Simply use netstat -s:
# netstat -s | less
# netstat -t -s | less
# netstat -u -s | less
# netstat -w -s | less
# netstat -s
Output:
Ip: 88354557 total packets received 0 forwarded 0 incoming packets discarded 88104061 incoming packets delivered 96037391 requests sent out 13 outgoing packets dropped 66 fragments dropped after timeout 295 reassemblies required 106 packets reassembled ok 66 packet reassembles failed 34 fragments failed Icmp: 18108 ICMP messages received 58 input ICMP message failed. ICMP input histogram: destination unreachable: 7173 timeout in transit: 472 redirects: 353 echo requests: 10096 28977 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 18881 echo replies: 10096 Tcp: 1202226 active connections openings 2706802 passive connection openings 7394 failed connection attempts 47018 connection resets received 23 connections established 87975383 segments received 95235730 segments send out 681174 segments retransmited 2044 bad segments received. 80805 resets sent Udp: 92689 packets received 14611 packets to unknown port received. 0 packet receive errors 96755 packets sent TcpExt: 48452 invalid SYN cookies received 7357 resets received for embryonic SYN_RECV sockets 43 ICMP packets dropped because they were out-of-window 5 ICMP packets dropped because socket was locked 2672073 TCP sockets finished time wait in fast timer 441 time wait sockets recycled by time stamp 368562 delayed acks sent 430 delayed acks further delayed because of locked socket Quick ack mode was activated 36127 times 32318597 packets directly queued to recvmsg prequeue. 741479256 packets directly received from backlog 1502338990 packets directly received from prequeue 18343750 packets header predicted 10220683 packets header predicted and directly queued to user 17516622 acknowledgments not containing data received 36549771 predicted acknowledgments 102672 times recovered from packet loss due to fast retransmit Detected reordering 1596 times using reno fast retransmit Detected reordering 1 times using time stamp 8 congestion windows fully recovered 32 congestion windows partially recovered using Hoe heuristic 19 congestion windows recovered after partial ack 0 TCP data loss events 39951 timeouts after reno fast retransmit 29653 timeouts in loss state 197005 fast retransmits 186937 retransmits in slow start 131433 other TCP timeouts TCPRenoRecoveryFail: 20217 147 times receiver scheduled too late for direct processing 29010 connections reset due to unexpected data 365 connections reset due to early user close 6979 connections aborted due to timeout
ref : http://www.cyberciti.biz/tips/netstat-command-tutorial-examples.html