netstat command

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Netstat Command : The netstat command is a Command Prompt command used to display very detailed information about how your computer is communicating with other computers or network devices.
Specifically, the netstat command can show details about individual network connections, overall and protocol-specific networking statistics, and much more, all of which could help troubleshoot certain kinds of networking issues.


mukhtar@mukhtar-Lenovo-B490:~$ netstat -s -p tcp -f
netstat: invalid option -- 'f'
usage: netstat [-vWeenNcCF] [<Af>] -r         netstat {-V|--version|-h|--help}
       netstat [-vWnNcaeol] [<Socket> ...]
       netstat { [-vWeenNac] -i | [-cWnNe] -M | -s }

        -r, --route              display routing table
        -i, --interfaces         display interface table
        -g, --groups             display multicast group memberships
        -s, --statistics         display networking statistics (like SNMP)
        -M, --masquerade         display masqueraded connections

        -v, --verbose            be verbose
        -W, --wide               don't truncate IP addresses
        -n, --numeric            don't resolve names
        --numeric-hosts          don't resolve host names
        --numeric-ports          don't resolve port names
        --numeric-users          don't resolve user names
        -N, --symbolic           resolve hardware names
        -e, --extend             display other/more information
        -p, --programs           display PID/Program name for sockets
        -c, --continuous         continuous listing

        -l, --listening          display listening server sockets
        -a, --all, --listening   display all sockets (default: connected)
        -o, --timers             display timers
        -F, --fib                display Forwarding Information Base (default)
        -C, --cache              display routing cache instead of FIB

  <Socket>={-t|--tcp} {-u|--udp} {-w|--raw} {-x|--unix} --ax25 --ipx --netrom
  <AF>=Use '-6|-4' or '-A <af>' or '--<af>'; default: inet
  List of possible address families (which support routing):
    inet (DARPA Internet) inet6 (IPv6) ax25 (AMPR AX.25)
    netrom (AMPR NET/ROM) ipx (Novell IPX) ddp (Appletalk DDP)
    x25 (CCITT X.25)

mukhtar@mukhtar-Lenovo-B490:~$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         172.16.16.1     0.0.0.0         UG        0 0          0 enp3s0
default         192.168.0.1     0.0.0.0         UG        0 0          0 wlp2s0
link-local      *               255.255.0.0     U         0 0          0 wlp2s0
172.16.0.0      *               255.255.0.0     U         0 0          0 enp3s0
192.168.0.0     *               255.255.255.0   U         0 0          0 wlp2s0
mukhtar@mukhtar-Lenovo-B490:~$ netstat -i
Kernel Interface table
Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
enp3s0     1500 0    282610      0    754 0          5994      0      0      0 BMRU
lo        65536 0      2342      0      0 0          2342      0      0      0 LRU
wlp2s0     1500 0      5563      0      0 0          4631      0      0      0 BMRU

mukhtar@mukhtar-Lenovo-B490:~$ netstat -g
IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--------------- ------ ---------------------
lo              1      all-systems.mcast.net
enp3s0          2      224.0.0.251
enp3s0          1      all-systems.mcast.net
wlp2s0          2      224.0.0.251
wlp2s0          1      all-systems.mcast.net
lo              1      ip6-allnodes
lo              1      ff01::1
enp3s0          2      ff02::fb
enp3s0          1      ff02::1:ff40:8aaf
enp3s0          1      ip6-allnodes
enp3s0          1      ff01::1
wlp2s0          2      ff02::fb
wlp2s0          1      ff02::1:ff98:b9a9
wlp2s0          1      ip6-allnodes
wlp2s0          1      ff01::1

mukhtar@mukhtar-Lenovo-B490:~$ netstat -s
Ip:
    200485 total packets received
    1678 with invalid addresses
    0 forwarded
    37 with unknown protocol
    0 incoming packets discarded
    170772 incoming packets delivered
    12785 requests sent out
    268 outgoing packets dropped
    2 dropped because of missing route
Icmp:
    813 ICMP messages received
    20 input ICMP message failed.
    ICMP input histogram:
        destination unreachable: 704
        timeout in transit: 77
        echo replies: 32
    797 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 709
        echo request: 88
IcmpMsg:
        InType0: 32
        InType3: 704
        InType11: 77
        OutType3: 709
        OutType8: 88
Tcp:
    342 active connections openings
    1 passive connection openings
    3 failed connection attempts
    87 connection resets received
    17 connections established
    8574 segments received
    7743 segments send out
    236 segments retransmited
    7 bad segments received.
    79 resets sent
Udp:
    149553 packets received
    656 packets to unknown port received.
    0 packet receive errors
    4023 packets sent
    IgnoredMulti: 46892
UdpLite:
TcpExt:
    75 TCP sockets finished time wait in fast timer
    322 delayed acks sent
    1 delayed acks further delayed because of locked socket
    Quick ack mode was activated 103 times
    31 packets directly queued to recvmsg prequeue.
    1517 bytes directly received in process context from prequeue
    5513 packet headers predicted
    3 packets header predicted and directly queued to user
    1105 acknowledgments not containing data payload received
    244 predicted acknowledgments
    7 congestion windows recovered without slow start after partial ack
    39 other TCP timeouts
    TCPLossProbes: 36
    TCPLossProbeRecovery: 1
    103 DSACKs sent for old packets
    74 connections reset due to early user close
    10 connections aborted due to timeout
    IPReversePathFilter: 3353
    TCPRcvCoalesce: 602
    TCPOFOQueue: 341
    TCPChallengeACK: 6
    TCPSYNChallenge: 7
    TCPSpuriousRtxHostQueues: 2
    TCPAutoCorking: 50
    TCPSynRetrans: 24
    TCPOrigDataSent: 1315
    TCPACKSkippedChallenge: 1
    TCPKeepAlive: 267
IpExt:
    InMcastPkts: 110590
    OutMcastPkts: 297
    InBcastPkts: 47042
    OutBcastPkts: 8
    InOctets: 36772201
    OutOctets: 1816672
    InMcastOctets: 19331339
    OutMcastOctets: 47657
    InBcastOctets: 4005758
    OutBcastOctets: 624
    InNoECTPkts: 201065
    InECT0Pkts: 8

