At 08:40 PM 1/5/01, Willy Schoots wrote:
>If this
>attempt to locate a DHCP server fails, the Windows 2000 DHCP client
>autoconfigures its stack with a selected IP address from the IANA-reserved
>class B network 169.254.0.0 with the subnet mask 255.255.0.09 . The DHCP
>client tests (using a gratuitous ARP) to make sure that the IP address that
>it has chosen is not already in use. If it is in use, it selects another IP
>address (it does this for up to 10 addresses). Once the DHCP client has
>selected an address that is verifiably not in use, it configures the
>interface with this address. It continues to check for a DHCP server in the
>background every 5 minutes. If a DHCP server is found, the autoconfiguration
>information is abandoned, and the configuration offered by the DHCP server
>is used instead.
Good answer, Willy. I think there is a typo in the subnet mask. I think you
meant 255.255.0.0.
I would just like to ask, why does this look so familiar and who said
AppleTalk was silly? &;-)
Microsoft stole this from AppleTalk. Ironically, Apple doesn't care and in
fact has been using the Automatic Private IP Addressing scheme for a few
years. I think Microsoft themselves only started using it pretty recently.
(Windows 2000, you say?)
When troubleshooting Macintoshes that can't get on the net, the first thing
I check for is a 169.254.x.x address which indicates the Mac couldn't find
the DHCP server (usually due to some silly Layer 1 problem &;-)
Now, we can start using this troubleshooting method with PCs also. Other
than for troubleshooting, I don't expect this private addressing scheme to
get too popular, though it's kind of cool and a great Apple invention! I
could see it being used in schools or small businesses that don't access
the Internet, but who doesn't access the Internet these days?
OK, enough rambling.
Priscilla
________________________
Priscilla Oppenheimer
http://www.priscilla.com
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
