Re: Checkpoint/Restart on Linux with sockets?

Ricky Beam (jfbeam@bluetopia.net)
Tue, 18 Jul 2000 19:27:04 -0400 (EDT)


On Tue, 18 Jul 2000, Frank Mehnert wrote:
>Imagine, there is executing a ftp server on a Linux box. Sometimes the
>box should be going down. How difficult would it be to implement mechanisms
>into Linux such that the ftp server could move to another machine (perhaps
>with checkpoint/restart) without cutting open connections?

Aside from the obvious problems with MAC addresses... this is not very
difficult to do. There would have to be an interface for flash starting
a socket -- the application would have to provide a _complete_ description
of the socket as there will be no standard opening sync up. I know this can
be done as I did it many years ago as a joke (back in the 0.99pl15j era. I
did it to prove how easy it is to steal a connection -- I was assuming a
telnet connection from my Mac. Ah, those were the days...)

--Ricky

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