problems with gigabit speeds on dual network card

Genes MailLists lists at sapience.com
Sun Sep 19 15:23:30 UTC 2010


On 09/19/2010 01:18 AM, Gilboa Davara wrote:

> Unlikely.
> We use Intel NIC's (both 1GbE and 10GbE) extensively (up to  16 linkes
> per machine) for link monitoring without issues.

  Great to know thanks ..


> 
> Try connecting the two links to each other.
> Set their respective IP's to 1.1.1.1/255.255.255.0 (eth1) and
> 2.2.2.2/255.255.255.0 (eth2).
> Now, check that they both auto negotiate to 1GbE/Full duplex.
> If they don't, you have a wire issue. (Is it CAT 5 or above?)
> If they do, do the following:
> 
> 1. Install iptraf. ($ yum install iptraf -y)
> 2. Launch iptrag and configure it to work in promiscuous mode (Configure
> -> Force promiscuous mode).
> 3. Go back, select the "general interface statistics".
> 4. From another console, start flood pinging.
> ping -s 1400 -f -i eth2 -b 1.1.1.255
> 5. Return to the iptraf console, you should the see the packet increase
> linearly on both interfaces. If it doesn't, something is broken, if it
> does - you have a switch problem.
> 

  Great idea ... I will try this when I'm able ..


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