Greetings,
When doing an active connect and assuming that SYN packets are lost. The
next retransmit timeout will trigger retransmissions of the SYN
according to this code (in tcp_timer_rexmt):
rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
Now, when doing passive connections the syncache handles sending the
SYN-ACK and assuming again the SYN-ACK is lost the next retransmit
timeout will be calculated using this code:
sc->sc_rxttime = ticks + TCPTV_RTOBASE * (tcp_backoff[sc->sc_rxmits]);
Is there a reason why FreeBSD is not using the tcp_syn_backoff array in
syncache_timeout?
Regards,
Karim.
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