From: Church, Chuck (cchurch@netcogov.com)
Date: Mon Jan 10 2005 - 16:43:19 GMT-3
Just to clarify, the loopback IP network is defined as 127.0.0.0/8.
'Route print' in a DOS window will show it reachable via the 127.0.0.1
interface. All virtual, of course. Not to confuse things, but MS did
have a loopback interface (at least they did in NT 4.0). It was useful
for configuring protocol bindings, etc if you didn't yet have a NIC in
the box. Check the archives though, because we did beat this dead horse
a couple months ago on groupstudy. Never should we associate the term
'loopback' with the 169.254.0.0/16 net. The term 'loopback' indicates
sending packets only to yourself, not yourself and 65,534 of your
closest friends :)
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Walker, James - Is
Sent: Monday, January 10, 2005 2:21 PM
To: James Ventre; ccielab@groupstudy.com
Subject: RE: Fw: Microsoft Loopback.
Let me put on my MCSE hat, LOL.
When you ping 127.0.0.1 and it replies back, it means that your software
portion
of the tcp/ip stack is working properly.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
James
Ventre
Sent: Monday, January 10, 2005 2:00 PM
To: ccielab@groupstudy.com
Subject: Re: Fw: Microsoft Loopback.
169.254.0.0/16 is the auto-configure range. And it's not just MS Stuff,
it's actually RFC'd (RFC3330)
http://www.faqs.org/rfcs/rfc3330.html
169.254.0.0/16 - This is the "link local" block. It is allocated for
communication between hosts on a single link. Hosts obtain these
addresses by auto-configuration, such as when a DHCP server may not
be found.
If 127.0.0.1 isn't a loopback ... then what is answering for it when I
ping it -
and all I have plugged into my NIC is a looped RJ45?
James
Joseph D. Phillips wrote:
>No, it's not.
>
>If you got that question on the exam, Cisco was probably referring to
>169.254.0.0/16
>
>Kind of dirty pool because Microsoft itself does not refer to this
address
>range as such. To Microsoft, it's its "autonet" address range, used for
>autoconfiguration of network interface adapters.
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