centos 服务器多网卡 ip 地址设置

https://blog.csdn.net/xh_w20/article/details/141574357

cd /etc/sysconfig/network-scripts/

sudo systemctl status network

● network.service - LSB: Bring up/down networkingLoaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)Active: active (exited) since Mon 2024-09-09 14:05:44 CST; 52s agoDocs: man:systemd-sysv-generator(8)Process: 935 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)Sep 09 14:05:42 localhost.localdomain systemd[1]: Starting LSB: Bring up/down networking...
Sep 09 14:05:43 localhost.localdomain network[935]: Bringing up loopback interface:  [  OK  ]
Sep 09 14:05:44 localhost.localdomain network[935]: Bringing up interface enp3s0:  Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
Sep 09 14:05:44 localhost.localdomain network[935]: [  OK  ]
Sep 09 14:05:44 localhost.localdomain network[935]: Bringing up interface enp4s0:  [  OK  ]
Sep 09 14:05:44 localhost.localdomain systemd[1]: Started LSB: Bring up/down networking.

ifconfig

enp3s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500inet 192.168.99.166  netmask 255.255.255.0  broadcast 192.168.99.255inet6 fe80::6245:2ae4:d24:2be5  prefixlen 64  scopeid 0x20<link>ether 00:e0:b4:1d:88:1c  txqueuelen 1000  (Ethernet)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0device memory 0xd0700000-d071ffff  enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.99.165  netmask 255.255.255.0  broadcast 192.168.99.255inet6 fe80::1920:9a3d:e274:a7a8  prefixlen 64  scopeid 0x20<link>ether 00:e0:b4:1d:88:1d  txqueuelen 1000  (Ethernet)RX packets 585  bytes 72467 (70.7 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 167  bytes 19609 (19.1 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0device memory 0xd0600000-d061ffff  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (Local Loopback)RX packets 68  bytes 5916 (5.7 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 68  bytes 5916 (5.7 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

cat bak_ifcfg-enp3s0

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=enp3s0
UUID=c215c68d-3667-4e8a-b7a1-1835e21212ee
DEVICE=enp3s0
ONBOOT=no

cat ifcfg-enp4s0

TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
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="enp4s0"
UUID="a44b095c-4cc9-4963-8c89-24f256537e64"
DEVICE="enp4s0"
ONBOOT="yes"
IPADDR="192.168.99.165"
PREFIX="24"
GATEWAY="192.168.99.1"
DNS1="192.168.99.1"
DNS2="8.8.8.8"
IPV6_PRIVACY="no"

如果 enp3s0 不插网线， enp4s0 插入网线，两者同时设置为 192.168.99.165 会出现问题。

route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.99.1    0.0.0.0         UG    100    0        0 enp4s0
0.0.0.0         192.168.99.1    0.0.0.0         UG    101    0        0 enp3s0
192.168.99.0    0.0.0.0         255.255.255.0   U     100    0        0 enp4s0
192.168.99.0    0.0.0.0         255.255.255.0   U     101    0        0 enp3s0