The specified IP address cannot access the Internet.

The specified IP address cannot access the Internet-Linux Enterprise Application-Linux server application information. For more information, see. Environment and Symptom description:

After a machine in the LAN is reinstalled, it cannot access the Internet.

The IP address is manually set to 192.168.1.2, so that all Intranet traffic is smooth and the gateway can be accessed normally. The public IP address of the router cannot be pinged. If it is set to another IP address or DHCP address, everything works normally. No problem with Intranet and Internet.

Environment: Use iptables as a firewall to enable NAT access to the public network for all internal machines.

After all the problems are ruled out, the system finally locates Iptables and runs "# iptables-t nat-L-n". The following record is found:

Chain POSTROUTING (policy ACCEPT)
Target prot opt source destination
SNAT 0 -- 192.168.1.2 0.0.0.0/0 to: 116 .*.*.*

This is very strange. I am not very familiar with iptables. At that time, the purpose of this command should be to set all public IP addresses to 116. *. *. * The access is redirected to 192.168.1.2. In addition, because the network on debian is set as a temporary setting, 116 after the restart. *. *. 9. This address is lost. Then 192.168.1.2 won't be able to access the Internet. If possible, run the following command:

# Ifconfig eth0: 123 116. * netmask implements 255.255.255.248, and then test the machine 192.168.1.2. Everything is normal

After verification, it should be the following command:

Iptables-t nat-I POSTROUTING-s 192.168.1.2-j SNAT -- to 116. * iptables

Really good and powerful.