In the last episode (Jul 18), Benjamin Franks said:
> When I attempt to make a sock_stream connection to an IP, and DON'T
> receive an ACK or RST response, it seems that the system retries a finite
> number of times by sending additional SYN packets. There also looks to be
> a 3 or 6 second delay between SYN retries. After four or five, the
> connection fails.
The delays are stored in /sys/netinet/tcp_timer.c, tcp_syn_backoff[].
Those numbers are multiplied by 3 ( TCPTV_RTOBASE - the default
retransmit timeout) to get the 3, 3, 3, 3, 3, 6, 12, 24 delays you are
seeing.
> Is there a way I can change the interval time for SYN retries, or
> decrease the number of times it retries? I would imagine this would
> be dependent on the particular tcp/ip stack implementation of my OS.
> I'm using FreeBSD and would imaging some kernel sysctl variable would
> control this... Any ideas? Or perhaps it's a socket option?
You'll have to twiddle those numbers and rebuild the kernel.
--
Dan Nelson
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