Dear Lee,
Actually i am trying to make a simulation of the MIPL network and in my
scenario, instead of manually providing global scope IP address to the routers,
i am only providing prefixes.
So i was wondering if it is legal for the routers to statelessly auto-configure
their addresses from the prefixes that has been manually provided.
I am not using any stateful approach for any configuration. Its only about
stateless auto-configuration i am concerned with.
Zarrar
Date: Thu, 5 Jul 2007 15:08:51 +0900From: [EMAIL PROTECTED]: [EMAIL PROTECTED]:
Re: [mipl] Autocnfiguration for Routers in IPv6CC: [email protected]
Dear colleague.
I am a bit confused. You say that "In my case, lets suppose i manually provide
the router's interfaces with only 64 bit prefixes and not complete global
scope 128 bit addresses." Is it mean that you set the prefix information on
radvd.conf ? If not, how do you only set the prefix information into a router?
As I know, a router has 2 addresses in IPv6 networks such as link-local address
and global address. The global address can be made by manual mode or
auto-configuration mode (statless or statful). In this point, the global
address has to be a perfect form to communication other node over other
subnets.
So, I am a bit confused. How do you set only the prefix information on the
router in manual mode? Take a look the network configuration file on Linux box
(i.e., /etc/network/interface). The file looks like as below:
[EMAIL PROTECTED]:/etc/network# cat interfacesauto loiface lo inet loopback
auto eth0iface eth0 inet staticaddress 10.22.11.52netmask 255.255.255.0
auto eth1iface eth1 inet staticaddress 192.168.0.1netmask 255.255.255.0
iface eth1 inet6 staticaddress 2001:0220:1404::1netmask 64
auto eth2iface eth2 inet staticaddress 192.168.1.1netmask 255.255.255.0
iface eth2 inet6 staticaddress 2001:0220:1404:1::1# address
2001:0220:1404:1::/128netmask [EMAIL PROTECTED]:/etc/network#
So, when you use the manual mode to config the address information on the
router, you have to provide whole address information. The only prefix
information to set could be used for auto-configuration.
I hope it is useful to you. Cheers.
On 7/5/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Dear Lee,Thanks for your reply but can you please clarify or elaborate more the
last sentence "Also, even though you only set a prefix information into a
router in the network, the router will make a global address if there is
another router sending router advertisement message." You are right that i am
talkign about stateless autoconfiguration which the router also uses to form
Link-local address, but my question is regarding the global scope address of
the router. The specs say that routers are assigned addresses (except
link-local) either manually or by an external means. In my case, lets suppose i
manually provide the router's interfaces with only 64 bit prefixes and not
complete global scope 128 bit addresses. Then in that case would it be legal
for the router to statelessly auto-configure its 128 bit global scope address
by combining the manually provided prefixes with the MAC48 interface identifier
as specified in RFC 2462? Zarrar________________________________> Date: Thu, 5
Jul 2007 01:11:11 +0900> From: [EMAIL PROTECTED]> To: [EMAIL PROTECTED]>
Subject: Re: [mipl] Autocnfiguration for Routers in IPv6> CC:
[email protected]>> Dear colleague.> The address configuration methods in
IPv6 are normally divided into two. One is a stateless auto-configuration (RFC
2462) and other thing is a stateful auto-configuration (RFC 3315). Well,
actually, the stateless auto-configuration is done by router advertisement
message sent from a router and the statefult auto-configuration is done by
DHCPv6 server that nodes obtain the address configuration information with DHCP
procedures. > Your question must be about the stateless auto-configuration. A
router in the network would have its IPv6 address (network prefix + other) and
then the router periodically sends router advertisement message to all node in
the network. The router advertisement message includes the prefix information
and the address configuration information. In the case that the router only has
a link-local adress, the router advertisement message would be wrong because
the link-local address cannot be sent as the prefix information in the router
advertisement message. > Also, even though you only set a prefix information
into a router in the network, the router will make a global address if there is
another router sending router advertisement message.> Cheers.> On 7/4/07,
[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:> Dear all,> Thankyou for detailed
replies regarding my previous question about the need to perform DAD. > Another
question is regarding the auto-configuration of Routers in an IPv6 network.>
>From RFC 2462 and also i read somewhere that "With the exception of link-local
addresses, address auto-configuration is only specified for HOSTS (and by
implication not for routers). Routers must obtain address configuration
parameters through another means (for example, manual configuration)". >
Because every router interface (except loopback ofcourse) should have a
global-scope IPv6 address which the MN will use as destination address in BU
during Home registration process in MIPv6, so if I manually provide ONLY
prefixes to an IPv6 router, then can't the router perform auto-configuration to
form a global-scope address from this manually assigned prefix(es)? >
Clarification would be appreciated.> Zarrar>
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