In article <local.mail.freebsd-net/[EMAIL PROTECTED]> you write:
>Hello,
>
>1. Is there any sysctl variable to control the number of
>duplicate acks after which the sending TCP gets into a fast
>retransmit mode?
No, but the current limit is in tcp_input.c:
static int tcprexmtthresh = 3;
so you can easily change this.
>2. If I have a switch that does not support any port aggregation,
>and it is connected to a BSD machine with 2 ethernet NICs that have
>identical MAC, will the switch forward *each* packet destined to the BSD
>machine to both of the NICs.
Unlikely. The switch will probably allow only one mac->port mapping.
>3. Apart from using tcpdump, are there any other tools/ways to analyze the
>dynamic behaviour of a BSD stack - like knowing when there have
>been retransmits, the state of various buffers in the stack etc.
I like tcptrace, but that is an external view. You could try turning on
the TCPDEBUG #define, although I'm not sure how useful it would be.
--
Jonathan
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