Linux Linux Network Statistics Tools / Commands

Linux Network Statistics Tools / Commands

How do I find out the current network interface throughput statistics on Linux (CentOS or Debian based distro)? How do I see current kernel snmp counters and network interface statistics on Linux operating systems?

Tutorial details
Difficulty Easy (rss)
Root privileges No
Requirements None
Time N/A
You can use any one of the following commands:

 

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nstat command : Network Statistics Tool

Type the following command:
# nstat
Sample outputs:

#kernel
IpInReceives                    133243             0.0
IpInDelivers                    133243             0.0
IpOutRequests                   92904              0.0
IcmpOutErrors                   97                 0.0
IcmpOutTimeExcds                97                 0.0
IcmpMsgOutType3                 97                 0.0
TcpActiveOpens                  538                0.0
TcpEstabResets                  56                 0.0
TcpInSegs                       129837             0.0
TcpOutSegs                      89720              0.0
TcpRetransSegs                  42                 0.0
TcpOutRsts                      704                0.0
UdpInDatagrams                  3255               0.0
UdpNoPorts                      97                 0.0
UdpOutDatagrams                 3270               0.0
Ip6OutNoRoutes                  206                0.0
TcpExtTW                        141                0.0
TcpExtDelayedACKs               508                0.0
TcpExtDelayedACKLocked          1                  0.0
TcpExtDelayedACKLost            42                 0.0
TcpExtTCPHPHits                 117659             0.0
TcpExtTCPPureAcks               2158               0.0
TcpExtTCPHPAcks                 605                0.0
TcpExtTCPSackRecovery           1                  0.0
TcpExtTCPLossUndo               16                 0.0
TcpExtTCPSackFailures           4                  0.0
TcpExtTCPFastRetrans            1                  0.0
TcpExtTCPSlowStartRetrans       3                  0.0
TcpExtTCPTimeouts               33                 0.0
TcpExtTCPDSACKOldSent           40                 0.0
TcpExtTCPDSACKRecv              5                  0.0
TcpExtTCPAbortOnData            120                0.0
TcpExtTCPAbortOnClose           55                 0.0
TcpExtTCPSackShiftFallback      9                  0.0
IpExtInOctets                   180131682          0.0
IpExtOutOctets                  7289106            0.0

ss command : Utility To Investigate Sockets

To see summary of stats, enter:
# ss -s
Sample outputs:

Total: 786 (kernel 804)
TCP:   65 (estab 40, closed 7, orphaned 0, synrecv 0, timewait 6/0), ports 56

Transport Total     IP        IPv6
*	  804       -         -        
RAW	  1         1         0        
UDP	  12        9         3        
TCP	  58        52        6        
INET	  71        62        9        
FRAG	  0         0         0        

See ss command tutorial for more information.

netstat command : The Old Good Utility To Show Sockets

To see a table of all network interfaces and its summary, enter:
# netstat -i
Sample outputs:

Kernel Interface table
Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0       1500 0    941022      0      0 0        688165      0      0      0 BMRU
lo        16436 0      9304      0      0 0          9304      0      0      0 LRU
ppp0       1496 0      3784      0      0 0          4177      0      0      0 MOPRU

To see summary statistics for each protocol, enter:
# netstat -s
Sample outputs:

