two NICs and speed issues

sam at illawarra.org sam at illawarra.org
Mon Jul 19 14:11:44 UTC 2004


> So if you disconnect the modem (10Mbit) the transfers are fast on the
> LAN side.  And if you set the LAN NIC to 10Mbit and connect the modem to
> the other NIC your transfer speeds are fast?
Correct.

>
> Have you looked at the stats on the interfaces to see if you are taking
> any errors?
>
> ifconfig -a
>
> will give you a listing of each interface.  Pay attention to the RX and
> TX lines, you will see counters for errors, dropped, overruns, and
> frame.  If for some reason you are getting errors on packets they will
> be retransmitted.  Lots of errors will result in very poor performance
> but the transfer will still get through due to the TCP/IP protocol.
>
No RX/TX errors and such.

> Also what type of switch are you using?  I have seen some switches that
> have problems negotiating the right settings.  When using 100Mbit
> connections you want to have full duplex set.  For 10Mbit connections
> half duplex is usually the default.  If you have a duplex problem
> between the NIC and the switch you will see the error count increase
> during a transfer.
centrecom fs708

>
> From the description it almost sounds like the interface connecting to
> the modem is forcing either duplex or speed settings on the other
> interface.  Have you checked that using mii-tool in both configurations?
> --
> Scot L. Harris
> webid at cfl.rr.com
>
> It's not hard to admit errors that are [only] cosmetically wrong.
> 		-- J.K. Galbraith
>
>
> --
> fedora-list mailing list
> fedora-list at redhat.com
> To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
>






More information about the fedora-list mailing list