This smells like it may be a routing persistance issue rather than an error in your code. How do LWP::Simple or core Perl know internally that the active network interface and default gateway have changed mid-stream? Not that they couldn't necessarily be made to refresh - I'm just asking, eh.
One possible ( potentially hack-ish) workaround would be to automagically kill and re-launch your script using your Unix distribution's standard mechanisms. With Debian Linux that would be scriptlets added to /etc/network/if-up.d/ and if-down.d/ directories.
cheers,
ybiC
striving toward Perl Adept
(it's pronounced "why-bick")
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