Mailinglist Archive: opensuse (908 mails)

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Re: [opensuse] On redundant technology and the context for its use
On 2016-06-05 16:33, James Knott wrote:

I'd like to hear it. The only thing a hub can do that an unmanaged
switch can't do is monitor traffic. But sticking a 10 Mb half duplex
device into a modern network is going to kill performance. On the other
hand, a managed switch, with port mirroring, is capable of monitoring at
full wire speed.

Except that simultaneous speed or however is called, gets killed.
Everything on all ports have to be copied onto a single port, so max
total speed is that of that single port.

Similar to having a gigabit hub.

Are you aware of any company that still makes Ethernet hubs? I haven't
seen a new one in many years. On the other hand, I recall one project I
was working on, when someone was trying to find out why the network was
so slow. It turned out someone had used a hub, instead of a switch. In
this applications, a lot of computers were being reimaged via the
network and the 10 Mb hub really killed performance.

If the internet connection is a 1 MB ADSL (what I had not long ago), a
10 MB hub is fine as long as you only connect to internet, not between
the computers in the house. Internet is slow, after all (in that house).

However, as soon as you try to transfer a file between two computers,
performance is terrible. Even a usb flash stick writes faster.

I think that is what I had till recently, a 100Mb hub. Wish I could confirm.

Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 "Bottle" at Telcontar)

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