There has been some water that passed under that bridge. They not only come
from MAC addresses, but from random number generators and cryptographic
algorithms - and can simply be numbers assigned by administrators.
In addition to
2464 Transmission of IPv6 Packets over Ethernet Networks. M. Crawford.
December 1998. (Format: TXT=12725 bytes) (Obsoletes RFC1972) (Status:
PROPOSED STANDARD)
take a look at
http://www.ietf.org/rfc/rfc3315.txt
3315 Dynamic Host Configuration Protocol for IPv6 (DHCPv6). R. Droms,
Ed., J. Bound, B. Volz, T. Lemon, C. Perkins, M. Carney. July 2003.
(Format: TXT=231402 bytes) (Updated by RFC4361, RFC5494) (Status:
PROPOSED STANDARD)
http://www.ietf.org/rfc/rfc3972.txt
3972 Cryptographically Generated Addresses (CGA). T. Aura. March 2005.
(Format: TXT=51473 bytes) (Updated by RFC4581, RFC4982) (Status:
PROPOSED STANDARD)
http://www.ietf.org/rfc/rfc4291.txt
4291 IP Version 6 Addressing Architecture. R. Hinden, S. Deering.
February 2006. (Format: TXT=52897 bytes) (Obsoletes RFC3513) (Status:
DRAFT STANDARD)
http://www.ietf.org/rfc/rfc4862.txt
4862 IPv6 Stateless Address Autoconfiguration. S. Thomson, T. Narten,
T. Jinmei. September 2007. (Format: TXT=72482 bytes) (Obsoletes
RFC2462) (Status: DRAFT STANDARD)
http://www.ietf.org/rfc/rfc4941.txt
4941 Privacy Extensions for Stateless Address Autoconfiguration in
IPv6. T. Narten, R. Draves, S. Krishnan. September 2007. (Format:
TXT=56699 bytes) (Obsoletes RFC3041) (Status: DRAFT STANDARD)
On Apr 14, 2010, at 10:55 PM, Parav Pandit wrote:
> Hi,
>
> As per RFC 2464, Link local address for Ethernet based interfaces are based
> on the EUI-64 (derived from the MAC address).
>
> I have #3 questions based on this.
>
> In this case,
> when one Ethernet based host(from its link-local source) tries to ping the
> other Ethernet based host, it knows the Mac address implicitly (from the Link
> local address).
>
> 1. Why is it required to explicitly do the Neighbor discovery for the
> link-local addresses?
> RFC 4861 says to do the neighbor discovery even for link-local addresses.
> Correct me if my understanding is incorrect.
>
> 2. Does it mean that in Ethernet networks, interface can have only one
> Link-local address? If not then we violate the RFC 2464.
>
> 3. Does RFC 4941 Privacy extension for autoconf apply to Ethernet interfaces?
>
> Regards,
> Parav Pandit
>
>
>
>
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