Forcing 100mbps throughput on GB NIC

lca1630 · 06-10-09, 04:08 PM

I need to to set up a testing scenario for my QA guys in which the NVIDIA Quadro FX 3400/4400 GB NIC only allows 100mbps throughput. I can configure my switch gear for a certain port to only allow this but am afraid that the card will autonegotiate to the higher throughput. Any ideas on how to configure the card to not autonegotiate and instead act like a 100mbps NIC. The card is in an IBM running CentOs 5.3. Thanks for your help.

phaedrusiszen · 06-10-09, 04:09 PM

Quote:

Originally Posted by lca1630

I need to to set up a testing scenario for my QA guys in which the NVIDIA Quadro FX 3400/4400 GB NIC only allows 100mbps throughput. I can configure my switch gear for a certain port to only allow this but am afraid that the card will autonegotiate to the higher throughput. Any ideas on how to configure the card to not autonegotiate and instead act like a 100mbps NIC. The card is in an IBM running CentOs 5.3. Thanks for your help.

Check out ethtool.

etherfish · 06-10-09, 08:06 PM

ethtool -s eth0 autoneg off speed 100 duplex full

If it won't work without autonegotiation, use

ethtool -s eth0 advertise 0x008

lca1630 · 06-11-09, 10:04 AM

Hey guys, Thanks for the great, speedy info. The ethtool was definitely the answer and it is working as needed. Thanks again.

06-10-09, 04:08 PM	#1
lca1630 Registered User Join Date: Jun 2009 Posts: 2	Forcing 100mbps throughput on GB NIC I need to to set up a testing scenario for my QA guys in which the NVIDIA Quadro FX 3400/4400 GB NIC only allows 100mbps throughput. I can configure my switch gear for a certain port to only allow this but am afraid that the card will autonegotiate to the higher throughput. Any ideas on how to configure the card to not autonegotiate and instead act like a 100mbps NIC. The card is in an IBM running CentOs 5.3. Thanks for your help.

06-10-09, 08:06 PM	#3
etherfish Registered User Join Date: Nov 2007 Posts: 18	Re: Forcing 100mbps throughput on GB NIC ethtool -s eth0 autoneg off speed 100 duplex full If it won't work without autonegotiation, use ethtool -s eth0 advertise 0x008

06-11-09, 10:04 AM	#4
lca1630 Registered User Join Date: Jun 2009 Posts: 2	Re: Forcing 100mbps throughput on GB NIC Hey guys, Thanks for the great, speedy info. The ethtool was definitely the answer and it is working as needed. Thanks again.