Member Avatar for bk_raavi

Hai
--I have HP PCs,IBM PCs,IBM Servers Of 21 Nos. Those are networked and working on 10 Mbps Switch with builtin LAN Card from a longtime normally. But Yesterday i changed the connections to 100 Mbps Switch, from that time some Of the LAN Connections (Systems)are working normally and remaining are not working.

--PCs are running Under Win2k Professional and Servers are Win2k Server OS.

Pls give the Solution.

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Likely causes: duplex/speed auto‑negotiation failures, bad or wrong-category patch cables, a switch port configured differently (VLAN/port security/speed forced), or NIC driver/firmware issues. The OP () reports Intel PRO/100 VE adapters, so pure 10Mbps-only NICs are unlikely; that narrows the problem toward negotiation, cabling, or per-port switch configuration (echoing points from , and ).

Quick diagnostic checklist (work from physical layer upward):

  • Check link/activity LEDs on both NIC and switch port. No LED = cable/port or physical wiring fault.

  • Swap the failing machine onto a known-good cable and a port that already works. If it comes up, the original cable/patch panel/port is suspect.

  • Verify addressing and basic IP reachability:

    ipconfig /all
ping <gateway-IP>
arp -a
netstat -e

    Look for APIPA addresses (169.254.x.x), duplicate IPs, or a lot of Rx/Tx errors.

  • If link is up but traffic is unreliable, collect NIC and switch port counters (CRC/FCS, collisions, input errors) and compare with a working port. Use a packet capture (Wireshark) to confirm retransmits/duplicate ACKs when needed.

Practical fixes and checks not covered earlier posts:

  • Replace suspect patch cables with Cat5/5e rated cables; older Cat3 wiring will fail at 100Mbps.
  • If the switch is managed, inspect per-port speed/duplex, VLAN membership, and error/port-security logs. Ports in the wrong VLAN or err‑disabled will appear dead.
  • Update the Intel NIC driver to a current, Win2k/XP-compatible revision before forcing settings. If forcing speed/duplex is required, force both ends to the same values (don’t force one side and leave the other on auto).
  • As a final isolate, connect a laptop directly to the switch port used by a working machine, then to the failing machine’s cable path (patch panel) to find the fault.

Note: document any changes and perform tests outside business hours on production gear. The combined approach above usually finds whether the root cause is cabling, switch config, or NIC/driver behavior.

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Member Avatar for chanto!

Hai
--I have HP PCs,IBM PCs,IBM Servers Of 21 Nos. Those are networked and working on 10 Mbps Switch with builtin LAN Card from a longtime normally. But Yesterday i changed the connections to 100 Mbps Switch, from that time some Of the LAN Connections (Systems)are working normally and remaining are not working.

--PCs are running Under Win2k Professional and Servers are Win2k Server OS.

Pls give the Solution.

Are any of the systems equipped with 10Mbps network cards? Does your 100Mbps switch support auto-negotiation? If it doesn't then you have a speed mismatch.

Member Avatar for bk_raavi

My Computer having the Intel(R) PRO/100 VE Network Connection,
This is giving support to 10Mbps.

Member Avatar for TheComputerGeek

All of the machines have this network card? What is the switch?

Member Avatar for Member #2466

You have to go into the control panel, system, hardware, device manager. From there look for your network adapter. Right click on it, choose properties, select the advanced tab. Make sure that your cards settings are at

Flow Control: Generate and Respond
Link Speed: 100Mb Full duplex (it should be default set to auto)
QoS Packet: Match your other computers on the network...probably disabled
Wake On: Your choice :)

The problems result if you leave it on Auto and it detects half duplex when it should be set to full duplex. I've had problems with our dell computers at work doing this when I migrated to 100Mbps as well. A quick change on the NIC itself eliminated my problems.

Member Avatar for i686-linux

I have seen this as well with auto-negotiation on Dell machines, as well as some PCMCIA NICs. Definetely hardcode the speeds, both on the switch (if possible) and on the actual computer. If 100mb-full doesn't work, then try 100mb-half, etc.

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