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  1. #1

    Join Date
    Apr 2005
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    Melbourne
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    Default Network Utility question...

    When you're looking at your network interface(s) in Apple's "Network Utility" there's a section on the right hand side called "Transfer Statistics".

    Now I get the general idea with Sent & Recv packets but can someone explain "Collisions" and how the Send/Recv Errors occur? I seem to have a few collisions on my desktop.

    Also is there a good way to monitor your machines network activity? I've heard of people mentioning "ethereal" but have no idea about it. I don't want to look in packets just more of a graph and stats for each interface, be great if I could limit it to port traffic too like port 80 only for monitoring HTTP throughput.

    Cheers!

  2. #2

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    Default

    *bump* anyone???

  3. #3

    Join Date
    Jan 2005
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    Brisbane
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    516

    Default

    Now I get the general idea with Sent & Recv packets but can someone explain "Collisions" and how the Send/Recv Errors occur? I seem to have a few collisions on my desktop.
    A collision in ethernet, is when two ethernet frames are transmitted onto the network at the same time. Common when hubs are used and common on wifi. Not so common in a switched network, they are usually only seen when there is a duplex mismatch -- when the switch is set to full duplex (can send and receive at the same time) and the host is connected at half duplex (can send, or receive, but not at the same time).

    A few collisions and errors are nothing to worry about, but when there are a lot and occurring regularly it is time to check the switch port and host to make sure they are negotiating correctly.

    Also is there a good way to monitor your machines network activity? I've heard of people mentioning "ethereal" but have no idea about it. I don't want to look in packets just more of a graph and stats for each interface, be great if I could limit it to port traffic too like port 80 only for monitoring HTTP throughput.
    Ethereal or Wireshark as it is now known, is for decoding packets, so not the right tool for the job. Something like MenuMeters will show you in and out traffic per second in your menu bar, I am not aware of any that will show you stats for individual protocols though.

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