ping

检查网络连通

参数：

ttl值系统参考

  1. [root@riyimei ~]# ping 192.168.11.181
  2. PING 192.168.11.181 (192.168.11.181) 56(84) bytes of data.
  3. 64 bytes from 192.168.11.181: icmp_seq=1 ttl=64 time=0.014 ms
  4. 64 bytes from 192.168.11.181: icmp_seq=2 ttl=64 time=0.041 ms
  5. 64 bytes from 192.168.11.181: icmp_seq=3 ttl=64 time=0.035 ms
  6. 64 bytes from 192.168.11.181: icmp_seq=4 ttl=64 time=0.026 ms
  7. 64 bytes from 192.168.11.181: icmp_seq=5 ttl=64 time=0.018 ms
  8. 64 bytes from 192.168.11.181: icmp_seq=6 ttl=64 time=0.022 ms
  9. ^C
  10. --- 192.168.11.181 ping statistics ---
  11. 6 packets transmitted, 6 received, 0% packet loss, time 5003ms
  12. rtt min/avg/max/mdev = 0.014/0.026/0.041/0.009 ms
  13. [root@riyimei ~]#

netstat

  1. [root@riyimei ~]# netstat -rn
  2. Kernel IP routing table
  3. Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
  4. 0.0.0.0         192.168.11.1    0.0.0.0         UG        0 0          0 eth0
  5. 169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
  6. 192.168.11.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
  7. [root@riyimei ~]# netstat -an
  8. Active Internet connections (servers and established)
  9. Proto Recv-Q Send-Q Local Address           Foreign Address         State      
  10. tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
  11. tcp        0     36 192.168.11.181:22       192.168.11.1:16045      ESTABLISHED
  12. tcp6       0      0 :::33060                :::*                    LISTEN     
  13. tcp6       0      0 :::3306                 :::*                    LISTEN     
  14. tcp6       0      0 :::22                   :::*                    LISTEN     
  15. tcp6       0      0 192.168.11.181:3306     192.168.11.1:5870       ESTABLISHED
  16. tcp6       0      0 192.168.11.181:3306     192.168.11.1:13744      ESTABLISHED
  17. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9020       ESTABLISHED
  18. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9826       ESTABLISHED
  19. tcp6       0      0 192.168.11.181:3306     192.168.11.1:6235       ESTABLISHED
  20. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9126       ESTABLISHED
  21. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9821       ESTABLISHED
  22. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9778       ESTABLISHED
  23. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9085       ESTABLISHED
  24. tcp6       0      0 192.168.11.181:3306     192.168.11.1:5873       ESTABLISHED
  25. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9823       ESTABLISHED
  26. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9816       ESTABLISHED
  27. tcp6       0      0 192.168.11.181:3306     192.168.11.1:13748      ESTABLISHED
  28. tcp6       0      0 192.168.11.181:3306     192.168.11.1:5903       ESTABLISHED
  29. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9792       ESTABLISHED
  30. tcp6       0      0 192.168.11.181:3306     192.168.11.1:9824       ESTABLISHED
  31. Active UNIX domain sockets (servers and established)
  32. Proto RefCnt Flags       Type       State         I-Node   Path
  33. unix  2      [ ACC ]     STREAM     LISTENING     15103    /run/lvm/lvmetad.socket
  34. unix  2      [ ACC ]     STREAM     LISTENING     18092    /var/lib/mysql/mysql.sock
  35. unix  2      [ ACC ]     STREAM     LISTENING     17312    /var/run/mysqld/mysqlx.sock
  36. unix  2      [ ACC ]     STREAM     LISTENING     17082    /run/dbus/system_bus_socket
  37. unix  2      [ ACC ]     STREAM     LISTENING     15037    /run/systemd/private
  38. unix  2      [ ACC ]     SEQPACKET  LISTENING     15068    /run/udev/control
