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diff --git a/mbone/mdd/DESCR b/mbone/mdd/DESCR
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+++ b/mbone/mdd/DESCR
@@ -4,3 +4,9 @@ image on all the workstations of a computer room at the same time.
The protocol used is rather simple and will not make any effort to avoid
flooding your network. IGMP-snooping enabled switches are advised.
+
+WARNING: this tool is designed to operate on a private LAN where no
+congestion occurs. It has no rate limiting feature, which makes it
+unsuitable for use on the Internet. Do not try to use it outside of
+a private LAN, it will attempt to eat all your bandwidth to flood the
+multicast group you send data to.