[windows2000] Re: Need some basic instruction in networking

  • From: "Herchenbach, Jim" <jherchenbach@xxxxxxxxxx>
  • To: <windows2000@xxxxxxxxxxxxx>
  • Date: Fri, 7 Nov 2003 14:28:21 -0600

Just a hunch, but are all your PC's patched to keep out the slammer type 
virus'.  Slow connections due to high broadcast are symptoms of this.

If your limited in net monitoring software, remove pc's from the switch one at 
a time, to see if problem goes away.

-----Original Message-----
From: Sullivan, Glenn [mailto:GSullivan@xxxxxxxxxxxxxx]
Sent: Friday, November 07, 2003 2:25 PM
To: 'windows2000@xxxxxxxxxxxxx'
Subject: [windows2000] Re: Need some basic instruction in networking


A CSU/DSU takes a T1 frame connection and converts it to a different kind of
connection.  Sometimes that connection is to a PBX, sometimes it is to an
Ethernet jack.

Does the CSU/DSU have an RJ45 Ethernet Jack on it?

Is the Edge Server a firewall, or is there something between the edge server
and CSU/DSU?

Just prodding for more information...

Have you dropped a Packet Analyzer onto the wire to see what is eating all
your bandwidth?  Ethereal is a good free one...

I guess what I would start with is this:
(this is assuming that all traffic passes through the edge server)

1. Disconnect your edge server's outward-facing NIC from whatever it is
plugged into, and plug it into a hub.
2. Run a line from that hub to where ever the edge server NORMALLY plugs
into.
3. Figure out an IP address that is on the same subnet as the Edge Server's
outward-facing NIC
4. Assign that IP address to a spare machine with ethereal on it.
5. Plug the spare machine into the hub from step 1.
6. Start ethereal.
7. Look at the traffic... try to find which protocols are eating the most
bandwidth.

If I had to guess, it is
Kazaa/DirectConnect/Morpheus/someothernapsterreplacement.

HTH,

Glenn Sullivan, MCSE+I  MCDBA
David Clark Company Inc. 

-----Original Message-----
From: Rod Falanga [mailto:rfalanga@xxxxxxx]
Sent: Friday, November 07, 2003 3:13 PM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Need some basic instruction in networking


For about 6 weeks now we have been experiencing really horrible connectivity
problems.  We have a T1 line, but our network speeds to the Internet have
been abysmal at best.  I have run some tests using DSLReports.com and have
found speeds as low as 14 kbps!!!

I've contacted Qwest and they have run some tests on our line from our
office to the ISP.  They have informed me that everything is fine.

So, the problem, as I see it, is either here in our building, somewhere
(server, router, cables, something), or at the other end.  I've tried
replacing cables, and have done what I could to replace all of the CAT-5
cables I could fine, but sometimes some cables are connected to things I
don't understand. For example, we've got something called a T1 CSU/DSU.  I
don't have the foggiest idea what that is.  And replacing CAT-5 cables on
that this just makes us loose our Internet connectivity completely.

So, what are things like CSU/DSU?  Or, let's put it differently, starting at
the ISP who supplies us with T1 access, what "things" are in between that
and the NIC card in my edge server?

 
Rod

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