查看linux是不是万兆网的方法：1、通过ethtool和lspci命令查看网卡是千兆还是万兆网卡；2、通过ifconfig命令查看机器网络端口，然后执行“sudo ethtool eno1”命令查看网络带宽是千兆还是万兆即可。
本教程操作环境：linux5.9.8系统、Dell G3电脑。
怎么查看linux是不是万兆网？
Linux查看网卡是千兆还是万兆网卡
目前用过的两个命令：
1、ethtool
ethtool 网络接口名
#ethtool em4Settings for em4:Supported ports: [ TP ]Supported link modes: 10baseT/Half 10baseT/Full100baseT/Half 100baseT/Full1000baseT/FullSupports auto-negotiation: YesAdvertised link modes: 10baseT/Half 10baseT/Full100baseT/Half 100baseT/Full1000baseT/FullAdvertised pause frame use: NoAdvertised auto-negotiation: YesSpeed: 1000Mb/sDuplex: FullPort: Twisted PairPHYAD: 1Transceiver: internalAuto-negotiation: onMDI-X: UnknownSupports Wake-on: gWake-on: dLink detected: yes
2、lspci
当前是博通BCM5709千兆网卡Gigabit（万兆网卡显示为10-Gigabit）
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#lspci -vvv | grep Ethernet01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 GigabitEthernet (rev 20)Subsystem: Dell PowerEdge R710 BCM5709 Gigabit EthernetProduct Name: Broadcom NetXtreme II Ethernet Controller01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)Subsystem: Dell PowerEdge R710 BCM5709 Gigabit EthernetProduct Name: Broadcom NetXtreme II Ethernet Controller02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)Subsystem: Dell PowerEdge R710 BCM5709 Gigabit EthernetProduct Name: Broadcom NetXtreme II Ethernet Controller02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)Subsystem: Dell PowerEdge R710 BCM5709 Gigabit EthernetProduct Name: Broadcom NetXtreme II Ethernet Controllerpcilib: sysfs_read_vpd: read failed: Connection timed out
小知识：
Gigabit是数据存储的单位，通常用符号Gbit或Gb表示。它的换算公式：1 Gb = 10的9次方 bits = 1,000,000,000 bits 。
另一个常见的单位是Gibibit，gibibit是用来表示二进制换算的，1 gibibit = 2的30次方 bits = 1,073,741,824 bits。
Linux 查看网络带宽是千兆还是万兆
首先查看机器网络端口
[root@namenode ~]# ifconfigeno1: flags=4163 mtu 1500 inet 192.168.60.190 netmask 255.255.255.0 broadcast 192.168.80.255 inet6 fe80::b62e:99ff:fe65:3bd6 prefixlen 64 scopeid 0x20 ether b4:2e:99:65:3b:d6 txqueuelen 1000 (Ethernet) RX packets 1034361639 bytes 496433512301 (462.3 GiB) RX errors 0 dropped 144034 overruns 0 frame 0 TX packets 977985340 bytes 163296216477 (152.0 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xf7200000-f7220000
查看端口带宽(root或sudo权限)，通过下面输出可以看到speed那一行，表示千兆网。
[root@namenode ~]# sudo ethtool eno1Settings for eno1: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: off (auto) Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000007 (7) drv probe link Link detected: yes
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