6. Network

6. Network
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6.1. netstat

netstat 監控TCP狀態

#netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}’

狀態：		描述
CLOSED：		無連接是活動的或正在進行
LISTEN：		伺服器在等待進入呼叫
SYN_RECV：	一個連接請求已經到達，等待確認
SYN_SENT：	應用已經開始，打開一個連接
ESTABLISHED：正常數據傳輸狀態
FIN_WAIT1：	應用說它已經完成
FIN_WAIT2：	另一邊已同意釋放
ITMED_WAIT：等待所有分組死掉
CLOSING：	兩邊同時嘗試關閉
TIME_WAIT：	另一邊已初始化一個釋放
LAST_ACK：	等待所有分組死掉

6.2. ss

# ss
State      Recv-Q Send-Q      Local Address:Port          Peer Address:Port
CLOSE-WAIT 1      0           192.168.3.124:19644       130.75.116.209:http
CLOSE-WAIT 1      0           192.168.3.124:31289       170.224.194.69:https
CLOSE-WAIT 1      0           192.168.3.124:64903         198.20.8.241:https
CLOSE-WAIT 1      0           192.168.3.124:64902         198.20.8.241:https
CLOSE-WAIT 1      0           192.168.3.124:27528      170.224.160.205:https
CLOSE-WAIT 1      0           192.168.3.124:10152         198.20.8.241:https
CLOSE-WAIT 1      0           192.168.3.124:18263       170.224.194.69:http
CLOSE-WAIT 1      0           192.168.3.124:18262       170.224.194.69:http
CLOSE-WAIT 1      0           192.168.3.124:27792         129.89.61.70:http
CLOSE-WAIT 1      0           192.168.3.124:27595         129.89.61.70:http
CLOSE-WAIT 1      0           192.168.3.124:28970         129.89.61.70:http
CLOSE-WAIT 1      0           192.168.3.124:28158       130.75.116.210:http
CLOSE-WAIT 1      0           192.168.3.124:26186       130.75.116.210:http
CLOSE-WAIT 1      0           192.168.3.124:26185       130.75.116.210:http
CLOSE-WAIT 1      0           192.168.3.124:42563         74.125.71.99:http
CLOSE-WAIT 1      0           192.168.3.124:42564         74.125.71.99:http
CLOSE-WAIT 1      0           192.168.3.124:63459       130.75.116.202:http
CLOSE-WAIT 1      0           192.168.3.124:63458       130.75.116.202:http
ESTAB      0      0           192.168.3.124:30829         192.168.3.17:3260
ESTAB      0      0           192.168.3.124:13234         192.168.3.15:3260
ESTAB      0      0        ::ffff:192.168.3.124:ssh        ::ffff:192.168.80.5:5                                                                                        2682
ESTAB      0      1960     ::ffff:192.168.3.124:ssh        ::ffff:192.168.80.5:5                                                                                        2957


$ ss
State      Recv-Q Send-Q                Local Address:Port                    Peer Address:Port
ESTAB      0      0                      192.168.80.1:38281                     64.4.61.72:1863
ESTAB      0      0                      192.168.80.1:54504                  112.95.240.77:8000
ESTAB      0      0                      192.168.80.1:14698                  74.125.71.125:5222
ESTAB      0      0                      192.168.80.1:14697                  74.125.71.125:5222
ESTAB      0      0                      192.168.80.1:54123                   64.12.28.171:https
ESTAB      0      0                      192.168.80.1:4225                     64.4.61.171:1863
ESTAB      0      0                      192.168.80.1:ssh                     192.168.80.5:51291
ESTAB      0      0               ::ffff:192.168.80.1:microsoft-ds          ::ffff:192.168.80.5:51094
ESTAB      0      0                      192.168.80.1:22074                  205.188.1.241:https
ESTAB      0      0                      192.168.80.1:59340                    64.4.34.213:1863
ESTAB      0      0                      192.168.80.1:9766                   91.189.89.114:https
ESTAB      0      0                      192.168.80.1:3300                      64.4.44.78:1863

6.3. iftop - display bandwidth usage on an interface by host

# yum install -y iftop

6.4. iptraf - Interactive Colorful IP LAN Monitor

[root@development ~]# yum -y install iptraf

6.5. nload: Console application which monitors network traffic and bandwidth

CentOS

# yum install nload -y

Ubuntu

# sudo apt-get install nload

運行監控命令

# nload

Device eth0 [172.16.3.90] (1/5):
=============================================================================
Incoming:

                                                     Curr: 10.00 kBit/s
                                                     Avg: 103.95 kBit/s
                                                     Min: 0.00 Bit/s
             ||                                      Max: 3.23 MBit/s
             ##                                      Ttl: 1090.93 GByte
Outgoing:

                                                     Curr: 12.84 kBit/s
                                                     Avg: 15.29 kBit/s
                                                     Min: 0.00 Bit/s
                                                     Max: 206.63 kBit/s
                                                     Ttl: 48.57 GByte

6.6. bwm - Bandwidth Monitor

Bandwidth Monitor 1.1.0

       Iface        RX(KB/sec)   TX(KB/sec)   Total(KB/sec)

          lo            8.366        8.366          16.732
        eth0           24.120      100.005         124.125
        eth1            0.000        0.000           0.000

       Total           32.486      108.371         140.857

Hit CTRL-C to end this madness.

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