Re: [wdvltalk] certain sites slow?

[[EMAIL PROTECTED]]

Actually it's not that complicated, although DNS settings have nothing to do 
with DHCP. Dynamic Host Configuration Protocol (DHCP) is used when you do 
not have a fixed IP address. IOW, your IP address (that with which other 
computers communicate with you) is assigned at logon by a computer 
designated as a DHCP server. This server has a pool of available addresses 
for the domain to which your computer is connected. At logon, if you are set 
up for DHCP, your system broadcasts a request for an address. The DHCP 
server responds and there is a "negotiation" which results in an address 
from the pool being "leased" to your system, for that session. In a 
subsequent session, you may have an entirely different address from within 
the pool. This is the "dynamic" portion of the protocol name, as the 
assignment occurs on the fly, and as needed.

This is the method used by almost all ISPs, as otherwise they would have to 
have available a block of addresses equal to the number of subscribers at 
all times, even though the likelihood of 100% subscriber saturation is very 
low. Using this method, they can maintain a smaller pool of addresses and 
still meet the demand needs of their subscriber base. Doing otherwise is 
more expensive. For example, my ISP (an ADSL provider) offers fixed-address 
subscriptions, at more than twice the price of a normal DHCP-based 
subscription, for those who have an actual need and are willing to pay the 
price. A colleague of mine here at IBM has such a subscription, since the 
nature of his position here requires that he be able to establish a VPN 
connection from home with the internal IBM network, which is only permitted 
from a fixed address.

DNS is the Domain Name Server system which was set up early on to make it 
easier for us humans to get around on the net. Computers could care less 
about the names we give to our sites; they only use the four-byte numeric IP 
address anyway. What the DNS servers do is basically provide a vast system 
of lookup tables, so that when someone requests www.google.com the server 
responds with 216.239.39.104, which is what is actually used to access their 
site (Try it; the browser will happily use either. Copy 
http://216.239.39.104/ and paste it into the address line of your browser). 
The way the system of DNS servers works is why, when you first purchase a 
domain name and hosting and want to access your site, your hosting provider 
will usually give you a four-byte numeric address to use while your address 
is being propagated through the network of DNS servers. During that period 
( usually 12 - 48 hours), requests for your domain name may or may not 
result in a numeric address being returned, depending upon which DNS server 
in the chain receives the request.

Settings for DNS and DHCP are on the same tab (General) of your TCP/IP 
properties dialog, and although both offer the option to obtain an IP 
address (DHCP) or DNS server (DNS) automatically or by selecting one 
yourself, they are not the same thing. As you can imagine, saturation of one 
or more of the DNS servers in your chain can cause sluggishness in network 
response, as occurred during the Code Red hit. This can occur anytime the 
immature cretins who imagine themselves "hackers" but are really just script 
kiddies mount a DDoS attack on a network segment.

So, umm... now you know. ;-)
Cheers,
Scott
----- Original Message ----- 
From: "rudy" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, December 07, 2004 10:57 AM
Subject: Re: [wdvltalk] certain sites slow?


At this point you can see the setting for DNS. However, odds are this
is configured by dhcp so you can't change it. Which means this is nice to
know but not helpful.
i don't have a clue what this means, so it's not only not helpful,
it's not even nice to know
;o)
____ • The WDVL Discussion List from WDVL.COM • ____
To Join wdvltalk, Send An Email To: 
mailto:[EMAIL PROTECTED] or
use the web interface 
http://e-newsletters.internet.com/discussionlists.html/
      Send Your Posts To: [EMAIL PROTECTED]
To change subscription settings or add a password:
http://intm-dl.sparklist.com/read/?forum=wdvltalk

________________  http://www.wdvl.com  _______________________
You are currently subscribed to wdvltalk as: [EMAIL PROTECTED]
To unsubscribe send a blank email to [EMAIL PROTECTED]
To unsubscribe via postal mail, please contact us at:
Jupitermedia Corp.
Attn: Discussion List Management
475 Park Avenue South
New York, NY 10016
Please include the email address which you have been contacted with.

____ • The WDVL Discussion List from WDVL.COM • ____
To Join wdvltalk, Send An Email To: mailto:[EMAIL PROTECTED] or
use the web interface http://e-newsletters.internet.com/discussionlists.html/
      Send Your Posts To: [EMAIL PROTECTED]
To change subscription settings or add a password:
http://intm-dl.sparklist.com/read/?forum=wdvltalk
________________  http://www.wdvl.com  _______________________
You are currently subscribed to wdvltalk as: unknown lmsubst tag argument: ''
To unsubscribe send a blank email to [EMAIL PROTECTED]
To unsubscribe via postal mail, please contact us at:
Jupitermedia Corp.
Attn: Discussion List Management
475 Park Avenue South
New York, NY 10016
Please include the email address which you have been contacted with.