> -----Original Message-----
> From: Rafael R. Sevilla [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 16, 2000 2:08 PM
> To: Philippine Linux Users' Group Mailing List
> Subject: [plug] 100BaseT dropping packets
>
>
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>
> Our cafe has just gone through a major system upgrade, so now
> we have 16
> stations with respectable configurations, but now we're having slight
> problems with networking. We also updated all our NIC's to
> 10/100 Fast
> Ethernet, and got a new switch to match, but now, around five
> of the 16
> machines are dropping packets. Flood pinging them shows that
> the worst
> one drops as much as 30% of the packets I send, with the rest
> averaging
> 10% or so of the packets, which is still a Bad Thing. These
> machines are
> extremely slow when they try to connect to the proxy
> server... What could
> be causing this? Do we have bad cabling? Or is there some other
> plausible reason? All our network cards are CNet 10/100's, as is our
> switch.
>
First of all, latency are common problems with switches. When switches are
turned on, it goes into three levels, listening, learning, then forwarding.
These includes learning the MAC address and putting it on the CAM and IP
address if it supports VLAN. Let say a machine is up and running but not
connected to the switch, if you connect this machine to the switch, it will
not immediately be able to ping anyone. It must go through the above process
which takes 30 to 45 seconds.
For your problem, why don't you check the mode, there should be different
choices for fast ethernet, 10-baseT @half, 10-baseT @full, 100-baseT @half,
100-baseT @full, and Auto. Try it on one port of the switch and the machine
connected to that port. Remember, 10BaseT mode will not be able to talk to a
100BaseT mode. That's what you call Link Pulses. Check your cables also. You
should follow the standards, WO-O-WG-B-WB-G-WBr-Br. Check also the setting
of the port on the switch, if a machine is connected directly to the switch
port, the setting shouldn't be STP (Spanning Tree Protocol), but if a hub is
connected to it, then it should be STP.
...hth :-)
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