[Standards-JIG] Re: The Ack Hack.

Trejkaz trejkaz at trypticon.org
Thu May 11 13:36:29 UTC 2006


On Thursday 11 May 2006 15:47, Tony Finch wrote:
> On Thu, 11 May 2006, Trejkaz wrote:
> > This doesn't necessarily give fast disconnection at all.  When I'm at
> > work connected through an SSH tunnel, if the SSH connection drops out,
> > the SSH client keeps the socket open and it takes quite some time for
> > *any* Jabber client to notice that it's been disconnected.
>
> In that case you want the ssh equivalent of whitespace pings. See the
> ssh_config man page and look for ServerAliveInteval. In effect you need to
> do lssage detection at every level.

Nope.

The connection is already severed -- the server knows it and the client knows 
it.  However, the SSH client (PuTTY) keeps the ports open on the client until 
you close the window.  All data sent during that time period goes into the 
black hole.

TX

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