Networking
Showing results for 
Search instead for 
Do you mean 

Am i running full or half duplex ??

SOLVED
Go to Solution

Am i running full or half duplex ??

Hi there,

Can anyone tell me how i can confirm whether my network card is setup as either 10 or 100 BT, and more importantly, whether it is running at FULL or HALF duplex please ?

I have had a good browse in NMMGR and cannot find any reference whatsoever.

Many thanks in advance !
Sean

Note :
If its any use to anyone, here is the output from linkcontrol......

%linkcontrol @;status=all
Linkname: DTSLINK Linktype: IEEE8023 Linkstate: CONNECTED
Physical Path: 56/56
Current Station Address: 08-00-09-D4-E2-6A
Default Station Address: 08-00-09-D4-E2-6A
Current Receive Filter: broad(1) any(0) k_pckts(1) x_pckts(0)
Current Multicast Addresses:
09-00-09-00-00-01 09-00-09-00-00-03 09-00-09-00-00-04
09-00-09-00-00-06
Transmits no error 27936549 Receives no error 196839139
Transmit byte count 2473487506 Receive byte count 2555005021
Transmits error 1115 Receives error 0
Transmits deferred 1716738 Carrier losses 0
Transmits 1 retry 1881024 CRC errors 0
Transmits >1 retry 649608 Frame losses 235
Trans 16 collisions 0 Whole byte errors 0
Trans late collision 0 Size range errors 0
802 chip restarts 0 Receives dropped 0
Heartbeat losses 27930932 Receives broadcast 140146041
Receives multicast 0
6 REPLIES
Honored Contributor Honored Contributor

Re: Am i running full or half duplex ??

"Transmits ... retry" and "...deferred" suggest collisions and carrier sense, which means half-duplex. Doesn't say anything about speed though. If the system is "old enough" the core network interface was 10 Mbit/s HD only. What model system do you have?

That there are no late collisions suggests (to me at least) that there is no duplex mismatch. Usually, when there is a duplex mismatch the side in half-duplex will report at least some late collisions.
there is no rest for the wicked yet the virtuous have no pillows

Re: Am i running full or half duplex ??

thanks for your reply Rick !

We have checked and confirm yes its an old server - a HP3000/918RX.
The network cable is connected to the AUI port via a "Canary MTX-1070 transceiver"

rgds,
Sean
Honored Contributor Honored Contributor

Re: Am i running full or half duplex ??

918 - that would indeed be a 10 Mbit HD-only NIC present. There was an HP-PB (aka NIO) 100BT NIC offered - may have even been MPE/XL (sorry, I left MPE before it became ix :) but it would not have had an AUI port. So, I'm quite certain it is 10HD only. Good, old-fashioned, Ethernet :)
there is no rest for the wicked yet the virtuous have no pillows

Re: Am i running full or half duplex ??

sorry for the delay in replying Rick.

I will forward the information onto our network guys for further consideration.

Re: Am i running full or half duplex ??

Hi again Rick,

I have been doing some further checking and can confirm that the transfer that is failing is from a HP 3000/939LX to a HP 3000/918RX

Can you confirm if both of these servers are restricted to 10 half duplex please ?

Our network team have been performing ping checks and are seeing the packet losses also.

Regards,
Sean
Honored Contributor Honored Contributor

Re: Am i running full or half duplex ??

At the risk of showing my lack of familiarity with later Series 900 models (by then I was in UX-land), yes, I believe both those had 10Mbit/s HD only core LAN interfaces.
there is no rest for the wicked yet the virtuous have no pillows