It is also useful to configure mutiple IPs on the same interface, one for Colo, and one for your lab. You can do this on all OSes, even on windows.
And if you failed to do this and all advices in the article: then kindly ask colo provider to attach ip-KVM (if your "server" is not actual server with ipmi/bmc), 99.9% of places have these. And most of them will provide it free of charge for limited amount of time.
And if you failed to do this and all advices in the article: then kindly ask colo provider to attach ip-KVM (if your "server" is not actual server with ipmi/bmc), 99.9% of places have these. And most of them will provide it free of charge for limited amount of time.