[CentOS] Could not setup Speed and Duplex on CentOS 5.5

Greetings,

I recently installed CentOS 5 on Dell PE 1750 server. I have noticed that
the speed and duplex settings are 100 Half Duplex. I tried to change the
duplex settings to full, but no success. I got the error message "Cannot get
current device settings: Operation not supported". Does anyone else
experience this issue?. Below is the error message and some more details
about my box. Any help will be highly appreciated.

[root at xentwo ~]# ethtool -s eth0 speed 100 duplex full autoneg on
Cannot get current device settings: Operation not supported
  not setting speed
  not setting duplex
  not setting autoneg

[root at xentwo ~]# ethtool -s eth0 speed 100 duplex full autoneg off
Cannot get current device settings: Operation not supported
  not setting speed
  not setting duplex
  not setting autoneg

[root at xentwo ~]# mii-tool eth0
SIOCGMIIPHY on 'eth0' failed: Operation not supported



[root at xentwo ~]# cat /etc/issue
CentOS release 5.5 (Final)
Kernel \r on an \m

[root at xentwo ~]# uname -a
Linux xentwo 2.6.18-194.32.1.el5xen #1 SMP Wed Jan 5 19:32:33 EST 2011 i686
i686 i386 GNU/Linux


[root at xentwo ~]# dmesg | grep eth0
eth0: Tigon3 [partno(BCM95704A6) rev 2002 PHY(5704)] (PCIX:133MHz:64-bit)
10/100/1000Base-T Ethernet 00:11:43:59:7c:ed
eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[1] TSOcap[1]
eth0: dma_rwctrl[769f4000] dma_mask[64-bit]
ADDRCONF(NETDEV_UP): eth0: link is not ready
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
eth0: no IPv6 routers present
ADDRCONF(NETDEV_UP): peth0: link is not ready
tg3: peth0: Link is up at 100 Mbps, half duplex.
tg3: peth0: Flow control is off for TX and off for RX.
ADDRCONF(NETDEV_CHANGE): peth0: link becomes ready
device peth0 entered promiscuous mode
xenbr0: port 2(peth0) entering forwarding state
eth0: no IPv6 routers present


[root at xentwo ~]# dmidecode | grep -i ether
        Type: Ethernet
        Description: Broadcom Gigabit Ethernet 1
        Type: Ethernet
        Description: Broadcom Gigabit Ethernet 2




[root at xentwo ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:11:43:59:7C:ED
          inet addr:192.168.30.124  Bcast:192.168.30.255  Mask:255.255.255.0
          inet6 addr: fe80::211:43ff:fe59:7ced/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:136658 errors:0 dropped:0 overruns:0 frame:0
          TX packets:512 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:43152822 (41.1 MiB)  TX bytes:75457 (73.6 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1522 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1522 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4285636 (4.0 MiB)  TX bytes:4285636 (4.0 MiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:137243 errors:0 dropped:0 overruns:0 frame:0
          TX packets:511 errors:0 dropped:0 overruns:0 carrier:0
          collisions:3 txqueuelen:1000
          RX bytes:43740268 (41.7 MiB)  TX bytes:76133 (74.3 KiB)
          Interrupt:18 Memory:fcf30000-fcf40000

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:514 errors:0 dropped:0 overruns:0 frame:0
          TX packets:136671 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:75781 (74.0 KiB)  TX bytes:43153860 (41.1 MiB)

virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:7967 (7.7 KiB)

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:135062 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:40981075 (39.0 MiB)  TX bytes:0 (0.0 b)


Regards,
Sikkandar
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