Ip:
    1092065 total packets received
    0 forwarded
    0 incoming packets discarded
    1091681 incoming packets delivered
    798913 requests sent out
    895 dropped because of missing route
    759 reassemblies required
    375 packets reassembled ok
Icmp:
    17 ICMP messages received
    0 input ICMP message failed.
    ICMP input histogram:
        timeout in transit: 8
        echo replies: 9
    1747 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 1730
        echo request: 17
IcmpMsg:
        InType0: 9
        InType11: 8
        OutType3: 1730
        OutType8: 17
Tcp:
    4822 active connections openings
    1129 passive connection openings
    457 failed connection attempts
    165 connection resets received
    7 connections established
    1062519 segments received
    771394 segments send out
    7158 segments retransmited
    6 bad segments received.
    2578 resets sent
Udp:
    20846 packets received
    1730 packets to unknown port received.
    0 packet receive errors
    19242 packets sent
UdpLite:
TcpExt:
    71 invalid SYN cookies received
    8 resets received for embryonic SYN_RECV sockets
    142 packets pruned from receive queue because of socket buffer overrun
    2109 TCP sockets finished time wait in fast timer
    84 packets rejects in established connections because of timestamp
    19454 delayed acks sent
    6 delayed acks further delayed because of locked socket
    Quick ack mode was activated 7306 times
    1 packets directly queued to recvmsg prequeue.
    1 bytes directly received in process context from prequeue
    823921 packet headers predicted
    24412 acknowledgments not containing data payload received
    10150 predicted acknowledgments
    242 times recovered from packet loss by selective acknowledgements
    33 congestion windows recovered without slow start by DSACK
    335 congestion windows recovered without slow start after partial ack
    336 TCP data loss events
    TCPLostRetransmit: 35
    1 timeouts after reno fast retransmit
    156 timeouts after SACK recovery
    116 timeouts in loss state
    461 fast retransmits
    5 forward retransmits
    608 retransmits in slow start
    2073 other TCP timeouts
    62 SACK retransmits failed
    43074 packets collapsed in receive queue due to low socket buffer
    8499 DSACKs sent for old packets
    101 DSACKs sent for out of order packets
    308 DSACKs received
    9 DSACKs for out of order packets received
    427 connections reset due to unexpected data
    122 connections reset due to early user close
    28 connections aborted due to timeout
    TCPDSACKIgnoredOld: 3
    TCPDSACKIgnoredNoUndo: 60
    TCPSpuriousRTOs: 4
    TCPSackShifted: 282
    TCPSackMerged: 740
    TCPSackShiftFallback: 1017
IpExt:
    InMcastPkts: 47
    OutMcastPkts: 51
    InBcastPkts: 1
    InOctets: 1341508973
    OutOctets: 72525352
    InMcastOctets: 8649
    OutMcastOctets: 7519
    InBcastOctets: 328

See netstat command tutorial for more information.

ip / ifconfig command : Configure or Show a Network Interface Info

Type the following command:
# ifconfig
OR
# /sbin/ifconfig
OR
# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr b8:ac:6f:65:31:e5  
          inet addr:192.168.1.5  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::baac:6fff:fe65:31e5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:966334 errors:0 dropped:0 overruns:0 frame:0
          TX packets:703297 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1186255648 (1.1 GiB)  TX bytes:73968238 (70.5 MiB)
          Interrupt:17 

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:16436  Metric:1
          RX packets:9666 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9666 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1399578 (1.3 MiB)  TX bytes:1399578 (1.3 MiB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.1.11.70  P-t-P:10.0.31.18  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1496  Metric:1
          RX packets:3784 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4177 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:2400265 (2.2 MiB)  TX bytes:275983 (269.5 KiB)

To display network interface statistics, enter:
# ip -s link
Sample outputs:

1: lo: <loopback,up,lower_up style="margin: 0px; padding: 0px; overflow-wrap: break-word;"> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    RX: bytes  packets  errors  dropped overrun mcast   
    1444187    9960     0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    1444187    9960     0       0       0       0      
2: eth0: <broadcast,multicast,up,lower_up style="margin: 0px; padding: 0px; overflow-wrap: break-word;"> mtu 1500 qdisc mq state UP qlen 1000
    link/ether b8:ac:6f:65:31:e5 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast   
    1221956483 991501   0       0       0       24     
    TX: bytes  packets  errors  dropped carrier collsns 
    75623937   720272   0       0       0       0      
3: wlan0: <broadcast,multicast style="margin: 0px; padding: 0px; overflow-wrap: break-word;"> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:21:6a:ca:9b:10 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast   
    0          0        0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    0          0        0       0       0       0      
4: pan0: <broadcast,multicast style="margin: 0px; padding: 0px; overflow-wrap: break-word;"> mtu 1500 qdisc noop state DOWN 
    link/ether 4a:c7:5f:0e:8e:d8 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast   
    0          0        0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    0          0        0       0       0       0      
8: ppp0: <pointopoint,multicast,noarp,up,lower_up style="margin: 0px; padding: 0px; overflow-wrap: break-word;"> mtu 1496 qdisc pfifo_fast state UNKNOWN qlen 3
    link/ppp 
    RX: bytes  packets  errors  dropped overrun mcast   
    2419881    3848     0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    284151     4287     0       0       0       0      

sar command: Display Network Stats

Type the following command (you need to install and enable sar via sysstat package):
sar -n DEV

