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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: New Denial of Service Attack on Panix
Tim Bass writes: > > Thanks for pointing out that the UNREACHABLE could just > be hosts that are turned off. The difficult case, > now that you mention it, are the UNREACHABLEs due > to a route flap or other intermediate system blip. A host being down is _not_ necessarily an UNREACHABLE host. In most cases you won't see _anything at all_ if a host on an ethernet is down. A smart router might detect a chronically unresolved ARP and produce an ICMP_UNREACH, but do you know about routers like that? > Tim Dima - - - - - - - - - - - - - - - - -
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