> When the IP address of an interface changes, TCP connections with the
> old source address are useless. Applications are not notified of this
> and time out ordinarily, just as if nothing had happened. This is
> behaviour isn't very helpful when you have a dynamic IP and know
> you're probably not going to get the old one back. In that case, you
...
> I patched userspace ppp-2.4.0 to use this functionality. It would be
> better if SIOCKILLADDR were not used until we are sure that the new IP
> is in fact different from the old one, but pppd in demand mode would
I get the same IP about 2/3 of the time, so it is pretty important
to avoid killing connections until after the new IP is known.
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