I remember there was a patch or request posted here to force TCP
connections to retransmit/denagle/whatever right away when a dialup
connection is restablished.

Right now I have a dialup connection which drops after 2 minutes if I'm
lucky, less if I'm not.  This happens right in the middle of typing.  It
takes about 2 minutes to restablish the link (callback service).

In that time, because I've typed stuff, TCP backs off to some long time.
As you can imagine, the chance of TCP's retransmits actually happening
during the window of opportunity aren't good and they get progressively
worse.

The effect is that if the dialup connection goes down when I type
something, the connection is effectively stuck permanently.

So I would very much like the patch to kick TCP connections into
retransmitting immediately when a dialup route is restored.

I'd be just as pleased if typing a character caused the immediate
retransmit.  I don't see a global tcp_nonagle in /proc/sys/net/ipv4;
would that help?  Changing the applications is not an option.

Can anyone help?

thanks,
-- Jamie

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