Linux 2.6.32-220.2.1.el6.x86_64 (www.cyberciti.biz)    Tuesday 13 March 2012   _x86_64_        (2 CPU)

12:00:01  CDT     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
12:10:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
12:10:01  CDT      eth0    127.13    121.32     95.45     18.34      0.00      0.00      0.00
12:10:01  CDT      eth1     98.48    110.62     16.72     96.33      0.00      0.00      0.00
12:20:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
12:20:01  CDT      eth0    139.95    133.41    106.30     19.95      0.00      0.00      0.00
12:20:01  CDT      eth1    110.65    121.85     18.14    107.13      0.00      0.00      0.00
12:30:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
12:30:01  CDT      eth0    147.85    132.49    115.78     20.45      0.00      0.00      0.00
12:30:01  CDT      eth1    111.88    127.39     18.61    117.65      0.00      0.00      0.00
12:40:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
12:40:01  CDT      eth0    136.75    124.64    105.24     19.48      0.00      0.00      0.00
12:40:01  CDT      eth1    101.65    115.32     17.58    104.50      0.00      0.00      0.00
12:50:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
12:50:01  CDT      eth0    131.45    125.69     96.49     19.58      0.00      0.00      0.00
12:50:01  CDT      eth1    101.41    111.31     17.54     96.78      0.00      0.00      0.00
01:00:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:00:01  CDT      eth0    140.30    133.27    102.17     20.75      0.00      0.00      0.00
01:00:01  CDT      eth1    106.90    119.51     18.53    103.09      0.00      0.00      0.00
01:10:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:10:01  CDT      eth0    152.03    127.74    125.56     19.85      0.00      0.00      0.00
01:10:01  CDT      eth1    115.60    134.57     18.73    126.96      0.00      0.00      0.00
01:20:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:20:01  CDT      eth0    138.55    130.55    103.03     20.20      0.00      0.00      0.00

....
..
....
..
.

01:00:01  CDT      eth1    156.82    169.48     28.83    138.49      0.00      0.00      0.00
01:10:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:10:01  CDT      eth0    215.19    194.82    163.11     30.99      0.00      0.00      0.00
01:10:01  CDT      eth1    162.49    183.79     28.36    163.70      0.00      0.00      0.00
01:20:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:20:01  CDT      eth0    200.20    192.23    140.64     30.93      0.00      0.00      0.00
01:20:01  CDT      eth1    153.60    166.96     27.32    140.26      0.00      0.00      0.00
01:30:01  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:30:01  CDT      eth0    111.98    103.58     79.12     16.52      0.00      0.00      0.48
01:30:01  CDT      eth1     87.50     95.58     14.74     79.35      0.00      0.00      0.00

Average:        IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
Average:           lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
Average:         eth0    211.21    196.20    156.18     31.20      0.00      0.00      0.01
Average:         eth1    159.10    174.52     28.00    149.95      0.00      0.00      0.00

Or type the following command:
# sar -n DEV 1 3
Sample outputs:

Linux 2.6.32-220.2.1.el6.x86_64 (www.cyberciti.biz)    Tuesday 13 March 2012   _x86_64_        (2 CPU)

01:44:03  CDT     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
01:44:04  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:44:04  CDT      eth0    161.70    154.26    105.20     26.63      0.00      0.00      0.00
01:44:04  CDT      eth1    145.74    142.55     25.11    144.94      0.00      0.00      0.00

01:44:04  CDT     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
01:44:05  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:44:05  CDT      eth0    162.14    156.31    107.46     42.18      0.00      0.00      0.00
01:44:05  CDT      eth1    135.92    138.83     39.38    104.92      0.00      0.00      0.00

01:44:05  CDT     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
01:44:06  CDT        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
01:44:06  CDT      eth0    303.92    293.14    272.91     37.40      0.00      0.00      0.00
01:44:06  CDT      eth1    252.94    290.20     34.87    263.50      0.00      0.00      0.00

Average:        IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
Average:           lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00
Average:         eth0    210.37    202.34    163.19     35.66      0.00      0.00      0.00
Average:         eth1    178.93    191.64     33.36    171.60      0.00      0.00      0.00
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