Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.
DHCP Autoconfiguration / Automatic Private IP Addressing (APIPA)
(Page 3 of 3)
Bear in mind that APIPA is not a
proper replacement for full DHCP. The 169.254.0.0/16 block is a private
IP range and comes with all the
limitations of private IP addresses, including
inability to use these addresses on the Internet. Also, APIPA cannot
provide the other configuration parameters that a client may need to
get from a DHCP server. Finally, APIPA will not work properly in conjunction
with proxy ARP,
because the proxy will respond for any of the private addresses, so
they will all appear to be used.
Since it uses ARP to check for address
conflicts, APIPA is not well-suited for large internetworks. To use
it on an internetwork with multiple subnets, you would require software
that allows each subnet to use a different portion of the full 169.254.0.0/16
blocks, to avoid conflicts. In practice, APIPA is a solution for small
networks; large internetworks deal with the problem of not being able
to contact a DHCP server by making sure that a client can always contact
a DHCP server. J
Key Concept: An optional DHCP feature called Automatic Private IP Addressing (APIPA) was developed to allow clients to still be able to communicate in the event that they are unable to obtain an IP address from a DHCP server. When enabled, the client chooses a random address from a special reserved block of private IP addresses, and checks to make sure the address is not already in use by another device. It continues to check for a DHCP server periodically until it is able to find one.
|If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!|
Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.