Delay in dropbear login since 0.9.31

Thomas Petazzoni thomas.petazzoni at
Fri Sep 10 08:35:58 UTC 2010

Hello Will,

On Fri, 10 Sep 2010 09:30:24 +0100
"Will Moore" <will.moore at> wrote:

> Since buildroot 2010.05 (uclibc 0.9.31) targeting i486 and building dropbear
> (0.52) I have found a several second delay (perhaps as much as 10 seconds)
> in the ssh and scp login process.  I found that if I revert to uclibc
> then this login delay disappears.  I am happy to look further into
> this to assist in finding the problem but am unsure where to start.  Some
> pointers would be much appreciated.

Peter as recently added an option to Buildroot that allows to disable
the reverse DNS queries in Dropbear, see

It might be the origin of your problem. Now, to the question of why
uClibc 0.9.31 differs from on this, I'll let the uClibc
developers answer, because I don't know.


Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.

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