ping loopback with tcp/ip disabled

Windows XP

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ping loopback with tcp/ip disabled

Postby d2FsbHlfbGxhbWEx » Sat, 03 Feb 2007 12:12:07 GMT

Pinging the loopback address tests confirms that TCP/IP is running, correct?

Is there any reason that I can still ping the loopback address even though I 
have disabled TCP/IP? Or is my understanding of what pinging the loopback 
address does wrong?

Re: ping loopback with tcp/ip disabled

Postby Steve Winograd [MVP] » Sat, 03 Feb 2007 18:52:31 GMT

In article < XXXX@XXXXX.COM >,



The loopback address is internal to the TCP/IP stack and can be used
even with no installed network adapters.

How did you disable TCP/IP?
-- 
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see.  I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
 http://www.**--****.com/ 

Re: ping loopback with tcp/ip disabled

Postby d2FsbHlfbGxhbWEx » Sun, 04 Feb 2007 11:26:01 GMT







I disabled TCP/IP through the properties of the connection under the 
networking tab. A lab in the Microsoft 272 book instructed me to disable 
TCP/IP by unchecking the box there, which should keep pinging the loopback 
from working. It did not, and my instructor did not have an answer as to why.

Does unckecking the box not actually disable TCP/IP for the connection?

Re: ping loopback with tcp/ip disabled

Postby Steve Winograd [MVP] » Sun, 04 Feb 2007 16:46:19 GMT

In article < XXXX@XXXXX.COM >,



Unchecking the box disables TCP/IP on that network connection, and
only on that network connection.  It has no effect on other network
connections, and it has no effect on the loopback address.

The loopback address isn't associated with any network connection.
It's internal to the TCP/IP stack, and TCP/IP runs even when TCP/IP
isn't bound to any network connections.   To demonstrate that, you can
un-install all network adapters, open a command prompt window, and use
the "route print" command to show the TCP/IP route table.  It will
show:
  
   127.0.0.1  255.0.0.0  127.0.0.1  127.0.0.1  1
-- 
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see.  I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
 http://www.**--****.com/ 

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