tcp - Is there a timeout at SYN_RCVD state on Linux? -



tcp - Is there a timeout at SYN_RCVD state on Linux? -

as long know, when connection request syn segment arrives, tcp response syn&ack segment , mark connection incomplete(syn_rcvd) , set incomplete queue, waiting ack finish connection.

but think won't remain in queue, there timeout on it?

on ubuntu system:

# cat /proc/sys/net/ipv4/tcp_synack_retries 5

a tcp_synack_retries variable responsible controlling number of retransmissions in linux operating system. default value set 5 linux operating systems, causes half-open connection removed after 3 minutes. in below table there calculations other values.

value time of retransmission total time maintain half-open connections in backlog queue 1 in 3rd sec 9 seconds 2 in 3rd , 9th sec 21 seconds 3 in 3rd , 9th , 21st sec 45 seconds

tcp

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