[AG-TECH] Linux networking problems

Robert Olson olson at mcs.anl.gov
Wed Jul 25 11:03:17 CDT 2001


I'm wondering why you have to force the cards to full-duplex? Did you try 
without that? I've never had to poke at them that forcefully.

At 10:57 AM 7/25/2001 -0500, Kay Gunn wrote:

>Our switch is set to full-duplex 100MB (no autonegotiation).
>I am forcing the cards to do full-duplex in /etc/conf.modules.
>
>For the 3c59x card:
>alias eth0 3c59x
>options 3c59x options=204
>
>For the EtherExpress Pro100:
>alias eth0 eepro100
>options eepro100 options=0,0,0x30
>
>I have tried moving the servers to various different switch ports using
>various different cables.  Results do not change.
>
>As an added test, I just blew away the Redhat 7.1 install that was doing
>ftp transfers of 11MB/sec.  I replaced it with the 1.0AG install.  It is
>now doing ftp transfers of less than 3MB/sec.  Same hardware, same switch
>port, same conf.modules/modules.conf setting to force fullduplex.
>
>Is there a way I can check on a 6.2 box to tell what the eth card is
>really running?  Redhat 7.x comes with the mii-tool utility, which will
>tell you what your card is running, but I haven't been able to find this
>for 6.2.  I can see by running multiple ifconfig -a eth0 commands over
>time that I am not getting any errors or collisions, which is what I'd
>expect with correctly negotiated fullduplex. However, I'm not sure how
>reliable the info from ifconfig is.  I'm going to try to get our network
>admin to look on the switch to see if he sees errors for this node.
>
>Thanks alot for the replies so far.
>
>Kay Gunn
>Johnson & Johnson ATR Group




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