  39. unix  2      [ ]         DGRAM                    15070    /run/systemd/shutdownd
  40. unix  4      [ ]         DGRAM                    8673     /run/systemd/notify
  41. unix  2      [ ]         DGRAM                    8675     /run/systemd/cgroups-agent
  42. unix  2      [ ACC ]     STREAM     LISTENING     8693     /run/systemd/journal/stdout
  43. unix  2      [ ACC ]     STREAM     LISTENING     15094    /run/lvm/lvmpolld.socket
  44. unix  5      [ ]         DGRAM                    8696     /run/systemd/journal/socket
  45. unix  6      [ ]         DGRAM                    8698     /dev/log
  46. unix  3      [ ]         STREAM     CONNECTED     12477    /run/systemd/journal/stdout
  47. unix  2      [ ]         DGRAM                    19829    
  48. unix  3      [ ]         STREAM     CONNECTED     19950    
  49. unix  2      [ ]         DGRAM                    22128    
  50. unix  3      [ ]         STREAM     CONNECTED     17110    /run/systemd/journal/stdout
  51. unix  3      [ ]         STREAM     CONNECTED     19692    
  52. unix  2      [ ]         DGRAM                    19816    
  53. unix  3      [ ]         STREAM     CONNECTED     17201    /run/systemd/journal/stdout
  54. unix  3      [ ]         STREAM     CONNECTED     19768    
  55. unix  3      [ ]         STREAM     CONNECTED     19815    
  56. unix  3      [ ]         STREAM     CONNECTED     19823    
  57. unix  3      [ ]         STREAM     CONNECTED     15652    
  58. unix  3      [ ]         STREAM     CONNECTED     17124    /run/systemd/journal/stdout
  59. unix  3      [ ]         STREAM     CONNECTED     17133    /run/systemd/journal/stdout
  60. unix  2      [ ]         DGRAM                    824      
  61. unix  3      [ ]         STREAM     CONNECTED     18573    /run/dbus/system_bus_socket
  62. unix  2      [ ]         DGRAM                    840      
  63. unix  3      [ ]         STREAM     CONNECTED     17301    
  64. unix  3      [ ]         STREAM     CONNECTED     19818    /run/dbus/system_bus_socket
  65. unix  3      [ ]         STREAM     CONNECTED     17108    /run/systemd/journal/stdout
  66. unix  3      [ ]         STREAM     CONNECTED     17739    
  67. unix  2      [ ]         DGRAM                    17794    
  68. unix  3      [ ]         STREAM     CONNECTED     16960    
  69. unix  3      [ ]         STREAM     CONNECTED     19650    
  70. unix  3      [ ]         STREAM     CONNECTED     13246    /run/systemd/journal/stdout
  71. unix  3      [ ]         STREAM     CONNECTED     18572    
  72. unix  2      [ ]         DGRAM                    15538    
  73. unix  3      [ ]         STREAM     CONNECTED     20049    
  74. unix  3      [ ]         STREAM     CONNECTED     17930    /run/systemd/journal/stdout
  75. unix  2      [ ]         DGRAM                    18898    
  76. unix  3      [ ]         STREAM     CONNECTED     17123    /run/dbus/system_bus_socket
  77. unix  2      [ ]         DGRAM                    17294    
  78. unix  3      [ ]         STREAM     CONNECTED     17121    
  79. unix  3      [ ]         DGRAM                    15213    
  80. unix  3      [ ]         STREAM     CONNECTED     20203    /run/dbus/system_bus_socket
  81. unix  3      [ ]         STREAM     CONNECTED     17122    
  82. unix  3      [ ]         DGRAM                    15214    
  83. [root@riyimei ~]#
  1. [root@riyimei ~]# netstat -i
  2. Kernel Interface table
  3. Iface             MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
  4. eth0             1500    29184      0      0 0         25936      0      0      0 BMRU
  5. lo              65536       12      0      0 0            12      0      0      0 LRU
  6. [root@riyimei ~]#