本文介紹於VMware ESXi 5.x及ESXi／ESX 4.x環境，Virtual Machine執行Clone作業，來源映像檔若為RHEL 6，則後續建立的Virtual Machine之網路無法正常使用問題及其解決方案
[Lab Information]
本文使用VMware ESXi 5.0進行實作，其Virtual Machine（以下簡稱VM）相關資訊如下：
<u>Source VM Information:</u>
VM Name: <span style="color: blue;">splunk_192.168.0.101</span>
OS: <span style="color: blue;">Rat Hat Enterprise Linux 6.2 64 bit</span>
Linux Kernel: <span style="color: blue;">2.6.32</span>
IP Address: <span style="color: blue;">192.168.0.101</span>
Network Adapter MAC: <span style="color: blue;">00:50:56:b0:71:0e</span>

<u>Target VM Information:</u>
VM Name: <span style="color: blue;">splunk_192.168.0.102</span>
OS: <span style="color: blue;">Rat Hat Enterprise Linux 6.2 64 bit</span>
Linux Kernel: <span style="color: blue;">2.6.32</span>
IP Address: <span style="color: blue;">192.168.0.102</span>
Network Adapter MAC: <span style="color: blue;">00:50:56:b0:71:1b</span>

[Check Target VM Status]
當Clone作業執行完畢後，使用帳號：root登入Target VM進行下列步驟：

1. 檢視檔案：/etc/sysconfig/network-scripts/ifcfg-eth0狀態

   ls -l /etc/sysconfig/network-scripts/ifcfg-eth*
   cat /etc/sysconfig/network-scripts/ifcfg-eth0

發現檔案內容仍為Source VM的網路設定資訊，如下圖示：

2. 檢視檔案：/etc/udev/rules.d/70-persistent-net.rules狀態，如下圖示：

cat /etc/udev/rules.d/70-persistent-net.rules

[Modify The Kernel’s Networking Interface]
編輯檔案：/etc/udev/rules.d/70-persistent-net.rules，可參照下列設定：

vi /etc/udev/rules.d/70-persistent-net.rules
'# Mark or Delete line of NAME="eth0" #'
# PCI device 0x15ad:0x07b0 (vmxnet3)
#SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:b0:71:0e", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

'# Change NAME="eth1" to NAME="eth0" #'
# PCI device 0x15ad:0x07b0 (vmxnet3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:b0:71:1b", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

[Modify Network Interface Configuration File]
編輯檔案：/etc/sysconfig/network-scripts/ifcfg-eth0，可參照下列設定：

vi /etc/sysconfig/network-scripts/ifcfg-eth0
'# Modify "HWADDR" parameter to Target VM Network Adapter MAC #'
HWADDR=00:50:56:B0:71:1B
'# Modify "IPADDR" parameter to Target VM IP #'
IPADDR=192.168.0.102
'# Mark or Delete "UUID" parameter #'
#UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03

[Restart Target VM]
透過reboot command重新開機，網卡狀態即可正常使用

reboot

[Reference]
Fix eth0 network interface when cloning RedHat, CentOS or Scientific virtual machines using Oracle VirtualBox or VMWare