How to deal with changing IP?

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Joined: 2008-10-07 06:25
First name: Daniel
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Location: Zurich, Switzerland

How to deal with changing IP?

#1 Post by phasemaster » 2008-10-07 06:43

I am trying to do a file transfer between two DSL connections that takes multiple days. One DSL connection has the peculiarity that its IP address changes every night. This leads to a discontinuation of the file transfer for which I have found no clean solution yet (other than making the timeout ridiculously short). Am I overlooking something? Is there a best practice to deal with such a situation?

This sequence of events is as follows:
  • Start file transfer A to B appending a file at B
  • At night, the IP of A changes so that A will reconnect to B after a short time with a new IP; at this time, B shows two connections to A, one with the old IP address an one with the new IP address
  • A will try to restart the file transfer, which fails (550 can't access file), because the old connection still has write access to the file
  • after some failed tries (over a few seconds), A will give up initiating a transfer
  • after the connection timeout, the old connection will terminate
  • after the connection timeout, the new connection will terminate

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