OT: ISPs that drop connections

[Fairlight]

On Fri, May 29, 2015 at 03:08:58PM -0700, Bob Rasmussen via Filepro-list thus spoke:
> On it becoming more of a problem recently: this reminded me that
> sometimes SSHD renegotiates key exchange after some limit such as 1
> gigabyte. I recently added support for that. But it's hard to hit a
> gig during interactive operation.

The thing about SSH is that it's incredibly sensitive.  You can have an
entirely static route, for instance...static public IP#, unchanging route,
etc.  Now, if you are working with, say, DSL, let's say they take down the
underlying link at certain times.  My ISP and AT&T would do this at the
Razorback routers.  There was a timeout so that, should you not pay your
bill, you weren't infinitely connected.  Well, it's -supposed- to be
transparent.  To most things, it -is- totally transparent.  Same route,
same MACs, same everything except the DHCP lease...but same IP#.

But SSH would drop PuTTY like a stone, even though the route is identical
when it "came back".  (It never really vanished, at the TCP/IP level...it
was a level under that, but I make not pretense of being a hardcore network
engineer, and I've forgotten exactly what would briefly refresh itself.)
It's a security measure, so nothing can spoof being the system which was
just connected.

It's basically a PITA by design.

mark->
-- 
Audio panton, cogito singularis.