You might also want to check out the vpn list, at <URL:http://lists.shmoo.com/mailman/listinfo/vpn>.
As others mentioned, it should be doable, and an ip registry service that lets you give yourself a stable hostname is probably going to be the key to making any solution work. If you have negligible performance needs, and really good internet connectivity, ppp+ssh can work. But if there's any change you might want to get good performance, that remains [nearly] as good as the underlying internet connectivity even when that connectivity isn't perfect, don't spend time on ppp+ssh; the CIPE project authors explain why at <URL:http://sites.inka.de/~bigred/devel/tcp-tcp.html>. Which brings up another possibility, for simple RedHat 7.3 <-> RedHat 7.3 connectivity, you might find CIPE <URL:http://sites.inka.de/~bigred/devel/cipe.html> easier to use; it's designed for this kind of job, and is preposterously much simpler than IPSec (e.g. FreeS/WAN) since IPSec was designed for every job that anybody in the universe could dream up. And CIPE is included with Red Hat 7.3. -Bennett
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