Home PC Games Linux Windows Database Network Programming Server Mobile  
           
  Home \ Linux \ Observation network performance tools for Linux     - Java object serialization and deserialization (Programming)

- Python 3.5 await / async (Programming)

- Understand ASP.NET 5 running the command: DNVM, DNX, and DNU (Server)

- AngularJS achieve picture upload feature (Programming)

- J2EE Example of Filter (Programming)

- Difference between TCP and UDP protocols (Linux)

- Linux host system monitoring implement the cgi (Server)

- MongoDB replication instance (Database)

- 5 steps to help you become a good Docker contributors (Linux)

- Linux directory structure (Linux)

- installation of Vim plugin YouCompleteMe under Ubuntu 15.04 (Linux)

- Ubuntu will be written in a command file, executable file, source command (Linux)

- Import and export myloader accelerate mydumper (Database)

- Normal start Lazarus 1.0.8 under Ubuntu (Linux)

- CoreOS quick installation to get started on a PC (Linux)

- Use ldap implement Windows Remote Desktop Ubuntu Linux (Linux)

- Python object-oriented programming (Programming)

- Linux installation JDK1.6 rpm.bin assembly (Linux)

- Linux operating system boot process analysis (Linux)

- Use PXE with kickstart to install Linux automatically (Linux)

 
         
  Observation network performance tools for Linux
     
  Add Date : 2018-11-21      
         
         
         
  Network tools on the Linux system very much, how to choose according to actual needs, said hand tool? In this to make a brief introduction:

Observation of network traffic:
"Sar -n DEV 1 5" can count on the network flow rate of each card:

# Sar -n DEV 2 5
 
...
02:47:12 PM IFACE rxpck / s txpck / s rxkB / s txkB / s rxcmp / s txcmp / s rxmcst / s
02:47:14 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:47:14 PM eth0 2.51 0.00 0.17 0.00 0.00 0.00 0.00
...

ptraf is a powerful tool to observe network flow, it allows you to observe the gradual deepening, from the hardware layer (NIC), the network layer (IPv4, IPv6), to the transport layer (TCP, UDP etc.), until each pair socket pair.
iptraf-d

Observe the state of the network connection:
"Netstat -a"
This is the traditional tool, but it can not handle the massive network connection. So on a host of large-scale network connection, it is recommended to use ss.
 
# netstat -a
Active Internet connections (servers andestablished)
Proto Recv-QSend-QLocal Address Foreign Address State
tcp 0 0 *: mysql *: * LISTEN
tcp 0 0 *: 5901 *: * LISTEN
...
tcp 0 104bj71s060.chn.hp.com:ssh 16.169.16.67:52681 ESTABLISHED

"Ss -a" lists all network connections. ss particularly suitable host massive connection.
If you add "-p" option, you can display the corresponding process ID.

# Ss -a
State Recv-QSend-Q Local Address: Port Peer Address: Port
LISTEN 0 50 *: mysql *: *
LISTEN 0 5 *: 5901 *: *
...
LISTEN 0 128 ::: 38246 ::: *
ESTAB 0 184 16.187.252.58:ssh 16.169.16.67:52681

Observation of static statistics:
"Netstat -i"

# Netstat -i
Kernel Interfacetable
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0572421962 0 0 016831237 0 0 0BMRU
lo 16436 0 556534 0 0 0 556534 0 0 0LRU

ifconfig can see a small card-level statistics, packet number, collision, errors and so on:

# Ifconfig eth0
eth0 Link encap: Ethernet HWaddr00: 19: BB: 5B: 07: 34
          inet addr: 16.187.252.58 Bcast: 16.187.255.255 Mask: 255.255.252.0
          inet6 addr: fe80 :: 219: bbff: fe5b: 734 / 64Scope: Link
          UP BROADCAST RUNNING MULTICAST MTU: 1500 Metric: 1
          RX packets: 572422657errors: 0dropped: 0overruns: 0frame: 0
          TX packets: 16831252errors: 0dropped: 0overruns: 0carrier: 0
          collisions: 0txqueuelen: 1000
          RX bytes: 50512945748 (47.0GiB) TX bytes: 11194760435 (10.4GiB)
          Interrupt: 19Memory: f0500000-f0520000

"Ip -s link" substantially similar information see:

# Ip -s link
1: lo: mtu16436qdisc noqueue state UNKNOWN
    link / loopback00: 00: 00: 00: 00: 00brd00: 00: 00: 00: 00: 00
    RX: bytes packets errors dropped overrun mcast
    2255610398556534 0000
    TX: bytes packets errors dropped carrier collsns
    2255610398556534 0000
2: eth0: mtu1500qdisc pfifo_fast state UP qlen1000
    link / ether00: 19: bb: 5b: 07: 34brd ff: ff: ff: ff: ff: ff
    RX: bytes packets errors dropped overrun mcast
    32683320875724229790 0016733497
    TX: bytes packets errors dropped carrier collsns
    2604833405168312850 000

"Netstat -s" provides statistical information under each protocol, some statistics such as retransmit is useful only "netstat -s" can be seen:

# Netstat -s
 
...
 
Tcp:
    71479active connections openings
    7181passive connection openings
    13723failed connection attempts
    407connection resets received
    1connections established
    18969163segments received
    11210435segments send out
    85883segments retransmited
    0bad segments received.
    80162resets sent
...
475fast retransmits
30forward retransmits
110retransmits inslow start
22772other TCP timeouts
5sack retransmits failed
...
     
         
         
         
  More:      
 
- Java regular expression syntax (Programming)
- How to install Gnome 3.10 in Ubuntu 13.10 (Linux)
- Grep, Ack, Ag searches Efficiency Comparison (Linux)
- Let your PHP 7 faster (GCC PGO) (Linux)
- Python Dir find a folder several files (Programming)
- About Auto Layout and frame (Programming)
- The Java development environment to build under Ubuntu 14.04 (Linux)
- Oracle Sql Loader tool has shown signs (Database)
- Du and df show disk space usage inconsistent Causes and Treatment (Linux)
- Linux crontab commands and detailed usage examples (Linux)
- Android HTTP request with Get Information (Programming)
- VMware virtual machines to install virt-manager unable to connect to libvirt's approach (Linux)
- Linux Workstation Security Checklist - from the Linux Foundation Internal (Linux)
- Linux dd command make U disk boot disk (Linux)
- MySQL 5.6 use GTIDs build the master database (Database)
- GoldenGate for Oracle data consistency initializing (Database)
- Ant command-line compiler Android project (Programming)
- What is a logical partition management LVM, how to use in Ubuntu (Linux)
- According to the national position on how to block traffic in Linux (Server)
- Ubuntu install perfectly handsome terminal Guake 0.8.1 (Linux)
     
           
     
  CopyRight 2002-2022 newfreesoft.com, All Rights Reserved.