dup loop

dup killer | = D = | dusty deck

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.

dup killer | = D = | dusty deck