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Ethernet Collision

By bobo_0121 ·
ISP is telling me that I have collision on my ethernet side. How can I get rid of this problem?

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Ethernet Collision

by -Q-240248 In reply to Ethernet Collision

Collisions are caused by many workstations on a shared medium, such as a hub, or half-duplex switch. Use optimum 100MB/Full-duplex switches, or place a switch and segment the shared medium.

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Ethernet Collision

by bobo_0121 In reply to Ethernet Collision

The question was auto-closed by TechRepublic

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Ethernet Collision

by pxyoung In reply to Ethernet Collision

Bobo - You could have "excess" collisions because you have too many users contending for a single 10BaseT shared Ethernet segment.
Collisions are normal under CSMA/CD (10BaseT Shared Segments), all users share the same logical bus and transmit atrandom intervals over it. When 2 devices transmit at the same time you get a collision.

To breakdown the Ethernet collision domain you can either segment your shared 10BaseT segment with a Layer 2 bridge or replace the 10BaseT hubs to Ethernet switches.

Switches have a logical bus per port and Each port is bridged to all others. Because each port is its own segment there is no contention; there is nothing for the transmission to "collide" with.
Ethernet Switches will also provide you with much greater performance and functionality on your LAN than 10BaseT will allow.

Regards,

Perry Young
Comdisco UK

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Ethernet Collision

by bobo_0121 In reply to Ethernet Collision

The question was auto-closed by TechRepublic

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Ethernet Collision

by NetWill In reply to Ethernet Collision

First, are you using a hub? If you are using a hub, check the utilization percentage. Is it constantly around 40%? If so, replac the hub with a switch or divde your hosts into 2 broadcast domains (2 hubs connected by a bridge or PC with 2 NIC).

Note: It might not be your ethernet LAN that is the bottleneck. Check your gateway to ISP. What is the CPU utilization and memory usage, queueing on it?

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Ethernet Collision

by bobo_0121 In reply to Ethernet Collision

The question was auto-closed by TechRepublic

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Ethernet Collision

by kslove In reply to Ethernet Collision

In addition to checking the hardware utilization of your hub/switch, you should also check the number of protocols, broadcasts that are being generated in your network. Broadcasts send to all the computers on your end. Manually setting the speeds to10/full, 100/full, dependent on the equipment you use (E.g. Cisco) If it is not the hardware and congestion on your network, I would check to make sure you don't have any unnecessary protocols running like Netbui, DLC, Appletalk. Only you know your environment. To actually see the packets that are in your network, download and eval of Sniffer Pro. This will assist you.

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Ethernet Collision

by bobo_0121 In reply to Ethernet Collision

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Ethernet Collision

by bobo_0121 In reply to Ethernet Collision

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