centos/redhat服务器的的网络配置主要在 /etc/sysconfig/network-scripts/ifcfg-xxx
至于是 ifcfg-xxx是那个需要查看系统安装时的配置，如果未知，可以执行ifconfig，查看inet ip为你已知的节点的ip前的端口名称，
xxx01:~ # ifconfig
eth0 Link encap:Ethernet HWaddr 52:54:00:87:DB:AE
inet addr:172.27.129.217 Bcast:172.27.143.255 Mask:255.255.240.0
inet6 addr: fe80::5054:ff:fe87:dbae/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:117789846 errors:0 dropped:109125 overruns:0 frame:0
TX packets:63451802 errors:0 dropped:0 overruns:0 carrier:0
collisions:282650359 txqueuelen:1000
RX bytes:71185182214 (67887.4 Mb) TX bytes:33331745785 (31787.6 Mb)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:24576327 errors:0 dropped:0 overruns:0 frame:0
TX packets:24576327 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:14827347085 (14140.4 Mb) TX bytes:14827347085 (14140.4 Mb)
以eth0为例，查看该网卡设备的带宽 ethtool eth0
xxx01:~ # ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes查看关键字speed：得知该服务器的网口带宽是100Mb/s