Linux network bottom-level related knowledge reserve

1: Does the system recognize the NIC

650) this.width=650; "style=" width:668px;height:66px; "title=" 111.jpg "src=" http://s3.51cto.com/wyfs02/M02/4A/19/ Wkiom1qih4cxwznoaads-82ztjq362.jpg "width=" 663 "height=", alt= "Wkiom1qih4cxwznoaads-82ztjq362.jpg"/>

2: Install the driver to load the corresponding module

Use lsmod modprobe mate to modify/etc/modprobe.conf

[Email protected] ~]# Modprobe-l | grep 8139
/lib/modules/2.6.18-238.el5pae/kernel/drivers/net/8139cp.ko
/lib/modules/2.6.18-238.el5pae/kernel/drivers/net/8139too.ko

The driver will be stored in the /lib/modules/<kernel_version>/kernel/drivers/net/*.ko file after normal installation.

3: Set up the network card configuration file

[Email protected] ~]# cd/etc/sysconfig/network-scripts/

Establish Ifcfg-eth0

Device=eth0
Bootproto=static
Hwaddr=c8:1f:66:20:82:ef
ipaddr=192.168.6.2
netmask=255.255.255.0
gateway=192.168.6.1
Onboot=yes

4: Start Nic ifconfig eth0 up

5: Route add route add default GW 192.168.6.1

or IP route add default via 192.168.6.1 dev eth0

6: See if the relevant routing rules are Normal

[[Email protected] ~]# IP rule Default Routing table has 3, the actual use of the main table
0:from All Lookup 255
32766:from All lookup Main
32767:from All Lookup Default

About the network card problems, such as link layer judgment fault-related commands:

Determine the network cable Connection status:

[Email protected] ~]# Mii-tool
eth0:negotiated 100basetx-fd, link ok

Or

[[Email protected] ~]# IP link
1:lo: <LOOPBACK,UP,LOWER_UP> MTU 16436 Qdisc noqueue
Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00
2:eth0: <broadcast,multicast,up,lower_up> MTU qdisc pfifo_fast qlen 1000
Link/ether 00:1F:D0:D3:65:BB BRD FF:FF:FF:FF:FF:FF

Linux network bottom-level related knowledge reserve