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Old 06-10-09, 04:08 PM   #1
lca1630
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Default 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.
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Old 06-10-09, 04:09 PM   #2
phaedrusiszen
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Default Re: Forcing 100mbps throughput on GB NIC

Quote:
Originally Posted by lca1630 View Post
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.
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Old 06-10-09, 08:06 PM   #3
etherfish
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Default 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
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Old 06-11-09, 10:04 AM   #4
lca1630
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Default 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.
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