在TIME_WAIT状态下在套接字上接收数据

Question

What happens, in below scenarios, when a socket in TIME_WAIT receives a segment

• a) When it receives lost ACK
• b) When sending node wants to establish another new connection using same src_ip:src_port on the server to same dst_ip:dst_port for which the server already has a TIME_WAIT socket.

Will it ignore/drop it, sends a reset or reuse the TIME_WAIT socket?

Thanks

M

Answer 1

a) When it receives lost ACK

Nothing.

b) When sending node wants to establish another new connection using same src_ip:src_port on the server to same dst_ip:dst_port for which the server already has a TIME_WAIT socket.

Nothing.

Neither of these cases corresponds to your title.

Answer 2

OK After digging a bit more and reading the book [page 43] 'Unix Network Programming' I finally figured out what was wrong with my question (answering my own question).

a) The 'Active-Closer', while in TIME_WAIT state, will re-send ACK to a lost/wandering FIN (It is not expecting any ACK at this state [link] http://upload.wikimedia.org/wikipedia/commons/5/55/TCP_CLOSE.svg )

b) TCP will not initiate a new incarnation of a connection that is in TIME_WAIT state. (I still don't know how it prevents it, ie does it reset that connection, how can we figure this from reading tcpdump)