Hi, Thanks for response my email. I am sorry that I did not post enough infomation for my question. Please see the following: The Firewall is off The network card appears to have been detected (3c900), but it would not transmit(The ping command fails). ifconfig output related to eth0 is the following: eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx inet addr:192.168.xxx.xxx Bcast:192.168.xxx.xxx Mask:255.255.255.0 inet6 addr: xxxx::xxx:xxx:xxxx:xxx/xx Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1 errors:4 dropped:0 overruns:0 frame:0 TX packets:0 errors:15 dropped:0 overruns:17 carrier:17 collisions:0 txqueuelen:1000 RX bytes:21823 (21.3 Kb) TX bytes:0 (0.0 b) Interrupt:10 Base address:0xb000 The line in /etc/modprobe.conf for eth0 is the following: alias eth0 3c59x I invoked "/sbin/lspci" and got the following info related to eth0: 00:09.0 Ethernet controller: 3Com Corporation 3c900 10Mbps Combo [Boomerang] I invoked "grep -i eth0 /var/log/messages" and got the following info related to eth0: : : /var/log/messages:Sep 14 08:59:06 xxxxx kernel: NETDEV WATCHDOG: eth0: transmit timed out /var/log/messages:Sep 14 08:59:06 xxxxx kernel: eth0: transmit timed out, tx_status 00 status e000. /var/log/messages:Sep 14 08:59:06 xxxxx kernel: eth0: Transmit error, Tx status register 90. : : I invoked "dmesg | grep -i eth0" and got the following info related to eth0: : : NETDEV WATCHDOG: eth0: transmit timed out eth0: transmit timed out, tx_status 00 status e000. eth0: Resetting the Tx ring pointer. eth0: Transmit error, Tx status register 90. : : Shi-Ping Chen