RHEL 7 came with new feature called “consistent network device naming“.This feature change the name of network interfaces on a system in order to make locating and differentiating the interfaces easier.
Traditionally, network interfaces in Linux are enumerated as
eth[0123…], but these names do not necessarily correspond to actual labels on the chassis. Modern server platforms with multiple network adapters can encounter non-deterministic and counter-intuitive naming of these interfaces. This affects both network adapters embedded on the motherboard (Lan-on-Motherboard, or LOM) and add-in (single and multiport) adapters.Let show you how to Change default network name (ens33) to “eth0” in Centos7 or RHEL7
The below procedure disables “consistent network device naming” and renames interfaces.
The default config is like this :
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and Should be changed to: add the string bellow the the config
net.ifnames=0 biosdevname=0
test the new configuration to see if no mistake has been made:
Run first : grub2-mkconfig to see if no mistake has been made
[root@osradar-com ~]# grub2-mkconfig
Then
[root@osradar-com ~]# grub2-mkconfig -o /boot/grub2/grub.cfg Generating grub configuration file ... Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img Found linux image: /boot/vmlinuz-0-rescue-5a816247fa35410a9ee4234442a188c0 Found initrd image: /boot/initramfs-0-rescue-5a816247fa35410a9ee4234442a188c0.img done
Copy the old configuraton
cp /etc/sysconfig/network-scripts/ifcfg-ens33 /etc/sysconfig/network-scripts/ifcfg-eth0
edit /etc/sysconfig/network-scripts/ifcfg-eth0 to
TYPE="Ethernet" PROXY_METHOD="none" BROWSER_ONLY="no" BOOTPROTO="dhcp" DEFROUTE="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF="yes" IPV6_DEFROUTE="yes" IPV6_FAILURE_FATAL="no" IPV6_ADDR_GEN_MODE="stable-privacy" NAME="eth0" UUID="84cad80a-0c42-4540-90c6-9209735e8ea8" DEVICE="eth0" ONBOOT="yes"
save and exit
Reboot the machine
shutdown -r now
Ping form Another machione
#:\>ping 192.168.65.132 Pinging 192.168.65.132 with 32 bytes of data: Reply from 192.168.65.132: bytes=32 time=1ms TTL=64 Reply from 192.168.65.132: bytes=32 time=4ms TTL=64 Reply from 192.168.65.132: bytes=32 time=4ms TTL=64 Ping statistics for 192.168.65.132: Packets: Sent = 3, Received = 3, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 4ms, Average = 3ms
Enjoy
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In the RHEL official page says: “Do not disable consistent network device naming because it allows the system using ethX style names, where X is a unique number corresponding to a specific interface and may have different names of network interfaces during the boot process.”
Are you sure about your tutorial? Please your help.
Thanks in advance.
Regards
Jose Cruz
hello
I did all of these commands but interface name doesnt change.please help me.
Cent OS 7 & Kernel 3.10.0-862
Hello Mel,
After searching many tutorials I found your instructions to be the best. Thank you for the tutorial.
Best Regards,
Randy