Syntax For Cisco IOS IPv6 Server IP Client Reservation - Manual Binding

[Richard H. Shores]

Hello!

I am making the transition to IPv6. With the IPv4 DHCP server running on my 7206VXR router running the Advanced Enterprise Services

15.2(4)M3 IOS, I use the manual binding of IP addresses so that a client will get the proper address when I have to reimage client computers.

I can easilly setup a manual binding by using the MAC address for the client to get its reserved IP. I have been reading a lot of documentation on the Cisco IPv6 DHCP server, but for the life of me, I cannot locate any information on how to setup a manual IPv6 ip address binding for the Cisco IPv6 DHCP server. I am stumped. What is the syntax for the Cisco IPv6 server to accomplish this?

Many thanks,

Richard H. Shores

[Seb Rupik]

Hi Richard,

Reading through the documentation the server IPv6 address will be what ever has been assigned to the interface which the DHCPv6 pool is running on:

interface Ethernet0/0

 description downlink to clients

 ipv6 address FEC0:240:104:2001::139/64

 ipv6 dhcp server dhcp-pool

!

...so in the above example from the documentation the site-local address FEC0:240:104:2001::139/64 .

cheers,

Seb.

[Richard H. Shores]

Thanks Seb for the information but what I was looking for was a static binding of a client's IP, like that in IPv4 DHCP.

Best regards

[Harold Ritter · Accepted solution]

Hi Richard,

The last time I checked, this feature was still not supported.

Regards

[Richard H. Shores]

Thanks Harold for the information. That would explain why it is not  in any documentation. That is a show stopper when you have lots of  computers that need a static IP for imaging. Perhaps that will be an  added feature fairly soon.

Best regards

[Peter Koltl]

There are theoretical obstacles too. DHCPv6 is different from DHCPv4. The lease can be provided based on the DUID and IAID and not the MAC address. The DUID varies time-dependently on the client by default.