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Re: Network Question

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On 08/03/14 10:17, RJH wrote:
> I've just installed some cat6 cable in my house - thought I might as
> well while the plasterers were in. I used /some/ common sense, but some
> cables were routed near mains cables and I wired the wall sockets
> myself. So some margin for error ;-)
>
> All works, and I've checked continuity with a cheap cable tester.
>
> Transferring big files is OK - about 1GB/min. Internet works fine -
> 50Mbps over ehternet, about the same with wireless enabled.
>
> However, playing video (say, 1GB avi rips) through the Mac Mini/VLC from
> the NAS results in freezing every 10 minutes or so. Same file stored on
> the Mac Mini plays fine. I'm not sure if this is a fault with the
> network. It's wired like this:
>
> http://flic.kr/p/kPnozh
>
> Any clues appreciated.
>

Two checks you can do - applicable to linux and MacOSX but should be 
easily adaptable to other OSes.

the "ifconfig" command (any *nix, linux and MacOSX) will give you error 
information. eg:

wlan0     Link encap:Ethernet  HWaddr 00:24:d7:53:d4:e4
           inet addr:10.0.0.55  Bcast:10.0.0.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:12657 errors:0 dropped:0 overruns:0 frame:0
           TX packets:10923 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:4818078 (4.8 MB)  TX bytes:1856110 (1.8 MB)

Look at the "errors" - should be 0 or near enough.

The other test you can do is put a computer at each end of each network 
cable in turn (disconnecting all other equipment, switches etc) so the 
computers are directly linked by just that one installed Cat6 cable plus 
the patch leads:

Then check with the computers that the link comes up at 1000 (or 1gig) 
and not "100" or "10".

2nd, give both computers IP addresses on the same (any) subnet so they 
can talk to each other and run "iperf" (installable on linux, 
equivalents probably exist on other OSes).

You may not get 1000Mbit/sec due to limitations with one or both 
computers. But you should get 500Mbit upwards. Check with data flows 
both ways.


That's how I test mine.

Bear in mind that Cat6a (not Cat6) is good to 10gigbit/sec if installed 
properly. And IME it's quite hard to bugger up small scaled gigabit 
installations to the point where it works but poorly.

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Network Question RJH <patchmoney@gmx.com> - 2014-03-08 10:17 +0000
  Re: Network Question RS Wood <rsw@therandymon.com> - 2014-03-08 10:22 +0000
    Re: Network Question RJH <patchmoney@gmx.com> - 2014-03-08 11:19 +0000
  Re: Network Question Tim Watts <tw_usenet@dionic.net> - 2014-03-08 13:09 +0000
    Re: Network Question RJH <patchmoney@gmx.com> - 2014-03-09 21:19 +0000
      Re: Network Question Tim Watts <tw_usenet@dionic.net> - 2014-03-09 22:43 +0000
  Re: Network Question Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-03-08 20:15 +0000
    Re: Network Question RJH <patchmoney@gmx.com> - 2014-03-09 21:25 +0000

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