do you have a DC in each branch or only one in each region?
I would think that how this is all configured would be the basis on which your DHCP strategy was based.
Bill

DHCPv6 Server. v6 IP only. Do I need IPv6 DHCP in case setting address manually. PROBLEMS

I want network without Ipv4, only IPv6. Ipv4 is disabled on server and client. After setting IPv6 address manually to 2000:1::1/64 I still have dhcp enabled on interface. And when installing roles (dhcp, dns server) on server it gives message that
no static addresses is available. Moreover after setting dhcp server scope 2000:1:: it serves addresses to dhcp server.
How set correct static IPv6?
After publish route:
netsh int ipv6 set interface Local adv=en man=en other=en
netsh int ipv6 add route 2000:1::/64 Ethernet publish=yes
I have two ipv6 addresses on client? Highlighted address stays as static after releasing adapter and it looks like I do not need dhcp server at all??
Ethernet adapter Ethernet:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter
   Physical Address. . . . . . . . . : 00-15-5D-01-02-06
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2000:1::35ac:d8ae:dac6:5b69(Preferred)
   Lease Obtained. . . . . . . . . . : 22 dec 2013 11:28:33
   Lease Expires . . . . . . . . . . : 22 dec 2013 11:39:48
   IPv6 Address. . . . . . . . . . . : 2000:1::b542:48c6:ac2a:4a18(Preferred)
   Link-local IPv6 Address . . . . . : fe80::b542:48c6:ac2a:4a18%12(Preferred)
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 301995357
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-48-61-B0-00-15-5D-01-02-06
   DNS Servers . . . . . . . . . . . : 2000:1::1
   NetBIOS over Tcpip. . . . . . . . : Disabled

Hi,
I got something similar with you.
Since I don’t have a DHCP server in my environment, I just specified a static IP for test. And when I ran netsh interface ipv6 set address “Local Area Connection”,
the IP didn’t modified as expected. It just ignored the old entry and added a new one.
It is worth mentioning, there is no problem with IPv4.
As a workaround, you can manually disable DHCP for the clients.

2012 R2 DA, and clients using Comcast IPv6

I have not had the chance to troubleshoot this issue but I strongly suspect that clients using Comcast which is now giving out routing working ipv6 addresses are failing to connect because of it. Has anyone else experienced the same?

Hi
I 've seen this article too, but there are otherones which tell the
opposite - like this one here:
Windows 7 null encryption - yes we can
So I'm not sure what's realy matters
Best regards - Bueschu
Bueschu
But if you read further into the article Jason Jones states. "Hmmm, ok - it appears I was wrong and the IP-HTTPS enhancements are
not applicable to Win7 clients."
Teredo is still the best technology for Windows 7 Clients. if you can install you DA service in Edge mode then the Win 7 clients will benefit.
Regards, Rmknight

Anybody Got Experience Getting ASA to Work With Comcast IPv6?

I'd like to enable dual stack IP with my ISP, Comcast. Unfortunately, Comcast requires residential CPE equipment to support DHCPv6-PD, which the ASA doesn't do. On Comcast forums, others have posted that the workaround is to place a router supporting DHCPv6 between the cable modem and the ASA.
My question is, given that scenario, I assume the ASA can get the information it needs to configure its outside interface from the router's RA messages? I'm a newbie when it comes to IPv6, so I'd appreciate any help or pointers to information on setting up my ASA correctly for IPv6 behind a router.
Thanks very much!
Sent from Cisco Technical Support iPad App

#1 What is the brand and model of the router?
#2 What software firewall is on your computer?
#3 What is your OS and version?
If you are the original poster (OP) and your issue is solved, please remember to click the "Solution?" button so that others can more easily find it. If anyone has been helpful to you, please show your appreciation by clicking the "Kudos" button.

IPv6 DHCP [SOLVED]

I've been running an IPv6 "Static" network for some time now without any troubles and all seems to be working quite well however now I'm looking to create a DHCPv6 network while using netcfg. Initial testing works, I am receiving a IPv6 address as expected. But what I cannot figure out is how can I make sure a specific interface "eth0" receives a certain IPv6 IP Address. On my Windows machine I found my Client ID and was able to set the host-identifier option dhcp6.client-id and I receive the IP I desired to use. However on my testing server which runs the latest build of Archlinux I cannot seem to make the server receive the IP I want.
I've tried both dhcpcd and dhclient but so far no luck. I always receive an IP, just not the one I want as defined by the DHCPv6 server.
Any help would be great! I'm open to any suggestions to try out and can supply any amount of details you may want to know as well.
Thank you!
Last edited by diemuzi (2012-04-16 13:28:45)

diemuzi wrote:I'm not exactly certain when IPv6 was finally able to use the hardware ethernet but I can tell you I am using version 4.2.3.2-2 (latest at the time of writing this) and it's working out great! I found the information in a random post online someplace and noticed someone else was using it with an IPv6 address and just decided to give it a try and sure enough it worked.
Thanks, I'll have to look into it more.... I might have to move my DHCP servers over to an Arch box instead of on my CentOS gateways....
diemuzi wrote:The latest version actually comes with two rc.d scripts called dhcp4 and dhcp6. So all I did was create two DHCP scripts named dhcpd.conf.ipv4 and dhcpd.conf.ipv6 and then edited the dhcp4 and dhcp6 scripts to look for those config files
I'm running a pair of CentOS 6 boxes as an Active/Backup pair; CentOS comes with that setup already (well, different file names, but same concept) which is what I'm using. It works, but it makes me feel dirty.
diemuzi wrote:I hope someday they'll combine them but for now this works out great.
It would be lovely to be able to define hosts in a single place....
host svr-app-tux1 { hardware ethernet 00:12:79:3A:96:A5; fixed-address 172.16.0.140; fixed-address6 2001:44B8:xxxx:xxxx:172:16:0:140; }
Last edited by fukawi2 (2012-04-17 00:04:54)

Comcast IPv6 DHCP-PD Implementation

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