centos 网卡信息(centos查看网卡连接状态)
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linux/centos如何查看网卡是100M还是1000M
可以使用ethtool命令进行查看，使用格式ethtool网络接口名。
以下为例，eth0为网卡名，使用ifconfig查看当前使用的网卡。
Speed表示网卡带宽，Duplex表示工作模式，Supportedlinkmodes表示支持的工作模式。
扩展资料：
ethtool命令的其它用法：
1、查询网络端口位置：ethtool-pethX
这个命令多用于管理多网口的服务器主机，由于背板的网络端口数量大，有时候不知道那个物理端口对应eth0或其他设备号，我们就可以使用这个命令来查询。
用法：ethtool-peth0
效果：设备号eth0对应的物理端口的两个指示灯会闪烁
2、修改网络端口速率：ethtool-s
这个命令多用于手工设置网络速率，一般千兆网卡支持10|100|1000三个速率，单位是Mbps。
用法：ethtool-seth0speed1000duplexfullautonegoff
效果：将设备号eth0对应的物理端口设置为速率为1000Mbps，全双工工作模式，同时关闭自动协商。
Centos7下删除virbr0网卡信息的方法
说明：之前在CentOS7下配置过bridge，现在讲bridge模式改为普通模式后，查看网卡的时候还是可以看到很多垃圾信息，想彻底删除自己不想要的网卡配置信息，操作如下:
[root@linux-node1~]# ip add list1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6::1/128 scope host valid_lft forever preferred_lft forever2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:9b:7d:d6 brd ff:ff:ff:ff:ff:ff inet 10.10.10.11/24 brd 10.10.10.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe9b:7dd6/64 scope link valid_lft forever preferred_lft forever4: virbr0: mtu 1500 qdisc noqueue state DOWN qlen 1000 link/ether 52:54:00:f4:24:05 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever5: virbr0-nic: mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000 link/ether 52:54:00:f4:24:05 brd ff:ff:ff:ff:ff:ff
查看网络列表：
[root@linux-node1~]# virsh net-list Name State Autostart Persistent---------------------------------------------------------- default active yes yes
使用“virsh net-destroy default”删除
[root@linux-node1~]# virsh net-destroy defaultNetwork default destroyed
从配置文件中剔除
[root@linux-node1~]# virsh net-undefine defaultNetwork default has been undefined
重启libvirtd服务
[root@linux-node1~]# systemctl restart libvirtd.service[root@linux-node1~]# virsh net-list Name State Autostart Persistent----------------------------------------------------------[root@linux-node1~]# ip add list1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6::1/128 scope host valid_lft forever preferred_lft forever2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:9b:7d:d6 brd ff:ff:ff:ff:ff:ff inet 10.10.10.11/24 brd 10.10.10.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe9b:7dd6/64 scope link valid_lft forever preferred_lft forever
再次查看，发现不必要的信息已经清除，清爽多了
电脑新装系统配置怎么看centos7查看网卡信息及数量
环境：Centos 7.5
VMware 16.0.0
问题描述：
CentOS7.5新装系统如何查看网络，配置网卡信息
解决方案：
1.查看ip信息
ip a
ip a1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6::1/128 scope host valid_lft forever preferred_lft forever2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:50:56:25:19:1c brd ff:ff:ff:ff:ff:ff inet 192.168.1.227/24 brd 192.168.1.255 scope global noprefixroute ens33 valid_lft forever preferred_lft forever inet6 fe80::36fd:c3d4:ea0a:5ab4/64 scope link noprefixroute valid_lft forever preferred_lft forever2.查看编辑网卡信息
vim/etc/sysconfig/network-scripts/ifcfg-ens33（网卡名）
TYPE=EthernetPROXY_METHOD=noneBROWSER_ONLY=noBOOTPROTO=noneDEFROUTE=yesIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_FAILURE_FATAL=noIPV6_ADDR_GEN_MODE=stable-privacyNAME=ens33UUID=bf5bb7c5-da27-44a9-b4be-7f6e4138abfdDEVICE=ens33ONBOOT=yesIPADDR=192.168.1.227PREFIX=24GATEWAY=192.168.1.1重启网络服务
