msg-type:       RELAY-REPL
   hop-count:      1
   link-address:   0
   peer-address:   A
   Relay Message option containing the following:
      msg-type:     RELAY-REPL
      hop-count:    0
      link-address: address from link to which C is attached
      peer-address: C
      Relay Message option: <response from server>