Pour remettre à zéro les statistiques de 'netstat', quelques options :
-Zc : Statistiques sur Buffer cache
-Zi : Statistiques sur les interfaces
-Zm : Allocateur de mémoire.
-Zs : Protocoles.
-p tcp : Spécifie la demande pour le protocole TCP
Ainsi, on porra faire une commande de Reset des statistiques :
# netstat -Zs -Zm -Zi -Zc
Suivie d'une commande d'affichage des valeurs après cette réinitialisation :
# netstat -in
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
en0 1500 link#2 4e.cc.64.4b.28.2 15 0 7 0 0
en0 1500 10.78.16 10.78.18.100 15 0 7 0 0
en1 1500 link#3 4e.cc.64.4b.28.3 12 0 0 0 0
en1 1500 10.26.80 10.26.87.18 12 0 0 0 0
en2 1500 link#4 4e.cc.64.4b.28.4 17 0 16 0 0
en2 1500 10.41.68 10.41.68.32 17 0 16 0 0
en3 1500 link#5 4e.cc.64.4b.28.5 2 0 1 0 0
en3 1500 10.28.96 10.28.96.80 2 0 1 0 0
lo0 16896 link#1 6 0 6 0 0
# netstat -s -p tcp
tcp:
215 packets sent
215 data packets (34360 bytes)
0 data packets (0 bytes) retransmitted
0 ack-only packets (0 delayed)
0 URG only packets
0 window probe packets
0 window update packets
0 control packets
0 large sends
0 bytes sent using largesend
0 bytes is the biggest largesend
363 packets received
216 acks (for 34596 bytes)
1 duplicate ack
0 acks for unsent data
214 packets (29056 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
0 out-of-order packets (0 bytes)
0 packets (0 bytes) of data after window
0 window probes
0 window update packets
0 packets received after close
0 packets with bad hardware assisted checksum
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
0 discarded by listeners
0 discarded due to listener's queue full
145 ack packet headers correctly predicted
146 data packet headers correctly predicted
0 connection requests
0 connection accepts
0 connections established (including accepts)
0 connections closed (including 0 drops)
0 connections with ECN capability
0 times responded to ECN
0 embryonic connections dropped
215 segments updated rtt (of 213 attempts)
0 segments with congestion window reduced bit set
0 segments with congestion experienced bit set
0 resends due to path MTU discovery
0 path MTU discovery terminations due to retransmits
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 fast retransmits
0 when congestion window less than 4 segments
0 newreno retransmits
0 times avoided false fast retransmits
0 persist timeouts
0 connections dropped due to persist timeout
1 keepalive timeout
0 keepalive probes sent
0 connections dropped by keepalive
0 times SACK blocks array is extended
0 times SACK holes array is extended
0 packets dropped due to memory allocation failure
0 connections in timewait reused
0 delayed ACKs for SYN
0 delayed ACKs for FIN
0 send_and_disconnects
0 spliced connections
0 spliced connections closed
0 spliced connections reset
0 spliced connections timeout
0 spliced connections persist timeout
0 spliced connections keepalive timeout
0 TCP checksum offload disabled during retransmit
0 Connections dropped due to bad ACKs
0 Connections dropped due to duplicate SYN packets
0 fastpath loopback connections
0 fastpath loopback sent packets (0 bytes)
0 fastpath loopback received packets (0 bytes)
