anchor.diff:      ok = inet:setopts(S, [{sndbuf,Sndbuf}]),
       ok = inet:setopts(S, [{recbuf,Recbuf}]),
       case inet:getopts(S, [sndbuf]) of
  -	{ok,[{sndbuf,SB}]} when SB >= Sndbuf -> ok
  +	{ok, [{sndbuf,SB}]} when SB >= Sndbuf -> ok
       end,
       case inet:getopts(S, [recbuf]) of
   	{ok, [{recbuf, RB}]} when (RB >= Recbuf) -> ok
  
positive.code:     ?P("make (server) listen socket"),
      ok = gen_sctp:listen(S1, true),
      P1 = log_ok(inet:port(S1)),
      ?P("try create socket"),
      S2 = log_ok(gen_sctp:open(0, [inet6])),
      P2 = log_ok(inet:port(S2)),
      ?P("try connect"
  
negative.code:             end, Addr, P1]),
      #sctp_assoc_change{state = comm_up} =
  	log_ok(gen_sctp:connect(S2, Addr, P1, [])),
      ?P("connect success: await events"),
      implicit_inet6_await_ac_comm_up(S1, Addr, P2),
      %% case recv_event(log_ok(gen_sctp:recv(S1))) of
      %%     {Addr, P2, #sctp_assoc_change{state = comm_up}} ->
  