Re: [ECOS] FreeBSD TCP/IP stack and sysctl

[Matt Jerdonek <maj1224 at yahoo dot com>]

You can look at the sysctl test
(packages/net/bsd_tcpip/current/tests/sysctl1.c).  Or,
here's an example of turning off rfc1323 support using
sysctlbyname

int OldValue;
	int NewValue;
	size_t OldValueLength = sizeof(int);
	// Turn off RFC1323 support
	NewValue = 0;     // Disable
	sysctlbyname("net.inet.tcp.rfc1323", &OldValue,
&OldValueLength, &NewValue, sizeof(int));


--- "Doyle, Patrick" <WPD@dtccom.com> wrote:

> Can anybody point me at an example of using the
> 'sysctl()' API of the
> FreeBSD stack to adjust TCP parameters? 
> Specifically, I would like to
> shorten the retransmit timeout and lengthen the ACK
> timeout.  (This is on a
> dedicated PPP link between two devices).  I poked
> around a little bit and
> see that I can change the retransmit timeout -- I
> haven't looked for how to
> change the ACK timeout (if it is even possible).  I
> just don't know where to
> start with the 'sysctl()' function, having never
> used it before.  If worse
> comes to worse, I'll just change the variable
> manually outside of the
> sysctl() mechanism, but I figured I would start by
> at least pretending to
> follow the rules :-)
> 
> All pointers will be gratefully accepted...
> 
> --wpd
> 
> 
> Patrick Doyle
> DSP Design Engineer
> (603) 546-2179
> 
>  
> 
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