Server/Client Alive mechanism issues

[Ángel González]

On 25/01/12 23:06, Gert Doering wrote:
> Hi,
>
> On Wed, Jan 25, 2012 at 12:26:34PM -0500, Jeff Mitchell wrote:
>> My understanding is that since the alive mechanism is running inside the
>> encrypted connection, OpenSSH would be able to (and would) prioritize
>> the alive packets over other data. So if any data is able to get through
>> (and it does) the alive packets should be able to as well. But this
>> doesn't seem to be the case.
> For that, OpenSSH would need to know that there is congestion, and
> throttle it's send rate to avoid buffers building up *elsewhere*.
>
> If there is 10 seconds worth of data in your DSL router, there is nothing
> OpenSSH can do to achieve a round-trip time of 1s for it's keepalives.
>
> gert
Note that if you know the real bandwidth, you could use the --bwlimit 
parameter
of rsync a little below that to not saturate it.