systemctl restart network
查看ens33网卡信息
ifconfig ens33
ens33: flags=4163 mtu 1500 inet 192.168.1.227 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::36fd:c3d4:ea0a:5ab4 prefixlen 64 scopeid 0x20 ether 00:50:56:25:19:1c txqueuelen 1000(Ethernet) RX packets 29155875 bytes 2426699185(2.2 GiB) RX errors 0 dropped 108161 overruns 0 frame 0 TX packets 32605674 bytes 12952561612(12.0 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0启用ens33网卡
ifconfig ens33 up
禁用ens33网卡
ifconfig ens33 down
查看ens33网卡其他参数
ethtool ens33
Settings for ens33:Supported ports: [ TP ]Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: NoSupports auto-negotiation: YesSupported FEC modes: Not reportedAdvertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: NoAdvertised auto-negotiation: YesAdvertised FEC modes: Not reportedSpeed: 1000Mb/sDuplex: FullPort: Twisted PairPHYAD: 0Transceiver: internalAuto-negotiation: onMDI-X: off(auto)Supports Wake-on: dWake-on: dCurrent message level: 0x00000007(7) drv probe linkLink detected: yesDNS设置
vim/etc/resolv.conf
nameserver 192.168.1.1关闭NetworkManager服务
systemctl stop NetworkManager.service停止开机自启
systemctl disable NetworkManager.service查看网络服务
systemctl status network.service
● network.service- LSB: Bring up/down networking Loaded: loaded(/etc/rc.d/init.d/network; bad; vendor preset: disabled) Active: active(running) since四 2022-03-17 23:58:09 CST; 7h left Docs: man:systemd-sysv-generator(8) Process: 975 ExecStart=/etc/rc.d/init.d/network start(code=exited, status=0/SUCCESS) CGroup:/system.slice/network.service└─1304/sbin/dhclient-1-q-lf/var/lib/dhclient/dhclient-f5774ec4-da78-4594-859b-a17bb015e929-ens33.lease-pf/var/run/dhclient-ens33.pid ens333月 17 23:58:06 localhost.localdomain network[975]:正在打开环回接口： [确定 ]3月 17 23:58:07 localhost.localdomain network[975]:正在打开接口 ens33：3月 17 23:58:07 localhost.localdomain dhclient[1193]: DHCPREQUEST on ens33 to 255.255.255.255 port 67(xid=0x2c76a023)3月 17 23:58:07 localhost.localdomain dhclient[1193]: DHCPACK from 192.168.1.1(xid=0x2c76a023)3月 17 23:58:09 localhost.localdomain NET[1300]:/usr/sbin/dhclient-script: updated/etc/resolv.conf3月 17 23:58:09 localhost.localdomain dhclient[1193]: bound to 192.168.1.227-- renewal in 10429 seconds.3月 17 23:58:09 localhost.localdomain network[975]:正在确定 ens33的 IP信息...完成。3月 17 23:58:09 localhost.localdomain NET[1350]:/etc/sysconfig/network-scripts/ifup-post: updated/etc/resolv.conf3月 17 23:58:09 localhost.localdomain network[975]: [确定 ]3月 17 23:58:09 localhost.localdomain systemd[1]: Started LSB: Bring up/down networking.查看网络服务日志
cat/var/log/messages| grep network
ar 17 23:53:00 localhost systemd: Started LSB: Bring up/down networking.Mar 17 23:54:11 localhost systemd: Stopping LSB: Bring up/down networking...Mar 17 23:54:12 localhost NET[3314]:/etc/sysconfig/network-scripts/ifdown-post: updated/etc/resolv.confMar 17 23:54:12 localhost network:正在关闭接口 ens33： [确定 ]Mar 17 23:54:12 localhost network:正在关闭环回接口： [确定 ]Mar 17 23:54:12 localhost systemd: Starting LSB: Bring up/down networking...Mar 17 23:54:12 localhost NET[3516]:/etc/sysconfig/network-scripts/ifup-post: updated
