Customizing network card and changing interface of network card in Linux system

Time:2021-4-28

This document details how to add a custom network card to rhel7 and change the interface of the network card
environment
VMware Workstation Pro
Red Hat Enterprise Linux Server release 7.3

View the current network card information
[[email protected] ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)
[[email protected] ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    inet 192.168.10.11  netmask 255.255.255.0  broadcast 192.168.10.255
    inet6 fe80::250:56ff:fe2b:88bf  prefixlen 64  scopeid 0x20
    ether 00:50:56:2b:88:bf  txqueuelen 1000  (Ethernet)
    RX packets 454  bytes 44638 (43.5 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 339  bytes 33150 (32.3 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10
    loop  txqueuelen 1  (Local Loopback)
    RX packets 112  bytes 9492 (9.2 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 112  bytes 9492 (9.2 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

add adapter
Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Cancel the hook in the red box
Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

Add a custom NIC to rhel7 and change the NIC interface. Add a custom NIC to rhel7 and change the NIC interface

View network card information
[[email protected] ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    inet 192.168.10.11  netmask 255.255.255.0  broadcast 192.168.10.255
    inet6 fe80::250:56ff:fe2b:88bf  prefixlen 64  scopeid 0x20
    ether 00:50:56:2b:88:bf  txqueuelen 1000  (Ethernet)
    RX packets 488  bytes 47935 (46.8 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 356  bytes 35698 (34.8 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens38: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    ether 00:0c:29:46:f9:b8  txqueuelen 1000  (Ethernet)
    RX packets 5  bytes 594 (594.0 B)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 0  bytes 0 (0.0 B)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10
    loop  txqueuelen 1  (Local Loopback)
    RX packets 112  bytes 9492 (9.2 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 112  bytes 9492 (9.2 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Configure NIC and change NIC interface
[[email protected] ~]# cd /etc/sysconfig/network-scripts/
[[email protected] network-scripts]# ls
ifcfg-ens33 ifdown-ipv6 ifdown-TeamPort ifup-ippp ifup-routes network-functions
ifcfg-lo ifdown-isdn ifdown-tunnel ifup-ipv6 ifup-sit network-functions-ipv6
ifdown ifdown-post ifup ifup-isdn ifup-Team
ifdown-bnep ifdown-ppp ifup-aliases ifup-plip ifup-TeamPort
ifdown-eth ifdown-routes ifup-bnep ifup-plusb ifup-tunnel
ifdown-ib ifdown-sit ifup-eth ifup-post ifup-wireless
ifdown-ippp ifdown-Team ifup-ib ifup-ppp init.ipv6-global
After adding the network card, you need to create the corresponding network card configuration file
[[email protected] network-scripts]# cp ifcfg-ens33 ifcfg-ens34
[[email protected] network-scripts]# vim ifcfg-ens34
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
NAME=ens34
DEVICE=ens34
ONBOOT=yes
IPADDR=172.16.100.100
NETMASK=255.255.255.0
Disable the ens38 interface
[[email protected] network-scripts]# ip link set ens38 down
[[email protected] network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    inet 192.168.10.11  netmask 255.255.255.0  broadcast 192.168.10.255
    inet6 fe80::250:56ff:fe2b:88bf  prefixlen 64  scopeid 0x20
    ether 00:50:56:2b:88:bf  txqueuelen 1000  (Ethernet)
    RX packets 812  bytes 74791 (73.0 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 537  bytes 61780 (60.3 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10
    loop  txqueuelen 1  (Local Loopback)
    RX packets 112  bytes 9492 (9.2 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 112  bytes 9492 (9.2 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Rename the ens38 interface to ens34
[[email protected] network-scripts]# ip link set ens38 name ens34
Enable modified ens34 interface
[[email protected] network-scripts]# ip link set ens34 up

[[email protected] network-scripts]# systemctl restart network
[[email protected] network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    inet 192.168.10.11  netmask 255.255.255.0  broadcast 192.168.10.255
    inet6 fe80::250:56ff:fe2b:88bf  prefixlen 64  scopeid 0x20
    ether 00:50:56:2b:88:bf  txqueuelen 1000  (Ethernet)
    RX packets 1389  bytes 123239 (120.3 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 913  bytes 117924 (115.1 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

    inet 172.16.100.100  netmask 255.255.255.0  broadcast 192.168.100.255
    ether 00:0c:29:46:f9:b8  txqueuelen 1000  (Ethernet)
    RX packets 5  bytes 594 (594.0 B)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 2  bytes 120 (120.0 B)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10
    loop  txqueuelen 1  (Local Loopback)
    RX packets 148  bytes 12552 (12.2 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 148  bytes 12552 (12.2 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

summary
The above is to rhel7 add a custom network card and change the network card interface method, hope to help you!