Check and troubleshoot common Linux Network Problems

1. Nic is not working properly

1) Use the lsmod command to determine whether the NIC is loaded

# Lsmod

2) if not loaded, use the dmesg command to determine whether hardware is detected.

# Dmesg

3) Use ifconfig to determine whether the network settings are normal

2. DNS settings

View the/etc/resolv. conf file to check DNS Configuration

3. Default route settings

Use the route command to view the route table

# Route

If the route settings are incorrect, modify the settings as follows:

# Route del default

# Route add default GW 192.168.0.254

4. One Nic is bound to multiple IP addresses

Run the following command:

# Ifconfig eth0: 0 192.168.0.253

# Ifconfig eth0: 1 192.168.0.252

 

If you want to automatically bind the command when the system starts, you can write these commands to the/etc/rc. d/rc. Local script.

Or

In the/etc/sysconfig/network-scripts/directory, copy the ifcfg-eth0 to ifcfg-eth0: 0, ifcfg-eth0: 1, and make the following changes:

Device = eth0: 0 [1]

Ipaddr = 192.168.0.253 [1, 252]