yum install net-tools
scp -r /home/data/xl_tmp/* root@192.168.2.51:/home/data/xl_tmp/
[root@hadoop1 ~]# ifconfig
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.50 netmask 255.255.255.0 broadcast 192.168.2.255
inet6 fe80::a6bf:1ff:fe38:87e4 prefixlen 64 scopeid 0x20<link>
ether a4:bf:01:38:87:e4 txqueuelen 1000 (Ethernet)
RX packets 549401887 bytes 175359059861 (163.3 GiB)
RX errors 0 dropped 12398 overruns 0 frame 0
TX packets 541041732 bytes 285797506976 (266.1 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0xb1200000-b127ffff
eno2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether a4:bf:01:38:87:e5 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 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
device memory 0xb1100000-b117ffff
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 23783784 bytes 19562119550 (18.2 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 23783784 bytes 19562119550 (18.2 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@hadoop1 ~]# netstat -n | grep 192.168.2.51
tcp 0 0 192.168.2.50:35986 192.168.2.51:22 ESTABLISHED
[root@hadoop1 ~]#
[root@hadoop1 conf]# ifconfig
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.51 netmask 255.255.255.0 broadcast 192.168.2.255
inet6 fe80::a6bf:1ff:fe38:874e prefixlen 64 scopeid 0x20<link>
ether a4:bf:01:38:87:4e txqueuelen 1000 (Ethernet)
RX packets 269295218 bytes 298542167826 (278.0 GiB)
RX errors 0 dropped 10609 overruns 0 frame 0
TX packets 206849742 bytes 56847723549 (52.9 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0xb1200000-b127ffff
eno2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether a4:bf:01:38:87:4f txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 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
device memory 0xb1100000-b117ffff
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 95544519 bytes 36666033920 (34.1 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 95544519 bytes 36666033920 (34.1 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@hadoop1 conf]# netstat -n | grep 192.168.2.50
tcp 0 72 192.168.2.51:22 192.168.2.50:35986 ESTABLISHED
[root@hadoop1 conf]#
iftop
http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858923.html
现象：接口响应时间突然异常大于1秒；top查看，存在突然出现的非常规网络通信进程，排查通信的另一方。