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dup loop
dup loop /d[y]oop loop/ (also `dupe loop') /n./ [FidoNet]
An infinite stream of duplicated, near-identical messages on a
FidoNet echo, the only difference being unique or mangled
identification information applied by a faulty or incorrectly
configured system or network gateway, thus rendering dup
killers ineffective. If such a duplicate message eventually
reaches a system through which it has already passed (with the
original identification information), all systems passed on the way
back to that system are said to be involved in a dup loop.
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