[K12OSN] Network Question
christiansen_j at hotmail.com
Sat Feb 12 23:23:07 UTC 2005
All of the switches go into new 10/100 dell or dlink switches. I don't know
more than that, but I'll check. Our cables are rarely checked after
install... I know, but our techie is the only one for 9 schools and ...
We did install a new fiber backbone at your and a couple of others
encouragement last summer. Things were just awesome here for almost 3
months, until more old recycled cat5 got added to the extremities of the
network. Until then, the K12LTSP server system ran without a single issue-
smb printing, nis, nfs, clients- all perfect. Now sometimes we can't print,
kids can't access the NIS server (also the K12LTSP server) or clients just
How do I check to see if autonegotiation is is on?
From: "Terrell Prudé, Jr." <microman at cmosnetworks.com>
To: jim at linux.ca,"Support list for opensource software in
schools." <k12osn at redhat.com>
Subject: Re: [K12OSN] Network Question
Date: Fri, 11 Feb 2005 22:43:46 -0500
Jim Christiansen wrote:
>Hello, Our technician was in the building pulling cat5 and after he
>left this am, my librarian came to me to inform me that the clients
>were running at 1/2 speed.
>I just thought to run ifconfig and I see carrier:14197 and
>overruns:12141.... Great. I know this isn't good.
>Does anyone know what this means? Thanks, Jim
>Here is my complete ifconfig:
>[root at linux-thin1 ~]# ifconfig
>eth0 Link encap:Ethernet HWaddr 00:E0:81:28:27:52
> inet addr:192.168.1.175 Bcast:192.168.1.255
> inet6 addr: fe80::2e0:81ff:fe28:2752/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:126270015 errors:0 dropped:0 overruns:12141
> TX packets:153628098 errors:0 dropped:0 overruns:0
> collisions:0 txqueuelen:1000
> RX bytes:1069418867 (1019.8 MiB) TX bytes:652818974
> Interrupt:169 Base address:0x2000
>lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:315878 errors:0 dropped:0 overruns:0 frame:0
> TX packets:315878 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:204548481 (195.0 MiB) TX bytes:204548481 (195.0
What kind of gear are these drops plugged into? Hubs, switches, and at what
speed? If they're hubs, you're going to see a reduction in throughput. If
they're half-duplex switches, it won't be as bad. Optimum is full duplex.
If you're using 100Mbps/FDX switches, you might check to see if your
autonegotiation is 1.) turned on <they usually are by default>, and
2.) actually working right.
Also, did he perform a full cabling test, and if so, did he give you a copy
of the results? Wiring contractors are supposed to do that.
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