mukhtar@mukhtar-Lenovo-B490:~$ netstat -M
netstat: no support for `ip_masquerade' on this system.
mukhtar@mukhtar-Lenovo-B490:~$ netstat -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State     
tcp        0      0 mukhtar-Lenovo-B:domain *:*                     LISTEN   
tcp        0      0 localhost:ipp           *:*                     LISTEN   
tcp6       0      0 [::]:http               [::]:*                  LISTEN   
tcp6       0      0 ip6-localhost:ipp       [::]:*                  LISTEN   
udp        0      0 *:mdns                  *:*                               
udp        0      0 *:mdns                  *:*                               
udp        0      0 *:mdns                  *:*                               
udp        0      0 *:45082                 *:*                               
udp        0      0 mukhtar-Lenovo-B:domain *:*                               
udp        0      0 *:bootpc                *:*                               
udp        0      0 *:ipp                   *:*                               
udp        0      0 *:37588                 *:*                               
udp        0      0 *:50243                 *:*                               
udp6       0      0 [::]:mdns               [::]:*                           
udp6       0      0 [::]:mdns               [::]:*                           
udp6       0      0 [::]:mdns               [::]:*                           
udp6       0      0 [::]:39048              [::]:*                           
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7         
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7         
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     28743    @/tmp/.ICE-unix/2475
unix  2      [ ACC ]     STREAM     LISTENING     27165    /run/user/1000/systemd/private
unix  2      [ ACC ]     SEQPACKET  LISTENING     14539    /run/udev/control
unix  2      [ ACC ]     STREAM     LISTENING     23418    /run/user/1000/keyring/control
unix  2      [ ACC ]     STREAM     LISTENING     22840    /tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     28744    /tmp/.ICE-unix/2475
unix  2      [ ACC ]     STREAM     LISTENING     26280    /run/user/1000/keyring/pkcs11
unix  2      [ ACC ]     STREAM     LISTENING     26282    /run/user/1000/keyring/ssh
unix  2      [ ACC ]     STREAM     LISTENING     47866    @mukhtar-com.canonical.Unity.Scope.scopes.T43203933616972
unix  2      [ ACC ]     STREAM     LISTENING     27574    /run/user/1000/pulse/native
unix  2      [ ACC ]     STREAM     LISTENING     40686    /tmp/.com.google.Chrome.gDe0Au/SingletonSocket
unix  2      [ ACC ]     STREAM     LISTENING     22839    @/tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     47865    @mukhtar-com.canonical.Unity.Scope.applications.T43203919412597
unix  2      [ ACC ]     STREAM     LISTENING     14523    /run/systemd/private
unix  2      [ ACC ]     STREAM     LISTENING     14537    /run/systemd/journal/stdout
unix  2      [ ACC ]     STREAM     LISTENING     14553    /run/systemd/fsck.progress
unix  2      [ ACC ]     STREAM     LISTENING     47063    @mukhtar-com.canonical.Unity.Scope.files.T43197782704404
unix  2      [ ACC ]     STREAM     LISTENING     20563    /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     20564    /var/run/avahi-daemon/socket
unix  2      [ ACC ]     STREAM     LISTENING     20565    /run/snapd.socket
unix  2      [ ACC ]     STREAM     LISTENING     20566    /run/snapd-snap.socket
unix  2      [ ACC ]     STREAM     LISTENING     20567    /run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     20568    /var/run/cups/cups.sock
unix  2      [ ACC ]     STREAM     LISTENING     20569    /run/uuidd/request
unix  2      [ ACC ]     STREAM     LISTENING     24492    @/tmp/dbus-JRJ6EcCaOG
unix  2      [ ACC ]     STREAM     LISTENING     23447    @/com/ubuntu/upstart-session/1000/2207
unix  2      [ ACC ]     STREAM     LISTENING     23537    /home/mukhtar/.gnupg/S.gpg-agent
unix  2      [ ACC ]     STREAM     LISTENING     47851    @mukhtar-com.canonical.Unity.Master.Scope.files.T43196890137003
unix  2      [ ACC ]     STREAM     LISTENING     23527    /var/run/NetworkManager/private-dhcp
unix  2      [ ACC ]     STREAM     LISTENING     26308    @/tmp/ibus/dbus-D3vI1Ach
unix  2      [ ACC ]     STREAM     LISTENING     47850    @mukhtar-com.canonical.Unity.Master.Scope.applications.T43196882157128
unix  2      [ ACC ]     STREAM     LISTENING     23466    @/tmp/dbus-awTkDi4hED

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