Re: Your post to tech-kern%netbsd.org@localhost

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Wed, Jan 07, 2009 at 01:06:20PM +0200, Mukosi Mukwevho wrote:
> Hi,
> 
> As part of my academic research, I need to be able to simulate the ealier
> version of TCP (as per RFC 793), that means running TCP stack without
> congestion control algorithms. How can I run TCP stack on NetBSD without the
> support of TCP Congestion Control Algorithms, i.e. Slow Start, Cogestion
> Avoidance, Fast Retransmit and Fast Recovery?
> 
> Also, if feasible, is it possible to recompile the kernel disabling congestion
> control? Are there specific settings to enable/disable congestion control in
> NetBSD?

Are the sysctl variables in net.inet.tcp of any use to you? e.g.

% sysctl -d net.inet.tcp.congctl.selected
net.inet.tcp.congctl.selected: Selected Congestion Control Mechanism

Cheers,

Patrick