NSTAT

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