well there are problems with gateways. The best thing to do is resolve them. My experience is if you resolve all your gateways you find mostly nonworking ips or duplicates, so personally I delete them because the time it takes to work with them is not worth the effort. that's just me though. ;)
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"How do you know I'm mad?" said Alice.
"You must be," said the Cat, "or you wouldn't have come here."
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