Hi Anuz, I have google before, but without success. This file don't seems to contain the timeouts. I have been searching for the timeouts of TCP connections for my monograph and I have found the following struct in file net/netfilter/nf_conntrack_proto_tcp.c: 73 static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = { 74 [TCP_CONNTRACK_SYN_SENT] = 2 MINS, 75 [TCP_CONNTRACK_SYN_RECV] = 60 SECS, 76 [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, 77 [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, 78 [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, 79 [TCP_CONNTRACK_LAST_ACK] = 30 SECS, 80 [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, 81 [TCP_CONNTRACK_CLOSE] = 10 SECS, 82 [TCP_CONNTRACK_SYN_SENT2] = 2 MINS, 83 }; So I don't understood it well. I need to know: (a) in how much time I need to receive an ACK after I send an SYN; (b) how much time the connection is closed if any packet is send by a node. Maybe there are a documentation about these constants? Thank very much! On Thu, Apr 19, 2012 at 12:30 PM, Anuz Pratap Singh Tomar <chambilkethakur@gmail.com> wrote:

On Thu, Apr 19, 2012 at 2:49 PM, Chir0n <io.chir0n@gmail.com> wrote:

...

Hello,

Can someone tell me where I can find out the code snippet that has the 3 way handshake values?

after doing a bit of googling, you can easily reach to this location: http://lxr.linux.no/#linux+v3.3.2/net/ipv4/tcp_input.c#L5801

This is where state machine is implemented for TCP.

...

Best regards,

Chiron

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