Try using donald's mii-diag from his page at cesdis..

http://cesdis1.gsfc.nasa.gov/linux/diag/

use mii-diag -A mediatype

hth,
Arni


LaRoy McCann wrote:
> 
> I have a 3c905b-tx card and an smc card setup as a router for 2 networks.
> (192.6.21.0 and 192.168.1.0)
> 
> Everything works now, but I can not get the 3com nic to work at 100Tx.
> When I first boot the router (Redhat 6.0 / 2.2.5-15) the 100mb light lights
> up on the linksys etherfast 10/100 8-port hub.
> As the system configures the either ports the light goes out, then back on
> at only 10mb.
> 
> I have tried the latest 3c95x code, .99L, which did not help.  But, as I
> was testing I noted that "insmod 3c95x" will leave the light at 100mb.  It
> is when I do the "ifconfig eth0 192.168.1.1 netmask 255.255.255.0" that the
> light goes off and back on to 10mb.
> 
> I tryed to use the "ifconfig eth0 192.168.1.1 media 100baseTx", but that
> gives the following error.
> "SIOCSIFMAP: Operation not supported"
> 
> dmesg gives the following lines about the card.
> "eth0:  3Com 3c905B Cyclone 100baseTx at 0xfc00,  ***INVALID CHECKSUM
> 000a***  00:10:5a:62:d9:41, IRQ 10"
> "8K byte-wide RAM 5:3 Rx:Tx split, 100baseTX interface."
> "Enabling bus-master transmits and whole-frame receives."
> 
> Is ifconfig broken? (ifconfig version 1.39 / net-tools version 1.51)
> 
> LaRoy McCann
> Electrical Engineering Manager
> Roach Conveyors
> Hwy 463 N.
> Trumann, AR 72472
> (870) 483-7631 x638 voice
> (870) 483-7049 fax
> [EMAIL PROTECTED]
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