May 19, 2008
MCP Magazine News
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Greg's Weekly quickTIP: Deconstructing PING
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IN THIS ISSUE:
- Greg's Weekly quickTIP: Deconstructing PING
- Redmond Radio: Gates Highlights R&D, Touch Wall; HP
Buys EDS; Mo
- Special Offers: Single Sign-On; Messaging and Web Threats
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SPONSOR: Free Greg Shields "e-brief" - Active
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GREG'S WEEKLY QUICKTIP: Deconstructing PING
By Greg Shields
Ahhh, "ping" -- the administrator's best friend
when things go south.
I'll bet like myself you've developed an almost unnatural
ping reflex
when the phone rings. For me, after all the years doing IT
in one form
or another, that "Windows button-R, cmd, ping
" keystroke
sequence flies out of the fingertips before a conscious
thought hits
my frontal lobes. In a way, it's almost primal, like
breathing or
blinking one's eyes.
But in our daily pinging around the network, do we really
have an idea
of the exact meaning of its responses? I know that when I
see anything
other than those comforting two words "Reply
from," I'll sometimes
hit the panic button. But, in thinking about this column I
realized
that there's a lot more to ping than meets the eye. I
wondered what
"destination host unreachable" means and how
specifically does this
error message compare to "request timed out"?
So I did a little digging to turn up the official
explanations, and
found only one good document on the Internet that gave me
the answers
I'm looking for. That document, titled the "Windows
2000 Error Messages
Reference" http://tinyurl.com/4l76ao , includes a run-down of every
ping error message and what it specifically means. Here are
a few,
taken directly from the document:
DESTINATION HOST UNREACHABLE: The host that you are trying
to ping is
down or is not operating on the network.
DESTINATION NET UNREACHABLE: The gateway reported that the
network
running the Internet Control Message Protocol (ICMP) for the
IP
address entered on the command line could not be reached.
BAD IP ADDRESS: An invalid IP address was entered on the
command line.
The IP address must be entered in a dotted decimal format.
Verify
that the IP address that you are trying to ping is in the
proper format.
Destination specified is invalid: An invalid address has
been entered
on the command line.
...and our old favorite...
REQUEST TIMED OUT: The ping command timed out because there
was no
reply from the host. Ping your local address 127.0.0.1. This
will
tell you that TCP is functioning. It does not tell you that
your
network card is functioning. Ping your default gateway or
next hop
Router. This will show that the router is up. Ping beyond
the next
hop Router. If the ping fails, the request timed out can
mean that
the destination host is down or that there is no route back
to you.
Destination Net Unreachable will show the IP address of the
Router
that tried to route the packet but did not have a valid
route.
As you can see, there is a big difference between
"destination host
unreachable" and "request timed out." This is
particularly noticeable
in Windows Vista, where ping's error messages have been
tuned to be
more specifically accurate. As such, a bad response in Vista
has a
tendency to get a different answer than the usual Windows XP
"request
timed out."
Comment: http://mcpmag.com/columns/article.aspx?editorialsid
=2621#post
AND NOW, FOR SOMETHING COMPLETELY DIFFERENT: Greg Wants your
Very
Best SMS/SCCM Queries
Query creation in SMS & SCCM is an art, and building the
very best
queries for collections and reports is key to doing SMS
& SCCM well.
Contributing Editor Greg Shields wants to showcase your very
best
queries for an upcoming Redmond column. Help out a fellow
administrator and get a free Redmond T-shirt to boot!
Greg Shields, MCSE: Security, CCEA, is an independent
author,
instructor, and consultant based in Denver, Colo. A
contributing
editor to Redmond magazine, MCPmag.com and a popular speaker
at
TechMentor events, Greg?s recent book Windows Server 2008:
What's
New/What's Changed, is now available at www.sapienpress.com.
gshields redmondmag.com
Check out MCPmag.com's column archive for more savvy tips
and tricks
from Jeff, Greg Shields, Chris Wolf and other frequent
contributors.
http://mcpmag.com/columns/
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REDMOND RADIO for Week of May 19
Hosted by Michael Domingo
Take a quick listen to what made news last week in the world
of
Redmond and IT:
* Gates Highlights R&D, Touch Wall
* Windows Essential Server Preview
* Developers Waiting on Vista
* HP Buys EDS
Plus, listen to find out how to enter the weekly Redmond
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