# netstat -s | grep retransmitted
     368644 segments retransmitted

# netstat -s | grep segments
         149840 segments received
         150373 segments sent out
         161 segments retransmitted
         13 bad segments received

[root@poker ~]# collectl -st
waiting for 1 second sample...
#<------------TCP------------->
#PureAcks HPAcks   Loss FTrans
        3      0      0      0
        1      0      0      0

[root@poker ~]# collectl -stn
waiting for 1 second sample...
#<----------Network----------><------------TCP------------->
#  KBIn  PktIn  KBOut  PktOut PureAcks HPAcks   Loss FTrans
      0      1      0       1        1      0      0      0
      0      1      0       1        1      0      0      0

$ /sbin/ss -ti