What does retrans in "ss" output mean?

Solution Verified - Updated -

Issue

  • What does retrans in "ss" output mean?
  • Looking to understand some output from the ss command:
--------------------------------------------------------------------------------
  ESTAB      0      0      10.0.0.177:44444      10.0.0.180:12345  users:(("process",50309,117))
      cubic wscale:7,7 rto:204 rtt:1.875/0.75 ato:40 cwnd:10 send 61.8Mbps retrans:0/2 rcv_rtt:12 rcv_space:102112
  • What does retrans 0/2 mean? Only some lines have it some of the time when I run the command.

Environment

  • Red Hat Enterprise Linux 7
  • ss from iproute toolset
  • TCP connections

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