Centos5.1 is installed on the network. A single network card cannot be installed normally.

Fault symptom

Centos5.1 is installed on the network. If you use only one Nic to boot and download the installation file, it will be disconnected. You must use another Nic to continue the installation.

Processing Process:

Conclusion:
By
The PXE Pilot installation requires two IP addresses. First, explain why the two IP addresses are obtained. This is because PXE obtains the Kernel used for installation and installation.ProgramAnd the installer needs to obtain
Install the Binary Package and configuration file required by the system. Due to the different content they need, the PXE module and Installer are relatively independent, and the PXE network configuration cannot be passed to the installer. Therefore
IP address acquisition process.
For specific fault performance, if you only use the eth0 Nic for guidance, you can only obtain the first IP address, and the installation cannot be completed normally. If you only use eth1, you can get it twice.
And can be installed. If both NICs are used at the same time, you need to manually select eth1 when applying for the second IP address, or specify to get from eth1 in the default configuration file of TFTP
IP address.

It is initially suspected that the two NICs have different EEPROM values.
Temporary solution: 1. Use only the eth1 Nic to boot and install the system. 2. When two NICs are used at the same time, ksdevice = eth1 must be added after the first append of the default file to specify to obtain the IP address from the eth1 Nic.