[CentOS] Need help with an odd issue I am experiencing

David Petruzzella sektor at dsli.com
Tue Sep 9 15:18:00 UTC 2008


Thanks I read about that, but I am having a hard time forcing duplex, I don't remember the exact error it was giving me at the moment but from what I read it looks like a driver issue.
---------- Original Message ----------------------------------
From: "RobertH" <roberth at abbacomm.net>
Reply-To: CentOS mailing list <centos at centos.org>
Date:  Tue, 9 Sep 2008 07:30:30 -0700

>
>> 
>> I have a server with dual nic's running centos 5.2 1 nic connects to the
>> cable modem, which has 15m d and 2m up, but speed tests barely come back
>> at 5mb down including road runner's internal speed test. I hook up my
>> laptop to the same modem, same port, using the same cable and I get 17mb
>> down. I have ruled out iptables, nics (because same result on both
>> nics), cables, cable modem(with a brighthouse rep) any suggestions would
>> be greatly appreciated. Thanks.
>> 
>
>David,
>
>IME, it is typically (yet not always) a duplex and/or speed issue between
>the NIC port and the switch or device it is talking too.
>
>man ethtool
>
>ethtool eth0
>
>and check to see what speed and duplex are currently in use...
>
>if duplex and/or speed are off I typically hard code a *managed* switch and
>the centos box on whatever ports as necessary by adding this line or one
>similar to it
>
>ETHTOOL_OPTS="speed 100 duplex full autoneg off"
>
>To this and other interface files as necessary
>
>/etc/sysconfig/network-scripts/ifcfg-eth0
>
>At this point a reboot will take care of it or if you don't want to reboot
>now, Then I would make a little script called downup.sh
>
>ifdown eth0
>ifup eth0
>
>and then I chmod 750 that script and then call it like this if from remote
>
>./downup.sh &
>
>So I don't lose connectivity...
>
>There is probably a more elegant command like way to do that...
>
>Be careful if remote box and YMMV
>
> - rh
>
>
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