R1(config-dhcp)#?
IPv6 DHCP configuration commands:
default Set a command to its defaults
dns-server DNS servers
domain-name Domain name to complete unqualified host names
exit Exit from DHCPv6 configuration mode
import Import options
information Information refresh option
nis NIS server options
nisp NISP server options
no Negate a command or set its defaults
prefix-delegation IPv6 prefix delegation
sip SIP server options
sntp SNTP server options
R1(config-dhcp)#prefix-delegation ?
X:X:X:X::X/ IPv6 x:x::y/
aaa Acquire prefix from AAA
pool IPv6 prefix pool
R1(config-dhcp)#prefix-delegation
i can see the command address prefix am using GNS3 7200 ios
Could be a stupid question though. How do the client devices get Default Gateway IP address in DHCPV6 configuration. I mean will it be always the link local ip address of that connecting interface of the Router to the LAN? I am bit confused âŚneed your helpâŚ
Iâve seen before that these commands are not supported in these versions. My examples are done on 1841 or 2811 routers with the latest 15.x version or on Cisco Virl.
Hi Rene,
With DHCP stateful Configuration, the client has got IPv6 2001:1111:1111:1111:255A:E159:32AF:5E42.
From where the client get the last 4 octet in the IP format?
i do not see FFFE so it does not EUI-64, How it get that?
Mahmoud,
What is the operating system of the client, and what is the clientâs MAC address? Some operating systems, Microsoft comes to mind, intentionally scramble the last few octets for the sake of privacy. The idea is that if the true EUI-64 standard is followed, then a clientâs activity can tracked as well as traced back to the originating computer. Microsoft will not use the clientâs MAC address for IPv6 addressing to safeguard privacy.
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shantel
(Shantel - Networklessons.com)
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One small configuration problem which I am facing in the IOU with ios 15.0 is as below, while trying to configure the stateful dhcp.
Router(config)#
Router(config)#ipv6 dhcp pool STF
Router(config-dhcp)#?
IPv6 DHCP configuration commands:
default Set a command to its defaults
dns-server DNS servers
domain-name Domain name to complete unqualified host names
exit Exit from DHCPv6 configuration mode
no Negate a command or set its defaults
prefix-delegation IPv6 prefix delegation
sip SIP Servers options
The option of configuring âaddress prefixâ after configuring âipv6 dhcp pool STFâ do not appear. Is this a problem with IOU or am I missing some other configurations, which may be done prior to this. I am facing similar problem while trying to configure some of the other features also. May you be able to help meâŚ
Others have had similar problems. It all depends on the version of IOS youâre using and the platform. Take a look at this post which includes some IOS versions and platforms on which it has been successfully implemented.
However, using your version it is possible to implement the same thing using the prefix-delegation command. If youâre interested, you can find out more information about that here.
I am following your steps to configure ipv6 Stateful. But, seem there is no command "R1(config-if)#ipv6 address dhcp " on my router. I used 7206 and 3725
Take a look at this Cisco Command Reference for the command. Take a look at the IOS versions that support this command and compare with your devicesâŚ
I am using ios ver 15.x Could you give me the correct command according through my ios ver ? Beside, please upgrade your steps to latest ios version though
After reviewing several features on the Cisco feature navigator, I come to the conclusion that several IOS versions and license levels (IPBASE, SECURITY, ADVANCED IP Services, Enterprise services etc) for different platforms do support the DHCPv6 feature and several do not. Because the 7206 is quite old, it may be a platform issue. As for the 3725 I was unable to find information about it in the feature navigator. In any case, I suggest you try to get access to an Advanced IP services IOS for your devices if possible. All IOS versions used in the lessons are up to date since this feature is avilable from the early 12.X versions.
Remember that SLAAC provides only IPv6 address, subnet mask and default gateway. It does not provide DNS server IP addresses. This is insufficient for connectivity to the Internet where domain names are used such as for web pages for example. Stateless address autoconfiguration (SLAAC) is useful in situations where you require a more automated network connectivity. For example, a TV can automatically configure itself, gain access to Internet services using preconfigured IPv6 addresses instead of domain names, and provide preset services to the user without the need to configure any network parameters. The same may be true for printers that have the ability to be connected to the cloud and be accessible to your devices via the Internet without the need for extensive IPv6 configurations.
The whole idea behind SLAAC is to eliminate the need for human intervention in configuring the parameters of IPv6 connectivity or for configuring a DHCP server to provide those parameters. DNS is really useful only for humans, as it is easier to remember words rather than numbers to access a specific network resource. But if devices configure themselves, DNS is suddenly not as important.