[K12OSN] Network Question
"Terrell Prudé, Jr."
microman at cmosnetworks.com
Sat Feb 12 03:43:46 UTC 2005
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 Mask:255.255.255.0
> 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 frame:0
> TX packets:153628098 errors:0 dropped:0 overruns:0 carrier:14197
> collisions:0 txqueuelen:1000
> RX bytes:1069418867 (1019.8 MiB) TX bytes:652818974 (622.5 MiB)
> 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 MiB)
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.
--TP
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